Updated on 2024/11/19

Information

 

写真a

 
KANNO SUGUMI
 
Organization
Faculty of Science Department of Physics Associate Professor
School of Sciences Department of Physics(Concurrent)
Graduate School of Sciences Department of Physics(Concurrent)
Title
Associate Professor
Contact information
メールアドレス
Profile
I am interested in gravitational and quantum aspects of cosmology. My research is mostly focused on the early universe, especially the beginning of the universe and the origin of the large scale structure of the universe. Recently, I try to tackle with this problem by applying the development of quantum information to the Universe.
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Research Interests・Research Keywords

  • Research theme: Cosmology, Gravitation

    Keyword: The beginning of the universe

    Research period: 2021.6

Awards

  • 第8回湯浅年子賞(銀賞)

    2021.2   お茶の水女子大学  

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    この賞は、優れた原子核の実験的研究を行い国際的に活躍した女性自然科学者の湯浅年子博士を称えて設立されたもので、物理学とその関連領域分野における業績が特に顕著であり、近い将来当該分野において、国際的に活躍する女性になると認められる者を顕彰する賞である。

  • Physical Review D Editors’ Suggestion

    2021.2   アメリカ物理学会  

Papers

  • Search for high-frequency gravitational waves with Rydberg atoms

    Sugumi Kanno, Jiro Soda, Akira Taniguchi

    2023.11

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    We propose high-frequency gravitational wave (GW) detectors with Rydberg
    atoms. Rydberg atoms are sensitive detectors of electric fields. By setting up
    a constant magnetic field, a weak electric field is generated upon the arrival
    of GWs. The weak electric field signal is then detected by an
    electromagnetically induced transparency (EIT) in the system of the Rydberg
    atoms. Recently, the sensitivity of the Rydberg atoms is further improved by
    combining superheterodyne detection method. Hence, even the weak signal
    generated by the GWs turns out to be detectable. We calculate the amplitude of
    Rabi frequency of the Rydberg atoms induced by the GWs and show that the
    sensitivity of the Rydberg atoms becomes maximum when the size of the Rydberg
    atoms is close to the wavelength of GWs. As an example, we evaluate the
    sensitivity of the GW detector with Rubidium Rydberg atoms and find that the
    detector can probe GWs with a frequency 26.4 GHz and an amplitude approximately
    around $10^{20}$. We argue that the sensitivity can be further enhanced by
    exploiting entangled atoms.

  • Circularly polarized gravitational waves in Chern-Simons gravity originating from an axion domain wall Reviewed

    Sugumi Kanno, Jiro Soda, Akira Taniguchi

    Physical Review D   108 ( 8 )   2023.10

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    DOI: 10.1103/physrevd.108.083525

  • A peak in the power spectrum of primordial gravitational waves induced by primordial dark magnetic fields Reviewed

    Sugumi Kanno, Ann Mukuno, Jiro Soda, Kazushige Ueda

    Journal of Cosmology and Astroparticle Physics   2023 ( 05 )   052 - 052   2023.5

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    Abstract

    Dark gauge fields have been discussed as candidates for dark matter recently. If they existed, primordial dark magnetic fields during inflation would have existed. It is believed that primordial gravitational waves (PGWs) arise out of quantum fluctuations during inflation. We study the graviton-dark photon conversion process in the presence of background primordial dark magnetic fields and find that the process induces the tachyonic instability of the PGWs. As a consequence, a peak appears in the power spectrum of PGWs. It turns out that the peak height depends on the direction of observation. The peak frequency could be in the range from 10-5 to 103 Hertz for GUT scale inflation. Hence, the observation of PGWs could provide a new window for probing primordial dark magnetic fields.

    DOI: 10.1088/1475-7516/2023/05/052

  • Anisotropic warm inflation Reviewed

    Sugumi Kanno, Ann Mukuno, Jiro Soda, Kazushige Ueda

    Physical Review D   107 ( 6 )   2023.3

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    DOI: 10.1103/physrevd.107.063524

  • Impact of quantum entanglement induced by magnetic fields on primordial gravitational waves Reviewed

    Sugumi Kanno, Ann Mukuno, Jiro Soda, Kazushige Ueda

    Physical Review D   107 ( 6 )   2023.3

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    DOI: 10.1103/physrevd.107.063503

  • A peak in the power spectrum of primordial gravitational waves induced by primordial magnetic fields

    Sugumi Kanno, Ann Nakato, Jiro Soda, Kazushige Ueda

    2023.1

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    It has been argued that there exist extragalactic magnetic fields in the
    range from $10^{-17}$ to $10^{-9}$ Gauss with a cosmological coherence length.
    One plausible explanation for the origin of the extragalactic magnetic fields
    would be quantum fluctuations of the electromagnetic fields during inflation.
    It is also believed that primordial gravitational waves (PGWs) arise out of
    quantum fluctuations during inflation. We study the graviton-photon conversion
    process in the presence of background magnetic fields and find that the process
    induces the tachyonic instability of the PGWs. As a consequence, a peak appears
    in the power spectrum of PGWs. It turns out that the peak height depends on the
    direction of observation. The peak frequency could be in the range from
    $10^{-5}$ to $10^{3}$ Hertz for GUT scale inflation. Hence, the observation of
    PGWs could provide a new window for probing primordial magnetic fields.

  • Impact of quantum entanglement induced by magnetic fields on primordial gravitational waves

    Sugumi Kanno, Ann Nakato, Jiro Soda, Kazushige Ueda

    Physical Review D   2022.11

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    There exist observational evidence to believe the existence of primordial
    magnetic fields generated during inflation. We study primordial gravitational
    waves (PGWs) during inflation in the presence of magnetic fields sustained by a
    gauge kinetic coupling. In the model, not only gravitons as excitations of
    PGWs, but also photons as excitations of electromagnetic fields are highly
    squeezed. They become entangled with each other through graviton to photon
    conversion and vice versa. We derive the reduced density matrix for the
    gravitons and calculate their entanglement entropy. It turns out that the state
    of the gravitons is not a squeezed state but a mixed state.

    DOI: 10.1103/PhysRevD.107.063503

  • Conversion of squeezed gravitons into photons during inflation Reviewed

    Sugumi Kanno, Jiro Soda, Kazushige Ueda

    Physical Review D   106 ( 8 )   2022.10

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    DOI: 10.1103/physrevd.106.083508

  • Anisotropic warm inflation

    Sugumi Kanno, Ann Nakato, Jiro Soda, Kazushige Ueda

    2022.9

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    Anisotropic inflation is a model succeeded in explaining statistical
    anisotropy. Warm inflation is a model succeeded in providing a mechanism of
    reheating during inflation. We study anisotropic warm inflation focusing on the
    cosmic no-hair conjecture. In the anisotropic warm inflation, the condition for
    making anisotropy survived is clarified. We find exact solutions of power-law
    anisotropic warm inflation, and investigate the phase space structure of
    general solutions. It turns out that whether the anisotropy during inflation
    survives or not depends on the speed of decaying process from inflaton field
    into matter fields. If the process is very slow, the anisotropic warm inflation
    is realized. If the process is slow, the anisotropy tends to be hard to grow
    enough in the duration of inflation. If the process is rapid, no anisotropic
    inflation occurs.

    DOI: 10.1103/PhysRevD.107.063524

  • Graviton non-gaussianity in α-vacuum Reviewed

    Sugumi Kanno, Misao Sasaki

    Journal of High Energy Physics   2022 ( 8 )   2022.8

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    Abstract

    We compute the leading order non-Gaussianity, i.e., the bispectrum, of the tensor perturbation in the general α-vacuum on de Sitter space in general relativity. In addition to the well-known Bunch-Davies (BD) vacuum, there exits an infinite number of de Sitter invariant vacua represented by a real parameter α and a phase ϕ, with α = 0 being the BD vacuum. They are called α-vacua. In the standard slow-roll inflation, as de Sitter invariance no longer applies, the α-vacua lose its relevance in the rigorous sense. Nevertheless, if we assume that the parameter α is only weakly dependent on the wavenumber with an appropriate UV cutoff, we may consider pseudo-α-vacua. In the case of false vacuum inflation where the background spacetime is pure de Sitter, a non-trivial (non-BD) α-vacuum could indeed be realized. We find an intriguing result that the bispectrum may be exponentially enhanced to be detectable by observation even if the spectrum is too small to be detected.

    DOI: 10.1007/jhep08(2022)210

  • Conversion of squeezed gravitons into photons during inflation

    Sugumi Kanno, Jiro Soda, Kazushige Ueda

    2022.7

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    It is believed that relic gravitons are squeezed during inflation. If so,
    quantum noise induced by them can be significantly enhanced in current
    interferometers. However, decoherence of the gravitons during cosmic history
    may change the degree of squeezing. As a first step for analyzing the
    decoherence of the gravitons, we assume the presence of a sizable magnetic
    field at the beginning of inflation and study conversion processes of the
    squeezed gravitons into photons during inflation in the case of minimal
    coupling between gravitons and photons. We solve the dynamical evolution of a
    coupled system of gravitons and photons perturbatively and obtain squeezing
    parameters for the system numerically and analytically. It turns out that the
    gravitons are robust against the decoherence caused by the cosmological
    magnetic fields. We also find that the conversion rate of gravitons into
    photons is at a few percent at most.

  • Graviton non-gaussianity in $α$-vacuum

    Sugumi Kanno, Misao Sasaki

    2022.6

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    We compute the leading order non-Gaussianity, i.e., the bispectrum, of the
    tensor perturbation in the general $alpha$-vacuum on de Sitter space in
    general relativity. In addition to the well-known Bunch-Davies (BD) vacuum,
    there exits an infinite number of de Sitter invariant vacua represented by a
    real parameter $alpha$ and a phase $phi$, with $alpha=0$ being the BD
    vacuum. They are called $alpha$-vacua. In the standard slow-roll inflation, as
    de Sitter invariance no longer applies, the $alpha$-vacua lose its relevance
    in the rigorous sense. Nevertheless, if we assume that the parameter $alpha$
    is only weakly dependent on the wavenumber with an appropriate UV cutoff, we
    may consider pseudo-$alpha$-vacua. In the case of false vacuum inflation where
    the background spacetime is pure de Sitter, a non-trivial (non-BD)
    $alpha$-vacuum could indeed be realized. We find an intriguing result that the
    bispectrum may be exponentially enhanced to be detectable by observation even
    if the spectrum is too small to be detected.

    DOI: 10.1007/JHEP08(2022)210

  • Harvesting quantum coherence from axion dark matter Reviewed

    Sugumi Kanno, Akira Matsumura, Jiro Soda

    Modern Physics Letters A   37 ( 05 )   2022.2

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    Quantum coherence is one of the most striking features of quantum mechanics rooted in the superposition principle. Recently, it has been demonstrated that it is possible to harvest the quantum coherence from a coherent scalar field. In order to explore a new method of detecting axion dark matter, we consider a point-like Unruh–DeWitt detector coupled to the axion field and quantify a coherent measure of the detector. We show that the detector can harvest the quantum coherence from the axion dark matter. To be more precise, we consider a two-level electron system in an atom as the detector. In this case, we obtain the coherence measure [Formula: see text] where [Formula: see text] and [Formula: see text] are an observation time and the Lorentz factor. At the same time, the axion mass [Formula: see text] we can probe is determined by the energy gap of the detector.

    DOI: 10.1142/s0217732322500286

  • Squeezed quantum states of graviton and axion in the universe

    Sugumi Kanno, Jiro Soda

    2021.12

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    Particle production during cosmic expansion can be interpreted as a two-mode
    squeezing process of quantum states. The two-mode squeezed states consist of an
    infinite number of entangled particles and then enhance the nonclassicality of
    particles. There are two methods for estimating the degree of squeezing. One is
    to employ instantaneous vacuum states, and the other is to adopt adiabatic
    vacuum states. We analytically study the squeezing process of gravitons and
    axions by using the two methods. We first consider a cosmological model of
    inflation followed by instantaneous reheating leading to a radiation dominated
    era. In the case of gravitons, we find no qualitatively difference in the
    squeezing between the two methods. However, for the axions, it turns out that
    the squeezing in the instantaneous vacuum increases as the mass increases while
    the squeezing decreases in the adiabatic vacuum as the mass increases. We then
    study the effect of non-instantaneous reheating on the the squeezing and show
    that the squeezing is enhanced compared with the instantaneous reheating. We
    also illustrate how the squeezed states enhance the violation of Bell
    inequality and quantum noise of gravitons and axions.

    DOI: 10.1142/S0218271822500985

  • Squeezed quantum states of graviton and axion in the universe

    Sugumi Kanno, Jiro Soda

    International Journal of Modern Physics D   31 ( 13 )   2021.12

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    Particle production during cosmic expansion can be interpreted as a two-mode
    squeezing process of quantum states. The two-mode squeezed states consist of an
    infinite number of entangled particles and then enhance the nonclassicality of
    particles. There are two methods for estimating the degree of squeezing. One is
    to employ instantaneous vacuum states, and the other is to adopt adiabatic
    vacuum states. We analytically study the squeezing process of gravitons and
    axions by using the two methods. We first consider a cosmological model of
    inflation followed by instantaneous reheating leading to a radiation dominated
    era. In the case of gravitons, we find no qualitatively difference in the
    squeezing between the two methods. However, for the axions, it turns out that
    the squeezing in the instantaneous vacuum increases as the mass increases while
    the squeezing decreases in the adiabatic vacuum as the mass increases. We then
    study the effect of non-instantaneous reheating on the the squeezing and show
    that the squeezing is enhanced compared with the instantaneous reheating. We
    also illustrate how the squeezed states enhance the violation of Bell
    inequality and quantum noise of gravitons and axions.

    DOI: 10.1142/S0218271822500985

  • Indirect detection of gravitons through quantum entanglement Reviewed

    Sugumi Kanno, Jiro Soda, Junsei Tokuda

    Physical Review D   104 ( 8 )   2021.10

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    DOI: 10.1103/physrevd.104.083516

  • Noise and decoherence induced by gravitons Reviewed

    Sugumi Kanno, Jiro Soda, Junsei Tokuda

    Physical Review D   103 ( 4 )   2021.2

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    DOI: 10.1103/physrevd.103.044017

  • Polarized Initial States of Primordial Gravitational Waves Reviewed

    Sugumi Kanno, Jiro Soda

    Symmetry   12 ( 4 )   672 - 672   2020.4

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    Polarizations of primordial gravitational waves can be relevant when considering an inflationary universe in modified gravity or when matter fields survive during inflation. Such polarizations have been discussed in the Bunch–Davies vacuum. Instead of taking into account the dynamical generation of polarizations of gravitational waves, in this paper, we consider polarized initial states constructed from S U ( 2 ) coherent states. We then evaluate the power spectrums of the primordial gravitational waves in the states.

    DOI: 10.3390/sym12040672

  • Nonclassical primordial gravitational waves from the initial entangled state Reviewed

    Sugumi Kanno

    Physical Review D   100 ( 12 )   2019.12

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    DOI: 10.1103/physrevd.100.123536

  • Detecting nonclassical primordial gravitational waves with Hanbury-Brown–Twiss interferometry Reviewed

    Sugumi Kanno, Jiro Soda

    Physical Review D   99 ( 8 )   2019.4

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    DOI: 10.1103/physrevd.99.084010

  • Anisotropic inflation with derivative couplings Reviewed

    Jonathan Holland, Sugumi Kanno, Ivonne Zavala

    Physical Review D   97 ( 10 )   2018.5

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    DOI: 10.1103/physrevd.97.103534

  • Quantum entanglement in de Sitter space with a wall and the decoherence of bubble universes Reviewed

    Andreas Albrecht, Sugumi Kanno, Misao Sasaki

    Physical Review D   97 ( 8 )   2018.4

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    DOI: 10.1103/physrevd.97.083520

  • Infinite violation of Bell inequalities in inflation Reviewed

    Kanno Sugumi, Soda Jiro

    Physical Review D   96 ( 8 )   83501 - 83501   2017.5

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    Infinite violation of Bell inequalities in inflation
    We study the violation of Bell-Mermin-Klyshko (BMK) inequalities in initial
    quantum states of scalar fields in inflation. We show that the Bell inequality
    is maximally violated by the Bunch-Davies vacuum which is a two-mode squeezed
    state of a scalar field. However, we find that the violation of the BMK
    inequalities does not increase with the number of modes to measure. We then
    consider a non-Bunch-Davies vacuum expressed by a four-mode squeezed state of
    two scalar fields. Remarkably, we find that the violation of the BMK
    inequalities increases exponentially with the number of modes to measure. This
    indicates that some evidence that our universe has a quantum mechanical origin
    may survive in CMB data even if quantum entanglement decays exponentially
    afterward due to decoherence.

    DOI: 10.1103/PhysRevD.96.083501

  • Vacuum state of the Dirac field in de Sitter space and entanglement entropy Reviewed

    Sugumi Kanno, Misao Sasaki, Takahiro Tanaka

    Journal of High Energy Physics   2017 ( 3 )   2017.3

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    DOI: 10.1007/jhep03(2017)068

  • Quantum discord in de Sitter space Reviewed

    Sugumi Kanno, Jonathan P. Shock, Jiro Soda

    Physical Review D   94 ( 12 )   2016.12

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    DOI: 10.1103/physrevd.94.125014

  • Cosmological implications of quantum entanglement in the multiverse Reviewed

    Sugumi Kanno

    Physics Letters B   751   316 - 320   2015.12

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    DOI: 10.1016/j.physletb.2015.10.050

  • A note on initial state entanglement in inflationary cosmology Reviewed

    Sugumi Kanno

    EPL (Europhysics Letters)   111 ( 6 )   60007 - 60007   2015.9

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    DOI: 10.1209/0295-5075/111/60007

  • Entanglement negativity in the multiverse Reviewed

    Sugumi Kanno, Jonathan P. Shock, Jiro Soda

    Journal of Cosmology and Astroparticle Physics   2015 ( 03 )   015 - 015   2015.3

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    DOI: 10.1088/1475-7516/2015/03/015

  • Entanglement entropy of α-vacua in de Sitter space Reviewed

    Sugumi Kanno, Jeff Murugan, Jonathan P. Shock, Jiro Soda

    Journal of High Energy Physics   2014 ( 7 )   2014.7

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    DOI: 10.1007/jhep07(2014)072

  • Impact of quantum entanglement on spectrum of cosmological fluctuations Reviewed

    Sugumi Kanno

    Journal of Cosmology and Astroparticle Physics   2014 ( 07 )   029 - 029   2014.7

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    DOI: 10.1088/1475-7516/2014/07/029

  • Schwinger effect in de Sitter space Reviewed

    Markus B. Fröb, Jaume Garriga, Sugumi Kanno, Misao Sasaki, Jiro Soda, Takahiro Tanaka, Alexander Vilenkin

    Journal of Cosmology and Astroparticle Physics   2014 ( 04 )   009 - 009   2014.4

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    DOI: 10.1088/1475-7516/2014/04/009

  • A viable explanation of the CMB dipolar statistical anisotropy Reviewed

    S. Kanno, M. Sasaki, T. Tanaka

    Progress of Theoretical and Experimental Physics   2013 ( 11 )   111E01 - 111E01   2013.11

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    DOI: 10.1093/ptep/ptt093

  • Rest frame of bubble nucleation Reviewed

    Jaume Garriga, Sugumi Kanno, Takahiro Tanaka

    Journal of Cosmology and Astroparticle Physics   2013 ( 06 )   034 - 034   2013.6

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    DOI: 10.1088/1475-7516/2013/06/034

  • Observer dependence of bubble nucleation and Schwinger pair production Reviewed

    Jaume Garriga, Sugumi Kanno, Misao Sasaki, Jiro Soda, Alexander Vilenkin

    Journal of Cosmology and Astroparticle Physics   2012 ( 12 )   006 - 006   2012.12

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    DOI: 10.1088/1475-7516/2012/12/006

  • EXACT COLEMAN–DE LUCCIA INSTANTONS Reviewed

    SUGUMI KANNO, JIRO SODA

    International Journal of Modern Physics D   21 ( 05 )   1250040 - 1250040   2012.5

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    We present exact Coleman–De Luccia (CDL) instantons, which describe vacuum decay from Anti-de Sitter (AdS) space, de Sitter (dS) space and Minkowski space to AdS space. We systematically obtain these exact solutions by considering deformation of Hawking-Moss (HM) instantons. We analytically calculate the action of instantons and discuss a subtlety in calculation of decay rates.

    DOI: 10.1142/s021827181250040x

  • Destabilizing Tachyonic Vacua at or above the BF Bound(Astrophysics and Cosmology) Reviewed

    KANNO Sugumi, SASAKI Misao, SODA Jiro, Institute of Cosmology Department of Physics and Astronomy Tufts University, Yukawa Institute for Theoretical Physics Kyoto University, Department of Physics Kyoto University

    Progress of theoretical physics   128 ( 1 )   213 - 226   2012.3

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    Destabilizing Tachyonic Vacua at or above the BF Bound
    It is well known that tachyonic vacua in an asymptotically Anti-de Sitter
    (AdS) space-time are classically stable if the mass squared is at or above the
    Breitenlohner and Freedman (BF) bound. We study the quantum stability of these
    tachyonic vacua in terms of instantons. We find a series of exact instanton
    solutions destabilizing tachyonic state at or above the BF bound in
    asymptotically AdS space. We also give an analytic formula for the decay rate
    and show that it is finite. Comparing our result with the well-known algebraic
    condition for the stability, we discuss stability conditions of tachyonic vacua
    at or above the BF bound.

    DOI: 10.1143/PTP.128.213

  • Tunneling without barriers with gravity Reviewed

    Sugumi Kanno, Misao Sasaki, Jiro Soda

    Classical and Quantum Gravity   29 ( 7 )   075010 - 075010   2012.3

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    DOI: 10.1088/0264-9381/29/7/075010

  • Holographic dual of de Sitter universe with AdS bubbles Reviewed

    Sugumi Kanno, Misao Sasaki, Jiro Soda

    Nuclear Physics B   855 ( 2 )   361 - 387   2012.2

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    DOI: 10.1016/j.nuclphysb.2011.10.020

  • A note on Gauss–Bonnet holographic superconductors Reviewed

    Sugumi Kanno

    Classical and Quantum Gravity   28 ( 12 )   127001 - 127001   2011.5

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    DOI: 10.1088/0264-9381/28/12/127001

  • Imprints of the anisotropic inflation on the cosmic microwave background Reviewed

    Masa-aki Watanabe, Sugumi Kanno, Jiro Soda

    Monthly Notices of the Royal Astronomical Society: Letters   412 ( 1 )   L83 - L87   2011.3

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    Abstract

    We study the imprints of the anisotropic inflation on the CMB temperature fluctuations and polarizations. The statistical anisotropy stems not only from the direction dependence of curvature and tensor perturbations, but also from the cross-correlation between curvature and tensor perturbations, and the linear polarization of tensor perturbations. We show that off-diagonal TB and EB spectra as well as on- and off-diagonal TT, EE, BB and TE spectra are induced from the anisotropic inflation. We emphasize that the off-diagonal spectra induced by the cross-correlation could be a characteristic signature of the anisotropic inflation.

    DOI: 10.1111/j.1745-3933.2011.01010.x

  • Gauss-Bonnet holographic superconductors Reviewed

    Luke Barclay, Ruth Gregory, Sugumi Kanno, Paul Sutcliffe

    Journal of High Energy Physics   2010 ( 12 )   2010.12

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    DOI: 10.1007/jhep12(2010)029

  • Anisotropic power-law inflation Reviewed

    Sugumi Kanno, Jiro Soda, Masa-aki Watanabe

    Journal of Cosmology and Astroparticle Physics   2010 ( 12 )   024 - 024   2010.12

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    DOI: 10.1088/1475-7516/2010/12/024

  • Stability of holographic superconductors Reviewed

    Sugumi Kanno, Jiro Soda

    Physical Review D   82 ( 8 )   2010.10

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    DOI: 10.1103/physrevd.82.086003

  • The Nature of Primordial Fluctuations from Anisotropic Inflation(Astrophysics and Cosmology) Reviewed

    Watanabe Masa-aki, Kanno Sugumi, Soda Jiro, Department of Physics Kyoto University, Centre for Particle Theory Department of Mathematical Sciences Durham University Science Laboratories, Department of Physics Kyoto University

    Progress of theoretical physics   123 ( 6 )   1041 - 1068   2010.2

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    The Nature of Primordial Fluctuations from Anisotropic Inflation
    We study the statistical nature of primordial fluctuations from an
    anisotropic inflation which is realized by a vector field coupled to an
    inflaton. We find a suitable gauge, which we call the canonical gauge, for
    anisotropic inflation by generalizing the flat slicing gauge in conventional
    isotropic inflation. Using the canonical gauge, we reveal the structure of the
    couplings between curvature perturbations, vector waves, and gravitational
    waves. We identify two sources of anisotropy, i.e. the anisotropy due to the
    anisotropic expansion of the universe and that due to the anisotropic couplings
    among variables. It turns out that the latter effect is dominant. Since the
    coupling between the curvature perturbations and vector waves is the strongest
    one, the statistical anisotropy in the curvature perturbations is larger than
    that in gravitational waves. We find the cross correlation between the
    curvature perturbations and gravitational waves which never occurs in
    conventional inflation. We also find the linear polarization of gravitational
    waves. Finally, we discuss cosmological implication of our results.

    DOI: 10.1143/PTP.123.1041

  • Cosmological magnetic fields from inflation and backreaction Reviewed

    Sugumi Kanno, Jiro Soda, Masa-aki Watanabe

    Journal of Cosmology and Astroparticle Physics   2009 ( 12 )   009 - 009   2009.12

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    DOI: 10.1088/1475-7516/2009/12/009

  • Holographic superconductors with higher curvature corrections Reviewed

    Ruth Gregory, Sugumi Kanno, Jiro Soda

    Journal of High Energy Physics   2009 ( 10 )   010 - 010   2009.10

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    DOI: 10.1088/1126-6708/2009/10/010

  • Inflationary Universe with Anisotropic Hair Reviewed

    Masa-aki Watanabe, Sugumi Kanno, Jiro Soda

    Physical Review Letters   102 ( 19 )   2009.5

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    DOI: 10.1103/physrevlett.102.191302

  • Anisotropic inflation from vector impurity Reviewed

    Sugumi Kanno, Masashi Kimura, Jiro Soda, Shuichiro Yokoyama

    Journal of Cosmology and Astroparticle Physics   2008 ( 08 )   034 - 034   2008.8

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    DOI: 10.1088/1475-7516/2008/08/034

  • Modified Friedmann equation and inflation in a warped codimension-two braneworld Reviewed

    Fang Chen, James M. Cline, Sugumi Kanno

    Physical Review D   77 ( 6 )   2008.3

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    DOI: 10.1103/physrevd.77.063531

  • Circular polarization of primordial gravitational waves in string-inspired inflationary cosmology Reviewed

    Masaki Satoh, Sugumi Kanno, Jiro Soda

    Physical Review D   77 ( 2 )   2008.1

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    DOI: 10.1103/physrevd.77.023526

  • Emergence of fluctuations from a tachyonic big bang Reviewed

    Robert H. Brandenberger, Andrew R. Frey, Sugumi Kanno

    Physical Review D   76 ( 8 )   2007.10

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    DOI: 10.1103/physrevd.76.083524

  • Towards a nonsingular tachyonic big crunch Reviewed

    Robert H. Brandenberger, Andrew R. Frey, Sugumi Kanno

    Physical Review D   76 ( 6 )   2007.9

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    DOI: 10.1103/physrevd.76.063502

  • Kaluza-Klein Braneworld Cosmology with Static Internal Dimensions(Astrophysics and Relativity) Reviewed

    Kanno Sugumi, Langlois David, Sasaki Misao, Jiro SODA, Department of Physics McGill University, APC Universite, Yukawa Institute for Theoretical Physics Kyoto University, Department of Physics Kyoto University

    Progress of theoretical physics   118 ( 4 )   701 - 713   2007.7

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    Kaluza-Klein braneworld cosmology with static internal dimensions
    We investigate the Kaluza-Klein braneworld cosmology from the point of view
    of observers on the brane. We first generalize the Shiromizu-Maeda-Sasaki (SMS)
    equations to higher dimensions. As an application, we study a (4+n)-dimensional
    brane with n dimensions compactified on the brane, in a (5+n)-dimensional bulk.
    By assuming that the size of the internal space is static, that the bulk
    energy-momentum tensor can be neglected, we determine the effect of the bulk
    geometry on the Kaluza-Klein braneworld. Then we derive the effective Friedmann
    equation on the brane. It turns out that the Friedmann equation explicitly
    depends on the equation of state, in contrast to the braneworld in a
    5-dimensional bulk spacetime. In particular, in a radiation-dominated era, the
    effective Newton constant depends on the scale factor logarithmically. If we
    include a pressureless matter on the brane, this dependence disappears after
    the radiation-matter equality. This may be interpreted as stabilization of the
    Newton constant by the matter on the brane. Our findings imply that the
    Kaluza-Klein braneworld cosmology is quite different from the conventional
    Kaluza-Klein cosmology even at low energy.

    DOI: 10.1143/PTP.118.701

  • Fate of Kaluza-Klein black holes: Evaporation or excision? Reviewed

    Keiju Murata, Jiro Soda, Sugumi Kanno

    Physical Review D   75 ( 10 )   2007.5

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    DOI: 10.1103/physrevd.75.104017

  • Evaporating (2+1)-dimensional black strings Reviewed

    Keiju Murata, Jiro Soda, Sugumi Kanno

    2007.1

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    We investigate (2+1)-dimensional black strings in the Kaluza-Klein spacetime.
    The system is classically stable as long as the horizon size is much larger
    than the size of the compact space. Semiclassically, however, the horizon size
    shrinks gradually due to the energy loss through the Hawking radiation.
    Eventually, the system will enter into the regime of the Gregory-Laflamme
    instability and get destabilized. Subsequently, the spherically symmetric black
    hole is formed and evaporated in the usual manner. This standard picture may be
    altered by the dynamics of the internal space which induced by the Hawking
    radiation. We argue that the black string is excised from the Kaluza-Klein
    spacetime before the onset of the Gregory-Laflamme instability and therefore
    before the evaporation.

  • Impact of Lorentz Violation on Cosmology Reviewed

    Jiro Soda, Sugumi Kanno

    2006.12

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    We discuss the impact of Lorentz violation on the cosmology. Firstly, we show
    that the Lorentz violation affects the dynamics of the chaotic inflationary
    model and gives rise to an interesting feature. Secondly, we propose the
    Lorentz violating DGP brane models where the Lorentz violating terms on the
    brane accelerate the current universe. We conjecture that the ghost disappears
    in the Lorentz violating DGP models.

  • More on the spectrum of perturbations in string gas cosmology Reviewed

    Robert H Brandenberger, Sugumi Kanno, Jiro Soda, Damien A Easson, Justin Khoury, Patrick Martineau, Ali Nayeri, Subodh P Patil

    Journal of Cosmology and Astroparticle Physics   2006 ( 11 )   009 - 009   2006.11

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/1475-7516/2006/11/009

  • Lorentz violating inflation Reviewed

    Sugumi Kanno, Jiro Soda

    Physical Review D   74 ( 6 )   2006.9

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    DOI: 10.1103/physrevd.74.063505

  • Moduli stabilization in string gas compactification Reviewed

    Sugumi Kanno, Jiro Soda

    Physical Review D   72 ( 10 )   2005.11

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    DOI: 10.1103/physrevd.72.104023

  • Black String Perturbations in RS1 Model Reviewed

    Sugumi Kanno, Jiro Soda

    2005.8

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    We present a general formalism for black string perturbations in
    Randall-Sundrum 1 model (RS1). First, we derive the master equation for the
    electric part of the Weyl tensor $E_{mu
    u}$. Solving the master equation
    using the gradient expansion method, we give the effective Teukolsky equation
    on the brane at low energy. It is useful to estimate gravitational waves
    emitted by perturbed rotating black strings. We also argue the effect of the
    Gregory-Laflamme instability on the brane using our formalism.

    DOI: 10.1007/s10714-005-0142-8

  • Braneworld flux inflation Reviewed

    Sugumi Kanno, Jiro Soda, David Wands

    Journal of Cosmology and Astroparticle Physics   2005 ( 08 )   002 - 002   2005.8

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    DOI: 10.1088/1475-7516/2005/08/002

  • Braneworld Cosmological Perturbation Theory at Low Energy Reviewed

    Jiro Soda, Sugumi Kanno

    2005.8

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    Homogeneous cosmology in the braneworld can be studied without solving bulk
    equations of motion explicitly. The reason is simply because the symmetry of
    the spacetime restricts possible corrections in the 4-dimensional effective
    equations of motion. It would be great if we could analyze cosmological
    perturbations without solving the bulk. For this purpose, we combine the
    geometrical approach and the low energy gradient expansion method to derive the
    4-dimensional effective action. Given our effective action, the standard
    procedure to obtain the cosmological perturbation theory can be utilized and
    the temperature anisotropy of the cosmic background radiation can be computed
    without solving the bulk equations of motion explicitly.

    DOI: 10.1007/s10714-005-0139-3

  • Low energy effective action for Hořava-Witten cosmology Reviewed

    Sugumi Kanno

    Physical Review D   72 ( 2 )   2005.7

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    DOI: 10.1103/physrevd.72.024009

  • 宇宙項問題とDブレーンインフレーション (特集 量子重力理論最前線--弦・ブレーン・ループが広げる新地平)

    早田 次郎, 菅野 優美

    数理科学   43 ( 4 )   20 - 25   2005.4

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    Language:Japanese  

  • Validity of a factorizable metric ansatz in string cosmology Reviewed

    Sugumi Kanno, Jiro Soda

    Physical Review D   71 ( 4 )   2005.2

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    DOI: 10.1103/physrevd.71.044031

  • Braneworld Cosmology Reviewed

    Jiro Soda, Sugumi Kanno

    2004.10

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    We present a general formalism for studying an inflationary scenario in the
    two-brane system. We explain the gradient expansion method and obtain the
    4-dimensional effective action. Based on this effective action, we give a basic
    equations for the background homogeneous universe and the cosmological
    perturbations. As an application, we propose a born-again braneworld scenario.

  • On The Higher Codimension Braneworld Reviewed

    Sugumi Kanno, Jiro Soda

    2004.10

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    We study a codimension 2 braneworld in the Einstein-Gauss-Bonnet gravity. In
    the linear regime, we show the conventional Einstein gravity can be recovered
    on the brane. While, in the nonlinear regime, we find corrections due to the
    thickness and the bulk geometry.

  • A Unified View of RS Braneworlds Reviewed

    Sugumi Kanno, Jiro Soda

    TSPU Bulletin   44N7   15 - 24   2004.7

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    There are various different descriptions of Randall-Sundrum (RS) braneworlds.
    Here we present a unified view of the braneworld based on the gradient
    expansion approach. In the case of the single-brane model, we reveal the
    relation between the geometrical and the AdS/CFT approach. It turns out that
    the high energy and the Weyl term corrections found in the geometrical approach
    merge into the CFT matter correction found in the AdS/CFT approach. We also
    clarify the role of the radion in the two-brane system. It is shown that the
    radion transforms the Einstein theory with Weyl correction into the conformally
    coupled scalar-tensor theory where the radion plays the role of the scalar
    field.

  • A quasi-thick codimension 2 braneworld Reviewed

    Sugumi Kanno, Jiro Soda

    Journal of Cosmology and Astroparticle Physics   2004 ( 07 )   002 - 002   2004.7

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    DOI: 10.1088/1475-7516/2004/07/002

  • Braneworld Kaluza–Klein corrections in a nutshell Reviewed

    Sugumi Kanno, Jiro Soda

    Physics Letters B   588 ( 3-4 )   203 - 209   2004.5

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    DOI: 10.1016/j.physletb.2004.03.043

  • Low Energy Effective Action for Dilatonic Braneworld —A Formalism for Inflationary Braneworld— Reviewed

    Sugumi Kanno, Jiro Soda

    General Relativity and Gravitation   36 ( 4 )   689 - 712   2004.4

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1023/b:gerg.0000016919.07175.92

  • Rotating black string and the effective Teukolsky equation in the braneworld Reviewed

    Sugumi Kanno, Jiro Soda

    Classical and Quantum Gravity   21 ( 7 )   1915 - 1923   2004.3

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/0264-9381/21/7/012

  • ブレーンワールドの創世と進化--衝突する4次元宇宙 (特集 ブレーンワールド新展開--時空の幾何学が示す新しい物理像)

    早田 次郎, 菅野 優美

    数理科学   42 ( 1 )   26 - 32   2004.1

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    Language:Japanese  

  • A Novel Approach to Braneworld Reviewed

    Jiro Soda, Sugumi Kanno

    2003.12

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    Evaluating Kaluza-Klein (KK) corrections is indispensable to test the
    braneworld scenario. In this report, we propose a novel symmetry approach to an
    effective 4-dimensional action with KK corrections for the Randall-Sundrum
    two-brane system.

  • Radionic Non-uniform Stable Black Strings Reviewed

    Takashi Tamaki, Sugumi Kanno, Jiro Soda

    2003.12

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    Non-uniform black strings in the two-brane system are investigated using the
    effective action approach. It is shown that the radion acts as a non-trivial
    hair of black strings. The stability of solutions is demonstrated using the
    catastrophe theory. The black strings are shown to be non-uniform.

  • Inflationary Braneworld Driven By Bulk Scalar Field Reviewed

    Jiro Soda, Sugumi Kanno

    2003.12

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    We have developed a formalism to study an inflationary scenario driven by a
    bulk inflaton in the two-brane system. The 4-dimensional low energy effective
    action is obtained using the gradient expansion method. It is also found that
    the dark radiation and the dark scalar source are expressed by the radion. In
    the single-brane limit, we find these dark components disappear. Therefore, it
    turns out that the inflation due to the bulk inflaton successfully takes place.
    Kaluza-Klein corrections are also taken into account in this case.

  • Gravitational Waves from Rotating Black Strings Reviewed

    Sugumi Kanno, Jiro Soda

    2003.12

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    In the Randall-Sundrum two-brane model (RS1), a Kerr black hole on the brane
    can be naturally identified with a section of rotating black string. To
    estimate Kaluza-Klein (KK) corrections on gravitational waves emitted by
    perturbed rotating black strings, we give the effective Teukolsky equation on
    the brane which is separable equation and hence numerically manageable. In this
    process, we derive the master equation for the electric part of the Weyl tensor
    $E_{mu
    u}$ which would be also useful to discuss the transition from black
    strings to localized black holes triggered by Gregory-Laflamme instability.

  • Effective Teukolsky Equation on the Brane Reviewed

    Sugumi Kanno, Jiro Soda

    2003.12

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    To estimate Kaluza-Klein (KK) corrections on gravitational waves emitted by
    perturbed rotating black strings, we give the effective Teukolsky equation on
    the brane which is separable equation and hence numerically manageable.

  • Radionic Non-uniform Black Strings --short version-- Reviewed

    Takashi Tamaki, Sugumi Kanno, Jiro Soda

    2003.11

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    Non-uniform black strings in the two-brane system are investigated using the
    effective action approach. It is shown that the radion acts as a non-trivial
    hair of black strings. The stability of solutions is demonstrated using the
    catastrophe theory. The black strings are shown to be non-uniform.

  • Radionic nonuniform black strings Reviewed

    Tamaki T, Kanno S, Soda J

    PHYSICAL REVIEW D   69 ( 2 )   2003.7

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    Radionic Non-uniform Black Strings
    Non-uniform black strings in the two-brane system are investigated using the
    effective action approach. It is shown that the radion acts as a non-trivial
    hair of the black strings. From the brane point of view, the black string
    appears as the deformed dilatonic black hole which becomes dilatonic black hole
    in the single brane limit and reduces to the Reissner-Nordstr"om black hole in
    the close limit of two-branes. The stability of solutions is demonstrated using
    the catastrophe theory. From the bulk point of view, the black strings are
    proved to be non-uniform. Nevertheless, the zeroth law of black hole
    thermodynamics still holds.

    DOI: 10.1103/PhysRevD.69.024010

  • Born-Again Braneworld Reviewed

    S. Kanno, M. Sasaki, J. Soda

    Progress of Theoretical Physics   109 ( 3 )   357 - 369   2003.3

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    DOI: 10.1143/ptp.109.357

  • Non-linear Gravity on Branes and Effective Action Reviewed

    Jiro Soda, Sugumi Kanno

    2003.1

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    We develop the general formalism to study the low energy regime of the brane
    world. We apply our formalism to the single brane model where the AdS/CFT
    correspondence will take an important role. We also consider the two-brane
    system and show the system is described by the quasi-scalar tensor gravity. Our
    result provides a basis for predicting CMB fluctuations in the braneworld
    models.

  • Born-Again Braneworld Reviewed

    Kanno Sugumi, Sasaki Misao, Soda Jiro, Graduate School of Human and Environmental Studies Kyoto University, Department of Earth and Space Science Graduate School of Science Osaka University, Department of Fundamental Sciences FIHS Kyoto University

    Progress of theoretical physics   109 ( 3 )   357 - 369   2002.10

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    Born-Again Braneworld
    We propose a cosmological braneworld scenario in which two branes collide and
    emerge as reborn branes whose tensions have signs opposite to the original
    tensions of the respective branes. In this scenario, gravity on each of the
    branes is described by a scalar-tensor-type theory in which the radion plays
    the role of the gravitational scalar, and the branes are assumed to be
    inflating. However, the whole dynamics is different from those of the usual
    inflation, due to the non-trivial dynamics of the radion field. Transforming
    the conformal frame to the Einstein frame, this born-again scenario resembles
    the pre-big-bang scenario. Thus, our scenario has features of both inflation
    and pre-big-bang scenarios. In particular, gravitational waves produced from
    vacuum fluctuations may have a very blue spectrum, while the inflaton field
    gives rise to a standard scale-invariant spectrum.

    DOI: 10.1143/PTP.109.357

  • Radion and holographic brane gravity Reviewed

    Sugumi Kanno, Jiro Soda

    Physical Review D   66 ( 8 )   2002.10

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/physrevd.66.083506

  • Holographic View of Cosmological Perturbations Reviewed

    Jiro Soda, Sugumi Kanno

    Astrophys.Space Sci.   2002.9

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    The cosmological perturbation theory is revisited from the holographic point
    of view. In the case of the single brane model, it turns out that the AdS/CFT
    correspondence plays an important role. In the case of the two-brane model, it
    is shown that the effective equations of motion becomes the quasi-scalar-tensor
    gravity. It is also demonstrated that the radion anisotropy gives the CMB
    fluctuations through the Sachs-Wolfe effect.

    DOI: 10.1023/A:1022519910504

  • Braneworld Effective Action at Low Energies Reviewed

    Sugumi Kanno, Jiro Soda

    Astrophys.Space Sci.   2002.9

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    The low energy effective theory for the Randall-Sundrum two-brane system is
    investigated with an emphasis on the role of the non-linear radion in the brane
    world. It is shown that the gravity on the brane world is described by a
    quasi-scalar-tensor theory with a specific coupling function.

    DOI: 10.1023/A:1022556701901

  • Brane world effective action at low energies and AdS/CFT correspondence Reviewed

    Sugumi Kanno, Jiro Soda

    Physical Review D   66 ( 4 )   2002.8

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    Language:Others   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/physrevd.66.043526

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Professional Memberships

  • 日本物理学会

Committee Memberships

  • 京都大学基礎物理学研究所共同利用運営委員会委員   Steering committee member   Domestic

    2023.4 - 2024.3   

  • 日本物理学会九州支部   Organizer   Domestic

    2021.4 - 2022.3   

Research Projects

  • Detection theory for high-frequency gravitational waves with Rydberg atoms

    Grant number:24K21548  2024.6 - 2027.3

    Grants-in-Aid for Scientific Research  Grant-in-Aid for Challenging Research (Exploratory)

    早田 次郎, 菅野 優美

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    Grant type:Scientific research funding

    重力波干渉計LIGOが初めて重力波直接観測に成功して以来、重力波天文学の進展は目覚ましい。しかし、将来的には、さらに観測可能な振動数帯を広げていかなければならない。特に、10kHz以上の高周波重力波の検出が可能になれば、初期宇宙の相転移現象など基礎物理学の進展が期待される。申請者は、キャビティー内に磁場をかけると、GHz重力波が時間変動する電場に転換されることに着目した。つまり、高精度で電場を測定できればGHz重力波が検出できる。リュードベリ原子は電気双極子モーメントが大きいため、精度良く電場を測定できる。そこで、本研究では、リュードベリ原子を用いた高周波重力波検出の理論研究を行う。

    CiNii Research

Class subject

  • 物理学基礎演習

    2023.10 - 2024.3   Second semester

  • 宇宙物理学

    2023.10 - 2024.3   Second semester

  • 現代物理学基礎

    2023.4 - 2023.9   First semester

  • 物理学入門IIA

    2022.10 - 2023.3   Second semester

  • 宇宙物理学

    2022.10 - 2023.3   Second semester

  • 物理学基礎演習

    2022.10 - 2023.3   Second semester

  • 現代物理学基礎

    2022.4 - 2022.9   First semester

  • 最先端物理学

    2022.4 - 2022.9   First semester

  • 宇宙物理学

    2021.10 - 2022.3   Second semester

  • 物理学基礎演習

    2021.10 - 2022.3   Second semester

  • 基幹物理学Ⅱ

    2021.4 - 2021.9   First semester

  • 最先端物理学

    2021.4 - 2021.9   First semester

  • 物理学基礎演習

    2020.10 - 2021.3   Second semester

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FD Participation

  • 2024.2   Role:Moderator   Title:【物理学科FD】大学院の魅力創造に向けて

    Organizer:Undergraduate school department

  • 2022.3   Role:Participation   Title:【物理学科FD】ティーチング・フェロー制度の概要と講義での活用に向けて

    Organizer:Undergraduate school department

  • 2021.4   Role:Participation   Title:令和3年度 第1回全学FD(新任教員の研修)

    Organizer:University-wide

  • 2021.4   Role:Participation   Title:2021年度新任教員教育セミナー

    Organizer:University-wide

  • 2021.3   Role:Participation   Title:【物理学FD】ハイブリッド講義の実践例と講義活性化

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2020.9   Role:Participation   Title:M2B学習支援システム講習会(オンライン開催)◇初級編・中級編◇10:00~12:00

    Organizer:University-wide

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Social Activities

  • 名古屋大学 第5回名古屋大学素粒子宇宙コロキウム

    名古屋大学物理学教室  名古屋大学  2023.3

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 1001 Space Nights

    International Space Science Institute, Beijing  Online  2022.2

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 第3回 女性科学者サミット@阪大豊中

    大阪大学大学院理学研究科、基礎工学研究科  オンライン  2021.3

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    Audience:General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

    研究者を目指す学生や若手研究者のために、また研究交流やネットワーク作りのため、大阪大学で毎年行われる。