Collapse driven by a scalar field without final singularity
Abstract
We explore a collapsing cosmology driven by a scalar field which is minimally coupled to gravity in a spatially flat and spherically symmetric, isotropic and homogeneous space-time, with a variable timescale that avoid the final singularity. The equation of state that describes the collapse is ω = 1. We calculate the back-reaction of the space-time during the collapse and the energy density fluctuations related to this back-reaction has a spectral index ns = 0, favoring short-wavelengths modes to be detected. The interesting is that the amplitude of these fluctuations increase with time when the collapse is sufficiently strong.
- Publication:
-
Physics of the Dark Universe
- Pub Date:
- January 2019
- DOI:
- 10.1016/j.dark.2018.100251
- arXiv:
- arXiv:1810.07385
- Bibcode:
- 2019PDU....23..251H
- Keywords:
-
- General Relativity and Quantum Cosmology
- E-Print:
- 11 pages, no figures