Time-dependent supergravity solutions in null dilaton background
Rashmi R. Nayak, Kamal L. Panigrahi, Sanjay Siwach
TL;DR
This paper explores time-dependent supergravity solutions in a null dilaton background, modeling early universe cosmology with fluxes and analyzing D-brane dynamics and supersymmetry.
Contribution
It introduces new time-dependent supergravity solutions in null dilaton backgrounds and examines their supersymmetry and cosmological implications.
Findings
Preserves 1/4 supersymmetry in the background.
Models Big Bang cosmology with non-trivial flux.
Constructs supergravity solutions for D-branes.
Abstract
A class of time dependent pp-waves with NS-NS flux in type IIA string theory is considered. The background preserves 1/4 supersymmetry and may provide a toy model of Big Bang cosmology with non trivial flux. At the Big Bang singularity in early past, the string theory is strongly coupled and Matrix string model can be used to describe the dynamics. We also construct some time dependent supergravity solutions for D-branes and analyze their supersymmetry properties.
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