Do supernovae favor tachyonic Big Brake instead de Sitter?
General Relativity and Quantum Cosmology
2010-08-05 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
We investigate whether a tachyonic scalar field, encompassing both dark energy and dark matter-like features will drive our universe towards a Big Brake singularity or a de Sitter expansion. In doing this it is crucial to establish the parameter domain of the model, which is compatible with type Ia supernovae data. We find the 1-sigma contours and evolve the tachyonic sytem into the future. We conclude, that both future evolutions are allowed by observations, Big Brake becoming increasingly likely with the increase of the positive model parameter k.
Keywords
Cite
@article{arxiv.0910.3887,
title = {Do supernovae favor tachyonic Big Brake instead de Sitter?},
author = {L. Á. Gergely and Z. Keresztes and A. Yu. Kamenshchik and V. Gorini and U. Moschella},
journal= {arXiv preprint arXiv:0910.3887},
year = {2010}
}
Comments
8 pages, 6 figures, to be published in the Proceedings of the Invisible Universe International Conference, Paris, 2009, Ed. J. M. Alimi; v2: references