Chaplygin Gas of Tachyon Nature Imposed by Symmetry and Constrained via H(z) Data
arXiv:1505.00474 · doi:10.1088/1674-4527/16/4/066
Abstract
An action of general form is proposed for a Universe containing matter, radiation and dark energy. The latter is interpreted as a tachyon field non-minimally coupled to the scalar curvature. The Palatini approach is used when varying the action so the connection is given by a more generic form. Both the self-interaction potential and the non-minimally coupling function are obtained by constraining the system to present invariability under global point transformation of the fields (Noether Symmetry). The only possible solution is shown to be that of minimal coupling and constant potential (Chaplygin gas). The behavior of the dynamical properties of the system is compared to recent observational data, which infers that the tachyon field must indeed be dynamical.
References in corpus (10)
- Planck 2013 results. I. Overview of products and scientific results
- Three thermodynamically-based parametrizations of the deceleration parameter
- Cosmological constraints on a decomposed Chaplygin gas
- Tachyon warm inflationary universe models
- Tachyonic Quintessential Inflation
- Observational Constraints on Modified Chaplygin Gas from Cosmic Growth
- Cosmological constraints on generalized Chaplygin gas model: Markov Chain Monte Carlo approach
- Tachyon-Chaplygin inflationary universe model
- Tachyon field in Loop Quantum Cosmology: inflation and evolution picture
- Tachyonic open inflationary universes