Nonsingular Cosmologies from Branes

TL;DR

This paper explores non-singular cosmological models on branes acting as boundaries of black holes in anti-de Sitter or de Sitter spaces, showing how tuning parameters can avoid quantum gravity eras and analyzing universe creation via wave functions.

Contribution

It introduces new brane-world cosmologies that avoid singularities and quantum gravity eras through parameter tuning and studies universe creation using Wheeler-De Witt formalism.

Findings

Many brane scenarios are completely non-singular.

Quantum gravity eras can be avoided by tuning bulk parameters.

The wave function analysis provides insights into brane-universe creation.

Abstract

We analyse possible cosmological scenarios on a brane where the brane acts as a dynamical boundary of various black holes with anti-de Sitter or de Sitter asymptotics. In many cases, the brane is found to describe completely non-singular universe. In some cases, quantum gravity era of the brane-universe can also be avoided by properly tuning bulk parameters. We further discuss the creation of a brane-universe by studying its wave function. This is done by employing Wheeler-De Witt equation in the mini superspace formalism.