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.
Do supernovae favor tachyonic Big Brake instead de Sitter? / L.A. Gergely; Z. Keresztes; A.Yu. Kamenshchik; V. Gorini; U. Moschella. - STAMPA. - 1241:(2010), pp. 884-891. (Intervento presentato al convegno INVISIBLE UNIVERSE INTERNATIONAL CONFERENCE: Toward a new cosmological paradigm tenutosi a Paris, France nel 29 Jun - 3 Jul 2009) [10.1063/1.3462729].
Do supernovae favor tachyonic Big Brake instead de Sitter?
KAMENCHTCHIK, ALEXANDR;
2010
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
