J-GLOBAL         Last updated: Sep 20, 2019 at 17:31
Kobe University
Graduate School of Science Division of Physics
Job title

Research Interests


Research Areas


Awards & Honors

Statistical Anisotropy from Anisotropic Inflation, Highlights of 2011-2012, IOP, Classical and Quantum Gravity
Winner: Soda Jiro
Jan 2010
Cosmology and black holes in higher dimensional gravity, Yukawa-Kimura prize, Yukawa Memorial Foundation
Winner: Soda Jiro

Published Papers

Electromagnetic waves propagating in the string axiverse
Progress of Theoretical and Experimental Physics   041E01   Apr 2018   [Refereed]
Conversion of Gravitons into Dark Photons in Cosmological Dark Magnetic Fields
Phys.Rev.   D98(023540)    2018   [Refereed]
Cosmological Imprints of String Axions in Plateau
SODA Jiro, Y. Urakawa
Eur.Phys.J.   C78 041E01   2018   [Refereed]
Detecting nonclassical primordiall gravitational waves with Hanbury-Brown-Twiss interfereometry
S. Kanno, SODA Jiro
Phys.Rev.   D99 084010   2018   [Refereed]
Dressed Power-law Inflation with Cuscuton,
ITO Asuka, IYONAGA Aya, KIM Suro, SODA Jiro
Phys.Rev.   D99(083502)    2018   [Refereed]
Exploring the string axiverse and parity violation in gravity with gravitational waves
Int.J.Mod.Phys.   D27(09) 1850096   2018   [Refereed]
Gravitational Wave Forest from String Axiverse
N. Kitajima, SODA Jiro
JCAP   1810(008)    2018   [Refereed]
Quasinormal modes of p-forms in spherical black holes
Phys.Rev.   D99 044054   2018   [Refereed]
Searching for Bispectrum of Stochastic Gravitational Waves with Pulsar Timing Arrays
MAKOTO Tsuneto, ITO Asuka, NOUMI Toshifumi, SODA Jiro
JCAP   1903(03) 032   2018   [Refereed]
Anisotropic constant-roll inflation
AOKI Arata, SODA Jiro
Eur.Phys.J   C78(1) 55   2017   [Refereed]
Bell inequality and its application to cosmology
菅野 優美, SODA Jiro
Galaxies   5 99   2017   [Refereed]
SODA Jiro, YOSHIDA Daisuke
Phys.Rev.   D96(6) 064005   2017   [Refereed]
Electromagnetic waves propagating in the string axiverse
SODA Jiro, YOSHIDA Daisuke
PTEP 2018   (4) 041E01   2017   [Refereed]
Exploring String Axions with Gravitational Waves
SODA Jiro, YOSHIDA Daisuke
Galaxies   5(4) 96   2017   [Refereed]
Exploring the string axiverse and parity violation in gravity with gravitational waves
SODA Jiro, YOSHIDA Daisuke
Int. J. Mod. Phys   D    2017   [Refereed]
KANNO Sugumi, SODA Jiro
S. Kanno, and J.Soda   D96 083501   2017   [Refereed]
AOKI Arata, SODA Jiro
Phys. Rev.   D96 023534   2017   [Refereed]
arXiv      2017   [Refereed]
AOKI Arata, SODA Jiro
Phys.Lett.   B771    2017   [Refereed]
Schwinger Pair Production by Electric Field Coupled to Inflation
J.J.Geng,B.Li, SODA Jiro, A.Wang,Q.WuT.Zhu
JCAP   1802 018   2017   [Refereed]
AOKI Arata, SODA Jiro
Int. J. Mod. Phys. D      Oct 2016   [Refereed]
G.Hikmawan, J.Soda, A.Suroso, F.P.Zen
Phys. Rev. D   93(6) 068301   2016   [Refereed]
MHz Gravitational Waves from Short-term Anisotropic Inflation,
ITO Asuka, SODA Jiro
JCAP 04 (2016)      2016   [Refereed]
ITO Asuka, SODA Jiro
arXiv      2016   [Refereed]
R.Kato, J.Soda
Phys. Rev. D   93(6) 062003   2016   [Refereed]
A.Aoki, J.Soda
Phys. Rev. D   93 083503   2016   [Refereed]
Kanno Suzugmi, J.P.Shock, SODA Jiro
Phys. Rev.      2016   [Refereed]
D.Yoshida, J.Soda
Phys. Rev. D   93(4) 044024   2016   [Refereed]
I.Obata, T.Miura, J.Soda
Phys. Rev. D   92(6) 063516   2015   [Refereed]
A.Ito, J.Soda
Phys. Rev. D   92(12) 123533   2015   [Refereed]
Y.Sakakihara, J.Soda
JCAP   1509(9) 015   2015   [Refereed]
I Obata, T Miura, J Soda
Phys. Rev   D90 045005   2014   [Refereed]
Entanglement entropy of alpha-vacua in de Sitter space
S Kanno, J Murugan, J Shock, J Soda
JHEP   1407 072   2014   [Refereed]
Entanglement negativity in the multiverse
S Kanno, J Shock, J Soda
JCAP   1503 015   2014   [Refereed]
Scwinger effect in de Sitter space
M B Frob, J Garriga, S Kanno, M Sasaki, J Soda, T Tanaka, A Vilenkin
JCAP   1404 009   2014   [Refereed]
J.Ohashi, J.Soda, S.Tsujikawa
Phys. Rev.   D88 103517   2013   [Refereed]
Takahashi T, Soda J
Physical review letters   102(23) 1-231301   Jun 2009   [Refereed]
Watanabe MA, Kanno S, Soda J
Physical review letters   102(19) 1-191302   May 2009   [Refereed]


Jiro Soda
Classical and Quantum Gravity   29(8) 1-83001   Jan 2012
We review an inflationary scenario with the anisotropic expansion rate. An
anisotropic inflationary universe can be realized by a vector field coupled
with an inflaton, which can be regarded as a counter example to the cosmic
no-hair conjecture. W...
Soda Jiro
Meeting abstracts of the Physical Society of Japan   66(1)    Mar 2011
Jiro Soda
Lect.Notes Phys.828:235-270,2011   828 235-270   Jan 2010
It is widely recognized that the AdS/CFT correspondence is a useful tool to
study strongly coupled field theories. On the other hand, Randall-Sundrum (RS)
braneworld models have been actively discussed as a novel cosmological
framework. Interestin...
Soda Jiro
Meeting abstracts of the Physical Society of Japan   58(1)    Mar 2003
Jiro Soda
   Feb 2002
It is important to reveal the brane-bulk correspondence for understanding the
brane world cosmology. When gravitational waves exist in the bulk, however, it
is difficult to make the analysis of the interrelationship between the brane
and the bulk....
Jiro Soda
   Aug 2001
Recently, branes in supergravity have become an indispensable tool even for
traditional relativists. The purpose of this manuscript is to provide a
pedagogical account of the brane technology so that the relativists can use
branes in their study. ...
Hiromi Saida, Jiro Soda
   Jan 2000
For the BTZ black hole in the Einstein gravity, a statistical entropy has
been calculated. It is equal to the Bekenstein-Hawking entropy. In this
article, its statistical entropy in the higer curvature gravity is calculated
and shown to be equal t...
Hiromi Saida, Jiro Soda
Phys.Lett. B471 (2000) 358-366   471(4) 358-366   Sep 1999
For the BTZ black hole in the Einstein gravity, a statistical entropy has
been calculated to be equal to the Bekenstein-Hawking entropy. In this paper,
the statistical entropy of the BTZ black hole in the higher curvature gravity
is calculated and...
Shinsuke Kawai, Jiro Soda
   Jun 1999
We propose novel structure formation scenarios based on a non-singular higher
curvature cosmological model. The model is motivated by the Tex coupling of a
scalar field appearing in the string theory, and in our scenarios the universe
has no beg...
Kazuya Koyama, Jiro Soda
Phys.Rev.Lett. 82 (1999) 2632-2635   82(13) 2632-2635   Oct 1998
We propose a primeval baryon isocurvature model in the context of the
Affleck-Dine (AD) baryogenesis mechanism. Quantum fluctuations of the AD field
during inflation produce fluctuations in the baryon number. We obtain a model
which gives both the...
Shinsuke Kawai, Jiro Soda
Phys.Rev. D59 (1999) 063506      Jul 1998
Non-singular Bianchi type I solutions are found from the effective action
with a superstring-motivated Gauss-Bonnet term. These anisotropic non-singular
solutions evolve from the asymptotic Minkowski region, subsequently
super-inflate, and then sm...
Takeshi Chiba, Jiro Soda
Prog.Theor.Phys. 96 (1996) 567-574   96(3) 567-574   Mar 1996
The collapse of a massless scalar field in the Brans-Dicke theory of
gravitation is studied in the analysis of both analytical solution and
numerical one. By conformally transforming the Roberts's solution into the
Brans-Dicke frame, we find for $...

Conference Activities & Talks

日本物理学会   Mar 2019   日本物理学会
YOSHIDA Daisuke, JIRO Soda
日本物理学会   Mar 2019   日本物理学会
TSUNETO Makoto, ITO Asuka, NOUMI Toshifumi, JIRO Soda
日本物理学会第74回年次大会   Mar 2019   日本物理学会
日本物理学会第74回年次大会   Mar 2019   日本物理学会
Parity Violation in Gravity: probing with gravitational waves [Invited]
新学術「重力波物理学」   Feb 2019   

Teaching Experience


Association Memberships


Research Grants & Projects

Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2006 - 2009    Investigator(s): Jiro SODA
Due to developments of observations, it becomes important to check the fundamental principle such as Lorentz invariance. Moreover, precision cosmology urged us to study theoretical fine structure. However small it is, it is worth exploring in deta...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 2005 - 2008    Investigator(s): Misao SASAKI
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2002 - 2005    Investigator(s): Jiro SODA
Recent observation on cosmic background radiation by WMAP strongly supports the validity of the inflationary scenario. Nowadays, the most important issue in theoretical cosmology is to unveil the inflaton. On the other hand, it is widely believed ...