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24 papers · 2 filters
Supergravity couplings to Noncommutative Branes, Open Wilson Lines and Generalised Star Products
S. R. Das, S. P. Trivedi
Noncommutative gauge theories can be constructed from ordinary gauge theories in lower dimensions. Using this construction we identify the operators on noncommutative D…
Matrix Model, Noncommutative Gauge Theory and the Tachyon Potential
Gautam Mandal, Spenta R. Wadia
The D2brane-anti-D2brane system is described in the framework of BFSS Matrix model and noncommutative (NC) gauge theory. The physical spectrum of fields is found by appropriate gau…
Stable Non-BPS States and Their Holographic Duals
Sunil Mukhi, Nemani V. Suryanarayana
Stable non-BPS states can be constructed and studied in a variety of contexts in string theory. Here we review some interesting constructions that arise from suspended and wrapped…
Open Wilson Lines in Noncommutative Gauge Theory and Tomography of Holographic Dual Supergravity
Sumit Das, Soo-Jong Rey
We study the issue of gauge-invariant observables in d=4, N=4 noncommutative gauge theory and UV-IR relation therein. We show that open Wilson lines form a complete set of gauge in…
Vibration modes of giant gravitons
Sumit R. Das, Antal Jevicki, Samir D. Mathur
We examine the spectrum of small vibrations of giant gravitons, when the gravitons expand in the anti-de-Sitter space and when they expand on the sphere. For any given angular harm…
On Link Invariants and Topological String Amplitudes
P. Ramadevi, Tapobrata Sarkar
We explicitly show that the new polynomial invariants for knots, upto nine crossings, agree with the Ooguri-Vafa conjecture relating Chern-Simons gauge theory to topological string…
Chern-Simons Terms on Noncommutative Branes
Sunil Mukhi, Nemani V. Suryanarayana
We write down couplings of the fields on a single BPS Dp-brane with noncommutative world-volume coordinates to the RR-forms in type II theories, in a manifestly background independ…
Magnetic Moments of Branes and Giant Gravitons
S. R. Das, S. P. Trivedi, S. Vaidya
We study the magnetic analogue of Myers' Dielectric Effect and, in some cases, relate it to the blowing up of particles into branes, first investigated by Greevy, Susskind and Toum…
A Note on Gauge Invariant Operators in Noncommutative Gauge Theories and the Matrix Model
Avinash Dhar, Spenta R. Wadia
In this note we discuss local gauge-invariant operators in noncommutative gauge theories. Inspired by the connection of these theories with the Matrix model, we give a simple const…
Giant Gravitons, BPS bounds and Noncommutativity
Sumit R. Das, Antal Jevicki, Samir D. Mathur
It has been recently suggested that gravitons moving in spacetimes along the blow up into spherical branes whose radius increases with increasing a…
On D-branes from Gauged Linear Sigma Models
Suresh Govindarajan, T. Jayaraman, Tapobrata Sarkar
We study both A-type and B-type D-branes in the gauged linear sigma model by considering worldsheets with boundary. The boundary conditions on the matter and vector multiplet field…
Noncritical Strings, RG Flows and Holography
Avinash Dhar, Spenta R. Wadia
We derive an RG flow equation that is satisfied by the regularized partition function for noncritical strings in background fields. The flow refers to change in the position of a `…
Lectures on the Microscopic Modeling of the 5-dim. Black Hole of IIB String Theory and the System
Spenta R. Wadia
In these notes we review the theory of the microscopic modeling of the 5-dim. black hole of type IIB string theory in terms of the brane system. The emphasis here is more o…
Nielsen-Olesen Vortices in Noncommutative Abelian Higgs Model
Dileep P. Jatkar, Gautam Mandal, Spenta R. Wadia
We construct Nielsen-Olesen vortex solution in the noncommutative abelian Higgs model. We derive the quantized topological flux of the vortex solution. We find that the flux is int…
Fuzzy Cosets and their Gravity Duals
Sandip P. Trivedi, Sachindeo Vaidya
Dp-branes placed in a certain external RR (p+4)-form field expand into a transverse fuzzy two-sphere, as shown by Myers. We find that by changing the (p+4)-form background other fu…
Gauge Theory on a Quantum Phase Space
Luis Alvarez-Gaume, Spenta R. Wadia
In this note we present a operator formulation of gauge theories in a quantum phase space which is specified by a operator algebra. For simplicity we work with the Heisenberg algeb…
A Note on Supergravity Duals of Noncommutative Yang-Mills Theory
Sumit R. Das, Banhiman Ghosh
A class of supergravity backgrounds have been proposed as dual descriptions of strong coupling large-N noncommutative Yang-Mills (NCYM) theories in 3+1 dimensions. However calculat…
Supergravity Description of Non-BPS Branes
Philippe Brax, Gautam Mandal, Yaron Oz
We construct supergravity solutions that correspond to N Dp-branes coinciding with \bar{N} \bar{Dp}-branes. We study the physical properties of the solutions and analyse the superg…
D-brane gauge theories from toric singularities of the form and
Tapobrata Sarkar
We discuss examples of D-branes probing toric singularities, and the computation of their world-volume gauge theories from the geometric data of the singularities. We consider seve…
On the Moduli Space of the Localized 1-5 System
Donald Marolf, Sumati Surya
We calculate the effective action for small velocity scattering of localized 1-branes and 5-branes. Momentum is allowed to flow in the direction along the 1-branes so that the modu…
Noncommutative Tachyons
Keshav Dasgupta, Sunil Mukhi, Govindan Rajesh
When unstable Dp-branes in type II string theory are placed in a B-field, the resulting tachyonic world-volume theory becomes noncommutative. We argue that for large noncommutativi…
A Stable Non-BPS Configuration From Intersecting Branes and Antibranes
Sunil Mukhi, Nemani V. Suryanarayana
We describe a tachyon-free stable non-BPS brane configuration in type IIA string theory. The configuration is an elliptic model involving rotated NS5 branes, D4 branes and anti-D4…
Constructing Classical and Quantum Superconformal Algebras on the Boundary of AdS_3
Jorgen Rasmussen
Motivated by recent progress on the correspondence between string theory on anti-de Sitter space and conformal field theory, we address the question of constructing space-time N ex…
Horizon States for AdS Black Holes
T. R. Govindarajan, V. Suneeta, S. Vaidya
We study the time-independent modes of a massless scalar field in various black hole backgrounds, and show that for these black holes, the time-independent mode is localised at the…