arXiv subjects

Srikumar Sen Gupta

Publications and source records attributed to Srikumar Sen Gupta.

2 recordsLinked to original sources

arXiv2013

Some New Light-cone Time Dependent Solutions in Deformed pp-wave Backgrounds

Brane solutions in time \ light-cone time dependent backgrounds are of interest in order to gain a deeper understanding of the physics associated with cosmological and null singularities. In this paper, we report both brane solutions and their bound states in light-cone time dependent pp wave-like backgrounds. We show that the backgrounds our solutions live in are all cosmologically singular (lightlike) at the classical level. A spacetime supersymmetry analysis of the backgrounds reveals that they retain 1/8 of the full type IIB supersymmetry.

hep-th↗

arXiv2007

Brane Solutions in Time Dependent Backgrounds in D = 11 Supergravity and in Type II String Theories

We obtain explicit time dependent brane solutions in M-theory as well as in string theory by solving the reduced equations of motion (which follow from 11-d supergravity) for a class of brane solutions in curved backgrounds. The behaviour of our solutions in both asymptotic and near-horizon limits are studied. It is shown that our time dependent solutions serve as explicit examples of branes in singular, cosmological backgrounds. In some special cases the asymptotic and the boundary AdS solutions can be identified as Milne X R^n spacetime.

hep-th↗