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12 papers · 2 filters
Quantum Aspects of GMS Solutions of Noncommutative Field Theory and Large N Limit of Matrix Models
Gautam Mandal, Soo-Jong Rey, Spenta Wadia
We investigate quantum aspects of Gopakumar-Minwalla-Strominger (GMS) solutions of noncommutative field theory (NCFT) at large noncommutativity limit, . Building upon…
Tachyon Condensation and Black Hole Entropy
Atish Dabholkar
String propagation on a cone with deficit angle is considered for the purpose of computing the entropy of a large mass black hole. The entropy computed using the…
Matrix dynamics of fuzzy spheres
Dileep P. Jatkar, Gautam Mandal, Spenta R. Wadia +1
We study the dynamics of fuzzy two-spheres in a matrix model which represents string theory in the presence of RR flux. We analyze the stability of known static solutions of such a…
Effective Action for D-branes on SU(2)/U(1) Gauged WZW Model
Shahrokh Parvizi
Dynamics of D-branes on gauged WZW model are investigated. We find the effective action for infinite , where is the level of WZW model. We also consider finite…
On Condensation of Closed-string Tachyons
Atish Dabholkar
An F-theory dual of a nonsupersymmetric orientifold is considered. It is argued that the condensation of both open and closed string tachyons in the orientifold corresponds to the…
Disc Instantons in Linear Sigma Models
Suresh Govindarajan, T. Jayaraman, Tapobrata Sarkar
We construct a linear sigma model for open-strings ending on special Lagrangian cycles of a Calabi-Yau manifold. We illustrate the construction for the cases considered by Aganagic…
Star Products from Commutative String Theory
Sunil Mukhi
A boundary-state computation is performed to obtain derivative corrections to the Chern-Simons coupling between a p-brane and the RR gauge potential C(p-3). We work to quadratic or…
Derivative Corrections from Noncommutativity
Sumit R. Das, Sunil Mukhi, Nemani V. Suryanarayana
We show that an infinite subset of the higher-derivative alpha' corrections to the DBI and Chern-Simons actions of ordinary commutative open-string theory can be determined using n…
Unruh Radiation, Holography and Boundary Cosmology
Sumit R. Das, Andrei Zelnikov
A uniformly acclerated observer in anti-deSitter space-time is known to detect thermal radiation when the acceleration exceeds a critical value. We investigate the holographic inte…
Space of kink solutions in SU(N)\times Z_2
Levon Pogosian, Tanmay Vachaspati
We find distinct classes (``generations'') of kink solutions in an field theory. The classes are labeled by an integer . The members of one class of…
Gauge-Invariant Couplings of Noncommutative Branes to Ramond-Ramond Backgrounds
Sunil Mukhi, Nemani V. Suryanarayana
We derive the couplings of noncommutative D-branes to spatially varying Ramond-Ramond fields, extending our earlier results in hep-th/0009101. These couplings are expressed in term…
A class of kinks in SU(N)\times Z_2
Tanmay Vachaspati
In a classical, quartic field theory with symmetry, a class of kink solutions can be found analytically for one special choice of parameters. We construct these…