J-GLOBAL         Last updated: May 23, 2019 at 12:27
Institute of Particle and Nuclear Studies
Job title
Associate Professor
Ph.D.(The University of Texas at Austin)

Research Interests


Research Areas


Academic & Professional Experience

JSPS Research Fellow


Graduate School, Division of National Science and Technology, The University of Texas at Austin
Faculty of Science, Hokkaido University

Committee Memberships

The Elementary Particle Physics Group in Japan  A Member of The Committee of The Elementary Particle Physics Group in Japan

Published Papers

Makoto Natsuume, Takashi Okamura
Phys. Rev. D 97, 066016 (2018)   97    Jan 2018
We construct an analytic solution for a one-parameter family of holographic
superconductors in asymptotically Lifshitz spacetimes. We utilize this solution
to explore various properties of the systems such as (1) the superfluid phase
background an...
Makoto Natsuume, Takashi Okamura
Phys. Rev. D 95, 106009 (2017)   95    Mar 2017
The Kibble-Zurek (KZ) mechanism describes the generations of topological
defects when a system undergoes a second-order phase transition via quenches.
We study the holographic KZ scaling using holographic superconductors. The
scaling can be unders...
Makoto Natsuume, Takashi Okamura
   Jul 2013
It is known that time-dependent perturbations can enhance superconductivity
and increase the critical temperature. If this phenomenon happens to high-T_c
superconductors, one could obtain room-temperature superconductors, but this is
still an open...
Yoshinori Matsuo, Makoto Natsuume, Masahiro Ohta, Takashi Okamura
   Jun 2012
We study the proposal by Bredberg et al. (1006.1902), where the fluid is
defined by the Brown-York tensor on a timelike surface at r=r_c in black hole
backgrounds. We consider both Rindler space and the Schwarzschild-AdS (SAdS)
black hole. The for...
Makoto Natsuume, Masahiro Ohta
Prog.Theor.Phys.124:931-951,2010      Aug 2010
We study the ratio of the shear viscosity to the entropy density for various
holographic superfluids. For the s-wave case, the ratio has the universal value
1/(4pi) as in various holographic models. For the p-wave case, there are two
shear viscosi...
Makoto Natsuume
Prog.Theor.Phys.Suppl.186:491-497,2010      Jun 2010
We review black holes with second-order phase transition in string theory
(R-charged black holes and holographic superconductors) and review their static
and dynamic critical phenomena. Holographic superconductors have conventional
mean-field valu...
Kengo Maeda, Makoto Natsuume, Takashi Okamura
Phys.Rev.D82:046002,2010      May 2010
In the AdS/CFT duality, it is often said that a local symmetry in a bulk
theory corresponds to a global symmetry in the corresponding boundary theory,
but the global symmetry can become local when one couples with an external
source. As a result, ...
Kengo Maeda, Makoto Natsuume, Takashi Okamura
Phys.Rev.D81:026002,2010      Oct 2009
We investigate the vortex lattice solution in a (2+1)-dimensional holographic
model of superconductors constructed from a charged scalar condensate. The
solution is obtained perturbatively near the second-order phase transition and
is a holographi...
Kengo Maeda, Makoto Natsuume, Takashi Okamura
Phys.Rev.D79:126004,2009      Apr 2009
We study "holographic superconductors" in various spacetime dimensions. We
compute most of the static critical exponents in the linear perturbations and
show that they take the standard mean-field values. We also consider the
dynamic universality ...
Kengo Maeda, Makoto Natsuume, Takashi Okamura
Phys.Rev.D78:106007,2008      Sep 2008
In critical phenomena, singular behaviors arise not only for thermodynamic
quantities but also for transport coefficients. We study this dynamic critical
phenomenon in the AdS/CFT duality. We consider black holes with a single
R-charge in various ...
Makoto Natsuume
Phys.Rev.D78:066010,2008      Jul 2008
We obtain the relaxation time for the shear viscous stress for various
geometries using the "membrane paradigm" formula proposed recently. We consider
the generic Schwarzschild-AdS black holes (SAdS), the generic Dp-brane, the
Klebanov-Tseytlin (K...
Makoto Natsuume
Prog.Theor.Phys.Suppl.174:286-297,2008      Jul 2008
We summarize the main lessons for causal hydrodynamics/second order
hydrodynamics/Israel-Stewart theory from string theory.
Makoto Natsuume, Takashi Okamura
Prog.Theor.Phys.120:1217-1222,2008      Jan 2008
We obtain new transport coefficients of causal hydrodynamics for the M2 and
the M5-brane using a Kubo-like formula proposed by Baier, Romatschke, Son,
Starinets, and Stephanov (arXiv:0712.2451 [hep-th]). The relaxation times agree
with the ones ob...
Makoto Natsuume, Takashi Okamura
Phys.Rev.D77:066014,2008; Erratum-ibid.D78:089902,2008      Dec 2007
We study causal hydrodynamics (Israel-Stewart theory) of gauge theory plasmas
from the AdS/CFT duality. Causal hydrodynamics requires new transport
coefficients (relaxation times) and we compute them for a number of
supersymmetric gauge theories i...
Makoto Natsuume, Takashi Okamura
   Dec 2007
This is a comment to hep-th/0703243. The paper determined the relaxation time
tau_pi of the shear viscous stress for the N=4 SYM from AdS/CFT correspondence.
The purpose of this comment is to point out that the value of tau_pi is 3 times
larger th...
Makoto Natsuume, Takashi Okamura
JHEP 0709:039,2007      Jun 2007
We study the screening length of a heavy quark-antiquark pair in strongly
coupled gauge theory plasmas flowing at velocity v following a proposal by Liu,
Rajagopal, and Wiedemann. We analyze the screening length as the direction of
the plasma wind...
Makoto Natsuume
   Jan 2007
We review the AdS/CFT description of gauge theory plasmas for non-experts. We
discuss the low shear viscosity, jet quenching, and J/psi-suppression, which
are three major signatures for the quark-gluon plasma observed at RHIC
Elena Caceres, Makoto Natsuume, Takashi Okamura
JHEP0610:011,2006      Jul 2006
We study the screening length L_s of a heavy quark-antiquark pair in strongly
coupled gauge theory plasmas flowing at velocity v. Using the AdS/CFT
correspondence we investigate, analytically, the screening length in the
ultra-relativistic limit. ...
Kengo Maeda, Makoto Natsuume, Takashi Okamura
Phys.Rev.D74:046010,2006      May 2006
In AdS/CFT duality, it is often argued that information behind the event
horizon is encoded even in boundary correlators. However, its implication is
not fully understood. We study a simple model which can be analyzed explicitly.
The model is a tw...
Kengo Maeda, Makoto Natsuume, Takashi Okamura
Phys.Rev.D73:066013,2006      Feb 2006
We compute the strong coupling limit of the shear viscosity for the N=4
super-Yang-Mill theory with a chemical potential. We use the five-dimensional
Reissner-Nordstrom-anti-deSitter black hole, so the chemical potential is the
one for the R-charg...
Masako Asano, Mitsuhiro Kato, Makoto Natsuume
JHEP0511:033,2005      Sep 2005
We re-examine physical state representations in the covariant quantization of
bosonic string. We especially consider one parameter family of gauge fixing
conditions for the residual gauge symmetry due to null states (or BRST exact
states), and obt...
Kengo Maeda, Makoto Natsuume, Takashi Okamura
Phys.Rev. D72 (2005) 086012      Sep 2005
The nonextreme Dp-brane solutions in type II supergravity(in the near-horizon
limit) are expected to be dual to (p+1)-dimensional noncompact supersymmetric
Yang-Mills theories at finite temperature. We study the translationally
invariant perturbat...
Masako Asano, Makoto Natsuume
JHEP 0309:018,2003      Apr 2003
In our previous papers, we prove the no-ghost theorem without light-cone
directions (hep-th/0005002, hep-th/0303051). We point out that our results are
valid for more general backgrounds. In particular, we prove the no-ghost
theorem for AdS_3 in t...
Masako Asano, Makoto Natsuume
Nucl.Phys. B672 (2003) 39-63      Mar 2003
It is well-known that the standard no-ghost theorem is valid as long as the
background has the light-cone directions. We prove the no-ghost theorem for the
NSR string when only the timelike direction is flat. This is done by the BRST
Makoto Natsuume
Phys.Rev. D65 (2002) 086002      Nov 2001
The enhancon mechanism is studied in the heterotic string theory. We consider
the N_L=0 winding strings with momentum (NS1-W*) and the Kaluza-Klein dyons
(KK5-NS5*). The NS1-W* and KK5-NS5* systems are dualized to the D4-D0* and
D6-D2* systems, re...
Makoto Natsuume
   Aug 2001
We review the current status of the singularity problem in string theory for
non-experts. After the problem is discussed from the point of view of
supergravity, we discuss classic examples and recent examples of singularity
resolution in string th...
Masako Asano, Makoto Natsuume
Nucl.Phys. B588 (2000) 453-470      Apr 2000
It is well-known that the standard no-ghost theorem can be extended
straightforwardly to the general c=26 CFT on R^{d-1,1} \times K, where 2 \leq d
\leq 26 and K is a compact unitary CFT of appropriate central charge. We prove
the no-ghost theorem...
Makoto Natsuume, Takashi Okamura
Phys.Rev. D62 (2000) 064027      Nov 1999
We propose that Strominger's method to derive the BTZ black hole entropy is
in fact applicable to other asymptotically AdS_3 black holes and gives the
correct functional form of entropies. We discuss various solutions in the
Einstein-Maxwell theor...
Makoto Natsuume, Takashi Okamura, Masamichi Sato
Phys.Rev. D61 (2000) 104005      Oct 1999
Strominger has derived the Bekenstein-Hawking entropy of the BTZ black hole
using asymptotic Virasoro algebra. We apply Strominger's method to a black hole
solution found by Martinez and Zanelli (MZ). This is a solution of
three-dimensional gravit...
Makoto Natsuume, Yuji Satoh
Int.J.Mod.Phys. A13 (1998) 1229-1262      Nov 1996
We investigate the string theory on three dimensional black holes discovered
by Bañados, Teitelboim and Zanelli in the framework of conformal field
theory. The model is described by an orbifold of the Tex WZW
model. The spect...
Makoto Natsuume, Norisuke Sakai, Masamichi Sato
Mod.Phys.Lett. A11 (1996) 1467-1474      Mar 1996
The Tex WZW orbifold describes the (2+1)-dimensional black hole
which approaches anti-de~Sitter space asymptotically. We study the Tex tachyon scattering off the rotating black hole background and
calculate the Hawking tempe...
Makoto Natsuume
Phys.Rev. D50 (1994) 3949-3953      Jun 1994
We study the order Tex correction to the string black hole found by
Garfinkle, Horowitz, and Strominger. We include all operators of dimension up
to four in the Lagrangian, and use the field redefinition technique which
facilitates the analy...
Makoto Natsuume, Joseph Polchinski
Nucl.Phys.B424:137-154,1994      Mar 1994
The Tex matrix model is equivalent to Tex dimensional string theory.
However, the tachyon self-interaction in the former is local, while in the
latter it is nonlocal due to the gravitational, dilaton and higher string
fields. By studying scatt...
Makoto Natsuume
Mod.Phys.Lett. A9 (1994) 2113-2122      Jan 1994
For Tex string theory, the perturbative Tex-matrices are not well-defined
due to a zero mode divergence. Although there exist formal procedures to make
the integral convergent, their physical meanings are unclear. We describe a
method to obtain f...
Makoto Natsuume
   Feb 1993
The similarity between tree-level string theory scalar amplitudes, the
Koba-Nielsen form (Tex) and the Virasoro-Shapiro form (Tex) suggests a
natural Tex generalization for a scalar amplitude. It is shown that the
Tex amplitude sha...


Makoto Natsuume
   Sep 2014
This is the draft/updated version of a textbook on "real-world" applications
of the AdS/CFT duality for beginning graduate students in particle physics and
for researchers in the other fields. The aim of this book is to provide
background material...
28(6) 42-44   Jun 2013
Journal of Japan Society of Fluid Mechanics   31(5) 387-395   Oct 2012
Parity.   24(8) 14-23   Aug 2009
Natsuume Makoto
Butsuri   62(9) 689-694   Sep 2007
According to string theory, there is an intimate relation between a gauge theory and a black hole. Thus, gauge theory plasmas have been studied using black holes. In the meantime, quark-gluon plasma experiments have been done by the RHIC machine a...
原子核研究   52(Supplement 1) 88-95   Sep 2007
Natsuume Makoto
Soryushiron Kenkyu   114(6) F29-F36   Mar 2007
We review the AdS/CFT description of gauge theory plasmas. We discuss the low shear viscosity, the jet quenching, and the J/ψ-suppression, which are three major signatures for the quark-gluon plasma observed at RHIC experiments.
アインシュタインと21世紀の物理学 日本物理学会2004年度科学セミナー 2005年世界物理年へ向けて   117-133   2004
Natsume Makoto
54(3) 178-186   Mar 1999
K. Maeda, M. Natsuume, and T. Okamura
String theory implications on causal hydrodynamics
M. Natsuume
Prog. Theor. Phys. Suppl.   
M. Natsuume
Phys. Rev. D   78(6,Pt.B) 066010   2008
M. Natsuume and T. Okamura
Phys. Rev. D   77 066014
"Unexpected connection" between string theory and quark-gluon plasma
M. Natsuume
Butsuri   62 689   2007
Screening length and the direction of plasma winds
M. Natsuume and T. Okamura
JHEP   09 039   2007
M. Natsuume
Nature Physics   3(5) 297   2007
String theory for heavy-ion physicists
M. Natsuume
Prog. Theor. Phys. Suppl.   168 372   2007
E. Caceres, M. Natsuume, and T. Okamura
JHEP   10 11   2006
K. Maeda, M. Natsuume, and T. Okamura
Phys. Rev. D   74(4) 046010   2006
K. Maeda, M. Natsuume, and T. Okamura
Phys. Rev. D   73(6) 066013   2006
Physical state representations and gauge fixing in string theory (jointly worked)
Journal of High Energy Physics   11(033)    2005
The BRST quantization and the no-ghost theorem for AdS3(jointly worked)
Journal of High Energy Physics   0309(018)    2003
The heterotic enhancon
Physical Review D   65(086002)    2002
The singularity problem in string theory
Frontier of Cosmology and Gravitation      2001
The no-ghost theorem for string theory in curved backgrounds with a flat timelike direction(jointly worked)
Nuclear Physics B   588(453)    2000
Entropy for asymptotically AdS3 black holes(jointly worked)
Physical Review D   62 064027   2000
Three-dimensional gravity with a conformal scalar field and asymptotic Virasoro algebra(jointly worked)
Physical Review D   61(104005)    2000
Can String theory solve the puzzles of black holes?
Butsuri   54(178)    1999
International Journal of Modern Physics A   13(1229)    1998
Gravitational scattering in the C=1 matrix model(jointly worked)
Nuclear Physics B   424(137)    1994
Modern Physics Letters A   9(2113)    1994
Physical Review D   48(2835)    1993

Books etc

Invitation to String Theory
Nikkei BP Co.,Ltd   2008   
Illustrated quantum mechanics
Natsume Shuppan Kikaku Co.,Ltd   2005   
Einstein and 21st Century Physics (jointly worked)
Nippon Hyoron-sha Co.,Ltd   2005   
Gendai Butsuri Saizensen 7 (jointly worked)
Kyoritsu Shuppan Co., Ltd.   2002   
Dynamics of Fields and Strings(jointly edited)
Progress of Theoretical Physics Supplement   1999   


Study on the no-ghost theorem in string theory
Study on asymptotically AdS3 black holes and Virasoro algebra
1998 - 1999
Study on string theory on three-dimensional black holes
1995 - 1996
Black hole spacetimes and finite-temperature gauge theories

Research Grants & Projects

Study on Superstring theory
The Other Research Programs