Galileons, phantom fields, and the fate of the Universe

Abstract

In this paper we study cosmological dynamics of phantom as well as non-phantom fields with linear potential in presence of Galileon correction $({\partial }_{\mu }\varphi {\partial }^{\mu }\varphi )\square \varphi$. We show that the Big Crunch singularity is delayed compared to the standard case; the delay crucially depends upon the strength of Galileon correction. As for the phantom Galileon, ${\rho }_{\varphi }$ is shown to grow more slowly compared to the standard phantom delaying the approach to singularity. In case, $V\sim {\varphi }^n,n>4$, Big Rip is also delayed, similar phenomenon is shown to take place for potentials steeper than the exponential.

10 pages, 3 figures, Accepted for publication in Eur. Phys. J. C

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