TANAKA Takahiro

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Name
TANAKA Takahiro
Affiliation
Kyoto University
Section
Graduate School of Science, Division of Physics and Astronomy
Job title
Associate Professor
Degree
Doctor of Science
ORCID ID
0000-0001-8406-5183

Research Areas

 
 

Education

 
 
 - 
1995
Graduate School, Division of Natural Science, Kyoto University
 
 
 - 
1990
Faculty of Science, Kyoto University
 

Published Papers

 
Hiroyuki Nakano, Tatsuya Narikawa, Ken-ichi Oohara, Kazuki Sakai, Hisa-aki Shinkai, Hirotaka Takahashi, Takahiro Tanaka, Nami Uchikata, Shun Yamamoto, Takahiro S. Yamamoto
   Nov 2018
The ringdown part of gravitational waves in the final stage of merger of
compact objects tells us the nature of strong gravity which can be used for
testing the theories of gravity. The ringdown waveform, however, fades out in a
very short time wi...
Soichiro Isoyama, Ryuichi Fujita, Hiroyuki Nakano, Norichika Sago, Takahiro Tanaka
PTEP   2019(1) 013E01   Jan 2019   [Refereed]
The "flux-balance formulae" that determine the averaged evolution of energy,
azimuthal angular momentum and Carter constant in terms of the averaged
asymptotic gravitational-wave fluxes for inspirals of small bodies into Kerr
black holes were firs...
Masashi Kimura, Takahiro Tanaka
Class.Quant.Grav.   36(5) 055005   Mar 2019   [Refereed]
We propose a simple method to prove the linear mode stability of a black hole
when the perturbed field equations take the form of a system of coupled
Schrödinger equations. The linear mode stability of the spacetime is
guaranteed by the existenc...
Nicholas Loutrel, Takahiro Tanaka, Nicolas Yunes
Class.Quant.Grav.   36(10) 10LT02   Apr 2019   [Refereed]
Parity violation in the gravitational interaction has an important impact on
fundamental observables and the evolution of the universe. We here investigate
for the first time our ability to probe the parity violating nature of the
gravitational in...
Nicholas Loutrel, Takahiro Tanaka, Nicolas Yunes
Phys. Rev. D 98, 064020 (2018)      Jun 2018   [Refereed]
Gravitational waves from spin-precessing binaries exhibit amplitude
oscillations that provide an invaluable method to extract the spins of the
inspiraling compact objects. The spin-spin and spin-orbit interactions that
cause this effect are sensit...
Junsei Tokuda, Takahiro Tanaka
1811(no.11,) 022   Nov 2018   [Refereed]
It is known that in the theory of light scalar fields during inflation,
correlation functions suffer from infrared (IR) divergences or large IR loop
corrections, leading to the breakdown of perturbation theory. In order to
understand the physical ...
Masashi Kimura, Takahiro Tanaka
Class.Quant.Grav. 35 (2018) no.19, 195008      Sep 2018   [Refereed]
The Tex-deformation method is a useful way to show the linear mode stability
of a black hole when the perturbed field equation takes the form of the
Schrödinger equation. While previous works where many explicit examples are
studied suggest that...
Remya Nair, Takahiro Tanaka
JCAP 1808 (2018) no.08, 033, Erratum: JCAP 1811 (2018) no.11, E01      Aug 2018   [Refereed]
We study the advantage of combining measurements from future ground and space
based gravitational wave detectors in estimating the parameters of a black-hole
binary coalescence. This is an extension of our previous work (PTEP 053E01
(2016)) where ...
Misao Sasaki, Teruaki Suyama, Takahiro Tanaka, Shuichiro Yokoyama
35(6) 063001   Jun 2018   [Refereed][Invited]
This is a review article on the primordial black holes (PBHs), with
particular focus on the massive ones (Tex) which have not
evaporated by the present epoch by the Hawking radiation. By the detections of
gravitational waves b...
Tomohiro Fujita, Ippei Obata, Takahiro Tanaka, Shuichiro Yokoyama
JCAP   1807 023   Jul 2018   [Refereed]
We consider the inflationary universe with a spectator scalar field coupled
to a Tex gauge field and calculate curvature perturbation and gravitational
waves (GWs). We find that the sourced GWs can be larger than the one from
vacuum fluctuation...
Bence Kocsis, Teruaki Suyama, Takahiro Tanaka, Shuichiro Yokoyama
Astrophys.J. 854 (2018) no.1, 41   854(1) 41   Jan 2018   [Refereed]
It has been proposed that primordial black holes (PBHs) form binaries in the
radiation dominated era. Once formed, some fraction of them may merge within
the age of the Universe by gravitational radiation reaction. We investigate the
merger rate o...
Junsei Tokuda, Takahiro Tanaka
JCAP   1802 014   Feb 2018   [Refereed]
In this study, we formulate a systematic way of deriving an effective
equation of motion(EoM) for long wavelength modes of a massless scalar field
with a general potential Tex on de Sitter background, and investigate
whether or not the effec...
Takahiro Tanaka, Yuko Urakawa
JHEP   1710 127   Oct 2017   [Refereed]
It is widely known that the primordial curvature perturbation Tex has
several universal properties in the infrared (IR) such as the soft theorem,
which is also known as the consistency relation, and the conservation in time.
They are valid in ...
Hiroyuki Nakano, Norichika Sago, Hideyuki Tagoshi, Takahiro Tanaka
PTEP 2017 (2017) no.7, 071E01      Jul 2017   [Refereed]
Recently the possibility of detecting echoes of ringdown gravitational waves
from binary black hole mergers was shown. The presence of echoes is expected if
the black hole is surrounded by a mirror that reflects gravitational waves near
the horizo...
Sugumi Kanno, Misao Sasaki, Takahiro Tanaka
JHEP 1703 (2017) 068      Dec 2016   [Refereed]
We compute the entanglement entropy of a free massive Dirac field between two
causally disconnected open charts in de Sitter space. We first derive the
Bunch-Davies vacuum mode functions of the Dirac field. We find there exists no
supercurvature m...
Ryuichi Fujita, Soichiro Isoyama, Alexandre Le Tiec, Hiroyuki Nakano, Norichika Sago, Takahiro Tanaka
Class. Quantum Grav. 34 134001 (2017)      Dec 2016   [Refereed]
We formulate a Hamiltonian description of the orbital motion of a point
particle in Kerr spacetime for generic (eccentric, inclined) orbits, which
accounts for the effects of the conservative part of the gravitational
self-force. This formulation ...
Ryuichi Fujita, Soichiro Isoyama, Alexandre Le Tiec, Hiroyuki Nakano, Norichika Sago, Takahiro Tanaka
Class.Quant.Grav.   34(13) 134001   Jun 2017   [Refereed]
We formulate a Hamiltonian description of the orbital motion of a point
particle in Kerr spacetime for generic (eccentric, inclined) orbits, which
accounts for the effects of the conservative part of the gravitational
self-force. This formulation ...
Nakamura, Takashi and others
Progress of Theoretical and Experimental Physics   2016(9)    Jul 2016   [Refereed]
Pre-DECIGO consists of three spacecraft arranged in an equilateral triangle
with 100km arm lengths orbiting 2000km above the surface of the earth. It is
hoped that the launch date will be in the late 2020s.
Pre-DECIGO has one clear target: binar...
Rampei Kimura, Takahiro Tanaka, Kazuhiro Yamamoto, Yasuho Yamashita
Phys. Rev. D 94, 064059 (2016)      May 2016   [Refereed]
We investigate gravitational Cherenkov radiation in a healthy branch of
background solutions in the ghost-free bigravity model. In this model, because
of the modification of dispersion relations, each polarization mode can possess
subluminal phase...
Yuki Sakakihara, Takahiro Tanaka
JCAP 1609 (2016) 09, 033      May 2016   [Refereed]
We investigate primordial gravitational waves and curvature perturbations in
de Rham-Gabadadze-Tolley (dRGT) bimetric gravity. We evaluate the power-spectra
in the leading order in slow roll. Taking into account the decay of massive
graviton, we f...
Hiroyuki Nakano, Norichika Sago, Takahiro Tanaka, Takashi Nakamura
Prog. Theor. Exp. Phys. (2016) 083E01      Apr 2016   [Refereed]
The Sasaki-Nakamura transformation gives a short-ranged potential and a
convergent source term for the master equation of perturbations in the Kerr
space-time. In this paper, we study the asymptotic behavior of the
transformation, and present a ne...
Misao Sasaki, Teruaki Suyama, Takahiro Tanaka, Shuichiro Yokoyama
Phys. Rev. Lett. 117, 061101 (2016)      Mar 2016   [Refereed]
We point out that the gravitational-wave event GW150914 observed by the LIGO
detectors can be explained by the coalescence of primordial black holes (PBHs).
It is found that the expected PBH merger rate would exceed the rate estimated
by the LIGO ...
Hiroyuki Nakano, Takashi Nakamura, Takahiro Tanaka
Prog. Theor. Exp. Phys. (2016) 031E02      Feb 2016   [Refereed]
Recent numerical relativity simulations of mergers of binary black holes
suggest that the maximum final value of Tex is Tex for the
coalescence of two equal mass black holes with aligned spins of the same
magnitude Tex which is c...
Takashi Nakamura, Hiroyuki Nakano, Takahiro Tanaka
Phys. Rev. D 93, 044048 (2016)      Jan 2016   [Refereed]
Recent population synthesis simulations of Pop III stars suggest that the
event rate of coalescence of Tex--Tex binary black holes
can be high enough for the detection by the second generation gravitational
wave detectors. The...
Yasuho Yamashita, Takahiro Tanaka
JCAP 1605 (2016) no.05, 011      Oct 2015   [Refereed]
We discuss how the ghost-free bigravity coupled with a single scalar field
can be derived from a braneworld setup. We consider DGP two-brane model without
radion stabilization. The bulk configuration is solved for given boundary
metrics, and it is...
Hiroyuki Nakano, Takahiro Tanaka, Takashi Nakamura
Phys. Rev. D 92, 064003 (2015)      Jun 2015   [Refereed]
There is a forbidden region in the parameter space of quasinormal modes of
black holes in general relativity. Using both inspiral and ringdown phases of
gravitational waves from binary black holes, we propose two methods to test
general relativity...
Remya Nair, Sanjay Jhingan, Takahiro Tanaka
   Apr 2015   [Refereed]
We study the advantage of the co-existence of future ground and space based
gravitational wave detectors, in estimating the parameters of a binary
coalescence. Using the post-Newtonian waveform for the inspiral of non-spinning
neutron star-black h...
Tatsuya Narikawa, Koh Ueno, Hideyuki Tagoshi, Takahiro Tanaka, Nobuyuki Kanda, Takashi Nakamura
Phys. Rev. D 91, 062007 (2015)      Dec 2014   [Refereed]
The gravitational waveforms in the ghost-free bigravity theory exhibit
deviations from those in general relativity. The main difference is caused by
graviton oscillations in the bigravity theory. We investigate the prospects for
the detection of t...
Yasuho Yamashita, Antonio De Felice, Takahiro Tanaka
Int.J.Mod.Phys. D23 (2014) 1443003      Aug 2014
We discuss the ghost freeness in the case when we add matter coupled to two
metrics to the ghost-free bigravity. In this paper we show that the
Boulware-Deser ghost generally revives in the presence of doubly coupled matter
and that ghost freeness...
Soichiro Isoyama, Leor Barack, Sam R. Dolan, Alexandre Le Tiec, Hiroyuki Nakano, Abhay G. Shah, Takahiro Tanaka, Niels Warburton
Phys. Rev. Lett. 113, 161101 (2014)      Apr 2014
For a self-gravitating particle of mass \mu in orbit around a Kerr black hole
of mass M >> \mu, we compute the O(\mu/M) shift in the frequency of the
innermost stable circular equatorial orbit (ISCEO) due to the conservative
piece of the gravitati...
Antonio De Felice, A. Emir Gumrukcuoglu, Shinji Mukohyama, Norihiro Tanahashi, Takahiro Tanaka
JCAP 1406 (2014) 037      Apr 2014   [Refereed]
We study cosmological perturbations in bimetric theory with two fluids each
of which is coupled to one of the two metrics. Focusing on a healthy branch of
background solutions, we clarify the stability of the cosmological
perturbations. For this p...
Markus B. Fröb, Jaume Garriga, Sugumi Kanno, Misao Sasaki, Jiro Soda, Takahiro Tanaka, Alexander Vilenkin
   Jan 2014   [Refereed]
We consider Schwinger pair production in 1+1 dimensional de Sitter space,
filled with a constant electric field Tex. This can be thought of as a model
for describing false vacuum decay beyond the semiclassical approximation, where
pairs of a quant...
Antonio De Felice, Takashi Nakamura, Takahiro Tanaka
Prog. Theor. Exp. Phys. (2014) 043E01      Apr 2013   [Refereed]
We discuss graviton oscillations based on the ghost free bi-gravity theory.
We point out that this theory possesses a natural cosmological background
solution which is very close to the case of general relativity. Furthermore,
interesting paramete...
QFT in the flat chart of de Sitter space
Y. Korai, T. Tanaka
Phys. Rev. D87 (2013) 024013, YITP-12-112, arXiv:1210.6544 [gr-qc].      2013   [Refereed]
T. Tanaka; Y. Urakawa
Classical and Quantum Gravity   30(23)    2013   [Refereed]
T. Tanaka; Y. Urakawa
Progress of Theoretical and Experimental Physics   2013(8)    2013   [Refereed]
J. Garriga; S. Kanno; T. Tanaka
Journal of Cosmology and Astroparticle Physics   2013(6)    2013   [Refereed]
S. Isoyama; R. Fujita; H. Nakano; N. Sago; T. Tanaka
Progress of Theoretical and Experimental Physics   2013(6)    2013   [Refereed]
T. Tanaka; Y. Urakawa
Progress of Theoretical and Experimental Physics   2013(6)    2013   [Refereed]
K. Yagi; L.C. Stein; N. Yunes; T. Tanaka
Physical Review D - Particles, Fields, Gravitation and Cosmology   87(8)    2013   [Refereed]
K. Chida; T. Arakawa; S. Matsuo; Y. Nishihara; T. Tanaka; D. Chiba; T. Ono; T. Hata; K. Kobayashi; T. Machida
Physical Review B - Condensed Matter and Materials Physics   87(15)    2013   [Refereed]
K. Hayasaki; K. Yagi; T. Tanaka; S. Mineshige
Physical Review D - Particles, Fields, Gravitation and Cosmology   87(4)    2013   [Refereed]
S. Isoyama; R. Fujita; N. Sago; H. Tagoshi; T. Tanaka
Physical Review D - Particles, Fields, Gravitation and Cosmology   87(2)    2013   [Refereed]
Y. Korai; T. Tanaka
Physical Review D - Particles, Fields, Gravitation and Cosmology   87(2)    2013   [Refereed]
A covariant approach to general field space metric in multi-field inflation
J. O. Gong and T. Tanaka
JCAP 1103, 015      Feb 2012   [Refereed]
Modified gravity theory and Gravitational waves
Takahiro Tanaka
Invited, in “PPC2012,” KIAS, Korea, Nov. 2012.      2012   [Refereed]
Evolutionary effects in one-bubble open inflation for string landscape
D. Yamauchi; A. Linde; A. Naruko; M. Sasaki; T. Tanaka
12th Marcel Grossmann Meeting on Recent Dev. in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories - Proc. of the MG 2009 Meeting on General Relativity   2252-2254   2012   [Refereed]
K. Yagi; N. Yunes; T. Tanaka
Physical Review Letters   109(25)    2012   [Refereed]
K. Yagi; N. Yunes; T. Tanaka
Physical Review D - Particles, Fields, Gravitation and Cosmology   86(4)    2012   [Refereed]
K. Yagi; L.C. Stein; N. Yunes; T. Tanaka
Physical Review D - Particles, Fields, Gravitation and Cosmology   85(6)    2012   [Refereed]

Misc

 
Roberto Emparan, Tetsuya Shiromizu, Ryotaku Suzuki, Kentaro Tanabe, Takahiro Tanaka
   Apr 2015
The gravitational field of a black hole is strongly localized near its
horizon when the number of dimensions D is very large. In this limit, we can
effectively replace the black hole with a surface in a background geometry (eg
Minkowski or Anti-de...
Stefano Ansoldi, Takahiro Tanaka
   Oct 2014
The description of quantum tunnelling in the presence of gravity shows
subtleties in some cases. Here we discuss wormhole production in the context of
the spherically symmetric thin-shell approximation. By presenting a fully
consistent treatment b...
Masashi Kimura, Hideki Ishihara, Ken Matsuno, Takahiro Tanaka
   Jul 2014
We propose a simple method to prove non-smoothness of a black hole horizon.
The existence of a Tex extension across the horizon implies that there is no
Tex extension across the horizon if some components of Tex-th covariant
derivative o...
Takahiro Tanaka, Yuko Urakawa
   Feb 2014
It has been claimed that the super Hubble modes of the graviton generated
during inflation can make loop corrections diverge. Even if we introduce an
infrared (IR) cutoff at a comoving scale as an ad hoc but a practical way for
the regularization,...
Yasuho Yamashita, Takahiro Tanaka
   Jan 2014
We discuss whether or not bigravity theory can be embedded into the
braneworld setup. As a candidate, we consider Dvali-Gabadadze-Porrati two-brane
model with the Goldberger-Wise radion stabilization. We will show that we can
construct a ghost fre...
“An easy way to get the gravitational wave templates for Extreme mass ratio inspiral,”
Takahiro Tanaka
Dept. of Phys., Osaka City Univ., Jan. 2013      2013   [Refereed]
“How to test the Einstein gravity using gravitational waves,”
Takahiro Tanaka
ICRR, Feb 2013 (KAGRA F2F meeting)      2013   [Refereed]
“Adiabatic approximation to the gravitational waveform for extreme mass-ratio inspirals,”
Takahiro Tanaka
INR, Moscow, Russia, March 2013      2013   [Refereed]
Infrared Phenomena of Field Theory in de Sitter space
Takahiro Tanaka
Invited, in “Asia-Pacific School on Gravity and Cosmology,” Jeju, Korea, Feb. 2013.      2013   [Refereed]
Gravitational wave oscillations in bigravity theory
Takahiro Tanaka
“TJ2012: Japan/Thai workshop in cosmology,” Pattaya, Thailand, Dec. 2012.      2012   [Refereed]

Conference Activities & Talks

 
"Testing gravity theory using gravitational waves"
TANAKA Takahiro
10 Dec 2018   
"Testing gravity theory using gravitational waves"
TANAKA Takahiro
IBS Workshop on Prospects of Particle Physics and Cosmology   3 Dec 2018   
"Testing gravity theory using gravitational waves"
TANAKA Takahiro
5th Korea-Japan Workshop on Dark Energy: Starobinsky's Universe   6 Aug 2018   
"Gravitational waves from BH mergers as a new probe of physics"
TANAKA Takahiro
AVENUES OF QUANTUM FIELD THEORY IN CURVED SPACETIME   27 Jul 2018   

Research Grants & Projects

 
Braneworld cosmology
Project Year: 1999   
Gravitational Wave from a coalescing binary