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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(Nc), a chiral superfield in the adjoint, and Nf 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)

- 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)

- Andrei Parnachev, David A Sahakyan
- Physical review letters
- 2006

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)

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)

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 AdS3×S 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)

- D. Kutasov, D. A. Sahakyan
- 2008

We study the high energy thermodynamics of Little String Theory, using its holographic description. This leads to the entropy-energy relation S = βHE + α logE + O(1/E). We compute α and show that it is negative; as a consequence, the high energy thermodynamics is unstable. We exhibit a mode localized near the horizon of the black brane, which has winding… (More)

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)

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)

- O M Khudaverdian, D A Sahakyan
- 1999

O.M. Khudaverdian Laboratory of Computing Technique and Automation, Joint Institute for Nuclear Research Dubna, Moscow Region 141980, Russia, on leave of absence from Department of Theoretical Physics of Yerevan State University, 375049 Yerevan, Armenia e-mails: ”khudian@vxjinr.jinr.ru”, ”khudian@sc2a.unige.ch” D.A. Sahakyan Department of Theoretical… (More)