Born Again Universe
Abstract
We present a class of nonsingular, bouncing cosmologies that evade singularity theorems through the use of vorticity in compact extra dimensions. The vorticity combats the focusing of geodesics during the contracting phase. The construction requires fluids that violate the null energy condition (NEC) in the compact dimensions, where they can be provided by known stable NEC violating sources such as Casimir energy. The four dimensional effective theory contains an NEC violating fluid of Kaluza-Klein excitations of the higher dimensional metric. These spacetime metrics could potentially allow dynamical relaxation to solve the cosmological constant problem. These ideas can also be used to support traversable Lorentzian wormholes.
Cite
@article{arxiv.1709.01999,
title = {Born Again Universe},
author = {Peter W. Graham and David E. Kaplan and Surjeet Rajendran},
journal= {arXiv preprint arXiv:1709.01999},
year = {2018}
}
Comments
12 pages, 1 figure. Minor change to title. Error in Appendix B was corrected