D-branes and Cosmological Singularities

TL;DR

This paper investigates how the motion of a test Dq-brane within a Dp-brane background can model cosmological evolution, providing insights into resolving singularities and early universe matter content.

Contribution

It introduces a method to interpret the induced metric on a test brane as cosmology, demonstrating singularity resolution and modeling early universe conditions.

Findings

Resolved cosmological singularities using brane dynamics

Modeled a 3+1D FRW universe with stiff matter equation of state

Suggested early universe was dominated by this matter form

Abstract

The motion of a test Dq-brane in a Dp-brane background is studied. The induced metric on the test brane is then interpreted as the cosmology of the test brane universe. One is then able to resolve the resulting cosmological singularities. In particular, for a D3-brane in a D5-brane background, one finds a 3+1 dimensional FRW universe with equation of state $p = \ed$. It has been argued that this may have been the dominant form of matter at very early times.