Sang-Jin Sin

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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)
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)
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)
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)
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)