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- David Kutasov, Andrei Parnachev, David A Sahakyan
- 2003

We use recent results of Intriligator and Wecht [1] to study the phase structure of N = 1 super Yang-Mills theory with gauge group SU (N c), a chiral superfield in the adjoint, and N f chiral superfields in the fundamental representation of the gauge group. Our discussion sheds new light on [1] and supports the conjecture that the central charge a decreases… (More)

- David A Sahakyan
- 2004

We study the properties of a D-brane in the presence of k NS5 branes. The Dirac-Born-Infeld action describing the dynamics of this D-brane is very similar to that of a non-BPS D-brane in ten dimensions. As the D-brane approaches the fivebranes, its equation of state approaches that of a pressureless fluid. In non-BPS D-brane case this is considered as an… (More)

The low energy dynamics of a certain D-brane configuration in string theory is described at weak t'Hooft coupling by a nonlocal version of the Nambu-Jona-Lasinio model. We study this system at finite temperature and strong t'Hooft coupling, using the string theory dual. We show that for sufficiently low temperatures chiral symmetry is broken, while for… (More)

- Ofer Aharony, Bartomeu Fiol, David Kutasov, David A Sahakyan
- 2003

Little String Theory (LST) is a still somewhat mysterious theory that describes the dynamics near a certain class of time-like singularities in string theory. In this paper we discuss the topological version of LST, which describes topological strings near these sin-gularities. For 5 + 1 dimensional LSTs with sixteen supercharges, the topological version… (More)

We investigate the relation between the algebraic construction of boundary states in AdS 3 and the target space analysis of D-branes and show the consistency of the two descriptions. We compute, in the semiclassical regime, the overlap of a localized closed string state with boundary states and identify the latter with D-branes wrapping conjugacy classes in… (More)

- Andrei Parnachev, David A Sahakyan, C N Yang
- 2006

We consider a D4 − D8 − D8 brane construction which gives rise to a large N QCD at sufficiently small energies. Using the gravity dual of this system, we study chiral phase transition at finite chemical potential and temperature and find a line of first order phase transitions in the phase plane. We compute the spectral function and the photon emission… (More)

We consider corrections to the Penrose limit of AdS 3 × S 3 with NS-NS flux which are due to the terms next to leading order in inverse radius expansion. The worldsheet theory of a lightcone string is interacting due to the presence of quartic terms in the action. Perturbative corrections to the spectrum are shown to agree with the results from the exact… (More)

- Maximilian Kreuzer, Erwin Riegler, David A Sahakyan
- 2001

It has been shown by Batyrev and Borisov that nef partitions of reflexive polyhedra can be used to construct mirror pairs of complete intersection Calabi–Yau manifolds in toric ambient spaces. We construct a number of such spaces and compute their cohomological data. We also discuss the relation of our results to complete intersections in weighted… (More)

- Anatoly Konechny, Andrei Parnachev, David A Sahakyan
- 2005

We study the N = 2 string theory or the N = 4 topological string on the deformed CHS background. That is, we consider the N = 2 minimal model coupled to the N = 2 Liouville theory. This model describes holographically the topological sector of Little String Theory. We use degenerate vectors of the respective N = 2 Verma modules to find the set of BRST… (More)

An interesting case of string/black hole transition occurs in two-dimensional non-critical string theory dressed with a compact CFT. In these models the high energy densities of states of perturbative strings and black holes have the same leading behavior when the Hawking temperature of the black hole is equal to the Hagedorn temperature of pertur-bative… (More)

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