Makoto Natsuume

Universality class of holographic superconductors (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...

Dynamic critical phenomena in the AdS/CFT duality (2008)

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...

Causal hydrodynamics and the membrane paradigm (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...

String theory implications on causal hydrodynamics (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...

A note on causal hydrodynamics for M-theory branes (2008)

We summarize the main lessons for causal hydrodynamics/second order hydrodynamics/Israel-Stewart theory from string theory.

Causal hydrodynamics of gauge theory plasmas from AdS/CFT duality (2007)

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...

Comment on "Viscous hydrodynamics relaxation time from AdS/CFT correspondence" (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...

Screening length and the direction of plasma winds (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...

String theory and quark-gluon plasma (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 in plasma winds (2006)

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...

Caceres, Elena, Natsuume, Makoto, Okamura, Takashi

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...

Extracting information behind the veil of horizon (2006)

Viscosity of gauge theory plasma with a chemical potential from AdS/CFT correspondence (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...

Physical state representations and gauge fixing in string theory (2005)

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...

Asano, Masako, Kato, Mitsuhiro, Natsuume, Makoto

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...

Quasinormal modes for nonextreme Dp-branes and thermalizations of super-Yang-Mills theories (2005)

The BRST quantization and the no-ghost theorem for AdS_3 (2003)

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....

Asano, Masako, Natsuume, Makoto

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...

The no-ghost theorem in curved backgrounds with a timelike u(1): NSR string (2003)

Asano, Masako, Natsuume, Makoto

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...

The Heterotic Enhancon (2001)

The singularity problem in string theory (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...

The no-ghost theorem for string theory in curved backgrounds with a flat timelike direction (2000)

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...

Asano, Masako, Natsuume, Makoto

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...

Entropy for Asymptotically AdS_3 Black Holes (1999)

Three-Dimensional Gravity with Conformal Scalar and Asymptotic Virasoro Algebra (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...

Natsuume, Makoto, Okamura, Takashi, Sato, Masamichi

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...

The five-dimensional Kaluza-Klein electric dipole and brane -- anti-brane pairs (1999)

String theory on three dimensional black holes (1996)

This paper has been withdrawn for revision, due to misinterpretations of the results.

Natsuume, Makoto, Satoh, Yuji

We investigate the string theory on three dimensional black holes discovered by Ba\~{n}ados, Teitelboim and Zanelli in the framework of conformal field theory. The model is described by an orbifold...

String scattering off the (2+1)-dimensional rotationg black hole (1996)

Natsuume, Makoto, Sakai, Norisuke, Sato, Masamichi

The $SL(2, R)/Z$ WZW orbifold describes the (2+1)-dimensional black hole which approaches anti-de~Sitter space asymptotically. We study the $1 \rightarrow 1$ tachyon scattering off the rotating black...

Higher Order Correction to the GHS String Black Hole (1994)

Gravitational Scattering in the c = 1 Matrix Model (1994)

We study the order $\alpha'$ 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...

Natsuume, Makoto, Polchinski, Joseph

The $c=1$ matrix model is equivalent to $1+1$ dimensional string theory. However, the tachyon self-interaction in the former is local, while in the latter it is nonlocal due to the gravitational,...

Zero Mode Divergence Problem in String Theory (1994)

Natural Generalization of Bosonic String Amplitudes (1993)

For $2D$ string theory, the perturbative $S$-matrices are not well-defined due to a zero mode divergence. Although there exist formal procedures to make the integral convergent, their physical...