Stable, non-singular bouncing universe with only a scalar mode
General Relativity and Quantum Cosmology
2020-07-28 v1 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
In this paper, we study a class of higher derivative, non-local gravity which admits homogeneous and isotropic non-singular, bouncing universes in the absence of matter. At the linearized level, the theory propagates only a scalar degree of freedom, and no vector or tensor modes. The scalar can be made free from perturbative ghost instabilities, and has oscillatory and bounded evolution across the bounce.
Cite
@article{arxiv.2005.01762,
title = {Stable, non-singular bouncing universe with only a scalar mode},
author = {K. Sravan Kumar and Shubham Maheshwari and Anupam Mazumdar and Jun Peng},
journal= {arXiv preprint arXiv:2005.01762},
year = {2020}
}
Comments
5 pages, 1 figure