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- Sang-Jin Sin
- 1998

We show that the D-instanton in the AdS 5 × S 5 background is a wormhole connecting the background AdS 5 × S 5 to the flat space R 10 located at the position of the D-instanton. By a SL(2, R) rotation of type IIB theory, we can make the global geometry flat in string frame. We also find that, due to the tight relation between the dilaton and the axion,… (More)

- Keun-Young Kim, Sang-Jin Sin, Ismail Zahed
- 2008

We consider the diffusion of a non-relativistic heavy quark of fixed mass M , in a one-dimensionally expanding and strongly coupled plasma using the AdS/CFT duality. The Green's function constructed around a static string embedded in a background with a moving horizon, is identified with the noise correlation function in a Langevin approach. The (electric)… (More)

- Edward Shuryak, Sang-Jin Sin, Ismail Zahed
- 2005

In the context of the AdS/CFT correspondence we discuss the gravity dual of a heavy-ion-like collision in a variant of N = 4 SYM. We provide a gravity dual picture of entire process. We estimate the initial entropy and temperature as a function of the initial saturation momentum Q s. We suggest that the cooling of the fireball is the dual of a brane… (More)

We consider a holographic dual of hydrodynamics of N = 4 SYM plasma that undergoes non-isotropic three-dimensional expansion relevant to RHIC fireball. Our model is a natural extension of the Bjorken's one-dimensional expansion, and it describes an elliptic flow whose v 2 and eccentricity are given in terms of anisotropy parameters. Holographic… (More)

- Keun-Young Kim, Sang-Jin Sin, Ismail Zahed
- 2008

In the context of holographic QCD we analyze Sakai-Sugimoto's chiral model at finite baryon density and zero temperature. The baryon number density is introduced through compact D4 wrapping S 4 at the tip of D8-D8. Each baryon acts as a chiral point-like source distributed uniformly over R 3 , and leads a non-vanishing U (1) V potential on the brane. For… (More)

- Keun-Young Kim, Sang-Jin Sin, Ismail Zahed
- 2006

We provide a method to study hadronic matter at finite density in the context of the Sakai-Sugimoto model. We introduce the baryon chemical potential through the external U (1) v in the induced (DBI plus CS) action on the D8-probe-brane, where baryons are skyrmions. Vector dominance is manifest at finite density. We derive the baryon density effect on the… (More)

- Keun-Young Kim, Sang-Jin Sin, Ismail Zahed
- 2008

We investigate dense matter in the context of Sakai and Sugimoto's holographic model of QCD at zero temperature but finite baryon density in the Wigner-Seitz approximation. In bulk, baryons are treated as instantons on S 3 ×R 1 in each Wigner-Seitz cell. At low density, the energy density varies as n 1/3 B while at high density it varies as n 5/3 B. In… (More)

- TCDMATH, Sang-Jin Sin
- 2007

We consider quadratic fluctuations around the tachyon vacuum numerically in open string field theory. We work on a space H vac N spanned by basis string states used in the Schnabl's vacuum solution. We show that the truncated form of the Schnabl's vacuum solution on H vac N is well-behaved in numerical work. The orthogonal basis for the new BRST operator˜Q… (More)

- Sunggeun Lee, Sang-Jin Sin
- 2003

The GSO projection in the twisted sector of orbifold background is sometimes subtle and incompatible descriptions are found in literatures. Here, from the equivalence of partition functions in NSR and GS formalisms, we give a simple rule of GSO projection for the chiral rings of string theory in C r /Z n , r = 1, 2, 3. Necessary constructions of chiral… (More)

- Sang-Jin Sin
- 2002

We discuss the localized tachyon condensation in the non-supersymmetric orbifold theories by taking the cosmological constant as the measure of degrees of freedom (d.o.f). We first show asymptotic density of state is not a proper quantity to count the 'localized' d.o.f. We then show that localized d.o.f lead us a c-function given by the lightest tachyon… (More)