233 citations · 1k across the 39 of their papers we have counts for
30 papers · 1 filter
On the Exchange Interactions in Holographic p-adic CFT
Parikshit Dutta, Debashis Ghoshal, Arindam Lala
There is a renewed interest in conformal field theories (CFT) on ultrametric spaces (p-adic field and its algebraic extensions) in view of their natural adaptability in the hologra…
Stability of the Travelling Front of a Decaying Brane
Debashis Ghoshal, Preeda Patcharamaneepakorn
The dynamics (in light-cone time) of the tachyon on an unstable brane in the background of a dilaton linear along a null coordinate is a non-local reaction-diffusion type equation,…
Weak Coupling Expansion of Yang-Mills Theory on Recursive Infinite Genus Surfaces
Debashis Ghoshal, Camillo Imbimbo, Dushyant Kumar
We analyze the partition function of two dimensional Yang-Mills theory on a family of surfaces of infinite genus. These surfaces have a recursive structure, which was used by one o…
Travelling Front of a Decaying Brane in String Field Theory
Debashis Ghoshal, Preeda Patcharamaneepakorn
We consider the inhomogeneous decay of an unstable D-brane of bosonic string theory in a linear dilaton background in a light-cone frame. At the lowest level, the dynamical equatio…
Fisher Equation for a Decaying Brane
Debashis Ghoshal
We consider the inhomogeneous decay of an unstable D-brane. The dynamical equation that describes this process (in light-cone time) is a variant of the non-linear reaction-diffusio…
Contour Integral Representations for the Characters of Logarithmic CFTs
Arjun Bagchi, Turbasu Biswas, Debashis Ghoshal
We propose a contour integral representation for the one-point correlators at genus one of the primaries of a family of rational logarithmic conformal field theories.
Generalised HyperKaehler Manifolds in String Theory
Bobby Ezhuthachan, Debashis Ghoshal
We discuss the notion of generalised hyperKaehler structure in the context of string theory and discuss examples of this geometry.
On the relation between p-adic and ordinary strings
Debashis Ghoshal
The amplitudes for the tree-level scattering of the open string tachyons, generalised to the field of p-adic numbers, define the p-adic string theory. There is empirical evidence o…
Towards p-Adic String in Constant B-Field
Debashis Ghoshal, Teruhiko Kawano
Spacetime properties of the tachyon of the p-adic string theory can be derived from a (non-local) action on the p-adic line Q_p, thought of as the boundary of the `worldsheet'. We…
Exact noncommutative solitons in p-adic strings and BSFT
Debashis Ghoshal
The tachyon field of p-adic string theory is made noncommutative by replacing ordinary products with noncommutative products in its exact effective action. The same is done for the…
Liouville D-branes in Two-Dimensional Strings and Open String Field Theory
Debashis Ghoshal, Sunil Mukhi, Sameer Murthy
We study open strings in the noncritical bosonic string theory compactified on a circle at self-dual radius. These strings live on D-branes that are extended along the Liouvi…
NS Fivebrane and Tachyon Condensation
Debashis Ghoshal, Dileep P. Jatkar, Maximilian Kreuzer
We argue that a semi-infinite D6-brane ending on an NS5-brane can be obtained from the condensation of the tachyon on the unstable D9-brane of type IIA theory. The construction use…
Hybrid Inflation and Brane-Antibrane System
Debajyoti Choudhury, Debashis Ghoshal, Dileep P. Jatkar +1
We study a string theory inspired model for hybrid inflation in the context of a brane-antibrane system partially compactified on a compact submanifold of (a caricature of) a Calab…
On the Cosmological Relevance of the Tachyon
Debajyoti Choudhury, Debashis Ghoshal, Dileep P. Jatkar +1
We analyse of the effective action of the tachyon field on a D-brane, of both bosonic as well as superstring theory. We find that the non-standard kinetic term of the tachyon field…
Normalization of the Boundary Superstring Field Theory Action
Debashis Ghoshal
The normalization of the boundary superstring field theory action is determined by computing the near on-shell amplitude involving three gauge fields.
Normalization of the Background Independent Open String Field Theory Action
Debashis Ghoshal, Ashoke Sen
It has been shown recently that the background independent open string field theory provides an exact description of the tachyon condensation on unstable D-branes of bosonic string…
Tachyon Condensation and Brane Descent Relations in p-adic String Theory
Debashis Ghoshal, Ashoke Sen
It has been conjectured that an extremum of the tachyon potential of a bosonic D-brane represents the vacuum without any D-brane, and that various tachyonic lump solutions represen…
Wilson loop via AdS/CFT duality
Stefan Forste, Debashis Ghoshal, Stefan Theisen
The Wilson loop in N=4 supersymmetric Yang-Mills theory admits a dual description as a macroscopic string configuration in the adS/CFT correspondence. We discuss the correction to…
Stringy Corrections to the Wilson Loop in N=4 Super Yang-Mills Theory
Stefan Forste, Debashis Ghoshal, Stefan Theisen
We study stringy fluctuations as a source for corrections to the Wilson loop as obtained from the superstrings on (adS_5 x S^5)/ N=4 SYM correspondence. We give a formal expression…
Strings from Orientifolds
Stefan Forste, Debashis Ghoshal
We construct models in 1+1 dimensions with chiral (0,N) supersymmetry by taking orientifolds of type IIB on an eight-torus identified by different numbers of reflections. The resul…
An orientifold of the solitonic fivebrane
Stefan Forste, Debashis Ghoshal, Sudhakar Panda
We study an orientifold of the solitonic fivebrane of type II string theory. The consideration is restricted to a space-time domain which can be described by an exact conformal fie…
Notes on a singular Landau-Ginzburg family
Debashis Ghoshal
We study some properties of a singular Landau-Ginzburg family characterized by the multi-variable superpotential . We will…
c=1 String as the Topological Theory of the Conifold
Debashis Ghoshal, Cumrun Vafa
We show that the non-critical string at the self-dual radius is equivalent to topological strings based on the deformation of the conifold singularity of Calabi-Yau threefold…
Antibracket as the Hamiltonian Structure of a classical integrable system
Debashis Ghoshal, Sudhakar Panda
The time evolution in a supersymmetric extension of the Kodomtsev-Petviashvilli hierarchy, a classical integrable system, is shown to be Hamiltonian. The canonical bracket associat…