Do supernovae favor tachyonic Big Brake instead de Sitter?

Details Do supernovae favor tachyonic Big Brake instead de Sitter? Do supernovae favor tachyonic Big Brake instead de Sitter?

2009-10-20

arxiv.org/abs/0910.3887v2

AIP Conf.Proc.1241:884-891,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, 6 figures, to be published in the Proceedings of the Invisible Universe International Conference, Paris, 2009, Ed. J.

Scientific paper

10.1063/1.3462729

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.

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