Nonlocal String Tachyon as a Model for Cosmological Dark Energy

Details Nonlocal String Tachyon as a Model for Cosmological Dark Energy Nonlocal String Tachyon as a Model for Cosmological Dark Energy

2004-10-19

arxiv.org/abs/astro-ph/0410443v2

Astronomy and Astrophysics

Astrophysics

12pages, 5 figures, talk given at QUARKS-2004, Pushkinskie Gory, Russia, May 2004; Typos corrected, refs. added

Scientific paper

There are many different phenomenological models describing the cosmological dark energy and accelerating Universe by choosing adjustable functions. In this paper we consider a specific model of scalar tachyon field which is derived from the NSR string field theory and study its cosmological applications. We find that in the effective field theory approximation the equation of state parameter w<-1, i.e. one has a phantom Universe. It is shown that due to nonlocal effects there is no quantum instability that the usual phantom models suffer from. Moreover due to a flip effect of the potential the Universe does not enter to a future singularity.

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