Abstract
We investigate classically nonsingular bounces caused by dark energy. In the presence of positive spatial curvature, vacuum energy, either in the form of a cosmological constant or a scalar field potential, allows for an open set of initial conditions leading to nonsingular bounces, without any violation of the null energy condition. We study anisotropic Bianchi IX cosmologies and demonstrate that they can even have multiple bounces, accompanied by intricate evolutions of the anisotropies that provide a nonsingular analogue of mixmaster crunches. The relation of these solutions to more complete cosmological models, as well as to the recently proposed swampland criteria, are briefly discussed.
6 More- Received 12 February 2019
DOI:https://doi.org/10.1103/PhysRevD.99.123523
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society