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Criticality and Big Brake singularities in the tachyonic evolutions of closed Friedmann universes with cold dark matter

Authors :
Horváth, Zsolt
Keresztes, Zoltán
Kamenshchik, Alexander Yu.
Gergely, László Á.
Source :
Phys. Rev. D 91, 103513 (2015)
Publication Year :
2015

Abstract

The evolution of a closed Friedmann universe filled by a tachyon scalar field with a trigonometric potential and cold dark matter (CDM) is investigated. A subset of the evolutions consistent to 1$\sigma $ confidence level with the Union 2.1 supernova data set is identified. The evolutions of the tachyon field are classified. Some of them evolve into a de Sitter attractor, while others proceed through a pseudo-tachyonic regime into a sudden future singularity. Critical evolutions leading to Big Brake singularities in the presence of CDM are found and a new type of cosmological evolution characterized by singularity avoidance in the pseudo-tachyon regime is presented.<br />Comment: 7 pages, 5 figures, to be published in Phys. Rev. D

Details

Database :
arXiv
Journal :
Phys. Rev. D 91, 103513 (2015)
Publication Type :
Report
Accession number :
edsarx.1505.00228
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevD.91.103513