Conjecture on the Avoidance of the Big Crunch

TL;DR

This paper proposes a modified cosmological model inspired by string theory and quantum gravity, suggesting a bounce that avoids the big crunch singularity by altering the Hawking temperature and Friedmann equations.

Contribution

It introduces a novel modification to the Hawking temperature and Friedmann equations based on Planck-scale physics, leading to a non-singular bouncing universe.

Findings

Avoids big crunch singularity through modified equations

Proposes a bouncing cosmological model

Links string theory landscape to cosmological evolution

Abstract

KKLT give a mechanism to generate de Sitter vacua in string theory. And recently, the scenario, {\em landscape}, is suggested to explain the problem of the cosmological constant. In this scenario, the cosmological constant is a de Sitter vacuum. The vacuum is metastable and would decay into an anti-de Sitter vacuum finally. Then the catastrophe of the big crunch appears. In this paper by conjecturing the physics at the Planck scale, we modify the definition of the Hawking temperature. Hinted by this modification, we modify the Friedmann equation. we find that this avoid the singularity and gives a bouncing cosmological model.