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28 March 2024
 
  » arxiv » 1009.0776

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Will the tachyonic Universe survive the Big Brake?
Zoltán Keresztes ; László Á. Gergely ; Alexander Yu. Kamenshchik ; Vittorio Gorini ; David Polarski ;
Date 3 Sep 2010
AbstractWe investigate a Friedmann universe filled with a tachyon scalar field, which behaves as dustlike matter in the past, while it is able to accelerate the expansion rate of the universe at late times. The comparison with type Ia supernovae (SNIa) data allows for evolutions driving the universe into a Big Brake. Some of the evolutions leading to a Big Brake exhibit a large variation of the equation of state parameter at low redshifts which is potentially observable with future data though hardly detectable with present SNIa data. The soft Big Brake singularity occurs at finite values of the scale factor, vanishing energy density and Hubble parameter, but diverging deceleration and infinite pressure. We show that the geodesics can be continued through the Big Brake and that our model universe will recollapse eventually in a Big Crunch. Although the time to the Big Brake strongly depends on the present values of the tachyonic field and its time derivative, the time from the Big Brake to the Big Crunch represents an invariant timescale for all field parameters allowed by SNIa.
Source arXiv, 1009.0776
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