Singularity crossing, transformation of matter properties and the problem of parametrization in field theories
arXiv:1710.04926 · doi:10.1007/s10701-018-0161-4
Abstract
We investigate particular cosmological models, based either on tachyon fields or on perfect fluids, for which soft future singularities arise in a natural way. Our main result is the description of a smooth crossing of the soft singularity in models with an anti-Chaplygin gas or with a particular tachyon field in the presence of dust. Such a crossing is made possible by certain transformations of matter properties. We discuss and compare also different approaches to the problem of crossing of the Big Bang - Big Crunch singularities.
19 pages, based on a talk given at the International Lemaitre Workshop "Black holes, gravitational waves and spacetime singularities", Specola Vaticana, May 8-12, 2017
References in corpus (7)
- Reconstructing Dark Energy
- Classification of cosmological milestones
- One-loop divergences for gravity non-minimally coupled to a multiplet of scalar fields: calculation in the Jordan frame. I. The main results
- Eternal Universe
- Will the tachyonic Universe survive the Big Brake?
- Bianchi-I cosmological model and crossing singularities
- Field redefinitions, Weyl invariance, and nature of mavericks