English

Anisotropic multiple bounce models

General Relativity and Quantum Cosmology 2017-07-26 v2

Abstract

We analyze the Galileon ghost condensate implementation of a bouncing cosmological model in the presence of a non negligible anisotropic stress. We exhibit its structure, which we find to be far richer than previously thought. In particular, even restricting attention to a single set of underlying microscopic parameters, we obtain, numerically, many qualitatively different regimes: depending on the initial conditions on the scalar field leading the dynamics of the universe, the contraction phase can evolve directly towards a singularity, avoid it by bouncing once, or even bounce many times before settling into an ever-expanding phase. We clarify the behavior of the anisotropies in these various situations.

Keywords

Cite

@article{arxiv.1705.04602,
  title  = {Anisotropic multiple bounce models},
  author = {Anna Paula Bacalhau and Patrick Peter and Sandro D. P. Vitenti},
  journal= {arXiv preprint arXiv:1705.04602},
  year   = {2017}
}

Comments

11 pages, 9 figures, minor corrections

R2 v1 2026-06-22T19:45:28.184Z