Bouncing Cosmologies: Progress and Problems
Abstract
We review the status of bouncing cosmologies as alternatives to cosmological inflation for providing a description of the very early universe, and a source for the cosmological perturbations which are observed today. We focus on the motivation for considering bouncing cosmologies, the origin of fluctuations in these models, and the challenges which various implementations face.
- Publication:
-
Foundations of Physics
- Pub Date:
- June 2017
- DOI:
- 10.1007/s10701-016-0057-0
- arXiv:
- arXiv:1603.05834
- Bibcode:
- 2017FoPh...47..797B
- Keywords:
-
- Ekpyrotic Scenario;
- Matter Bounce;
- Scale-invariant Spectrum;
- Cosmological Fluctuations;
- super-Hubble Scales;
- High Energy Physics - Theory;
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- General Relativity and Quantum Cosmology;
- High Energy Physics - Phenomenology
- E-Print:
- 30 pages, 6 figures