UV stable, Lorentz-violating dark energy with transient phantom era

Details UV stable, Lorentz-violating dark energy with transient phantom era UV stable, Lorentz-violating dark energy with transient phantom era

2007-04-14

arxiv.org/abs/0704.1848v2

JCAP0708:010,2007

Physics

High Energy Physics

High Energy Physics - Theory

22 pages, 7 figures; Presentation modified substantially, results and conclusions unchanged. Journal version

Scientific paper

10.1088/1475-7516/2007/08/010

Phantom fields with negative kinetic energy are often plagued by the vacuum quantum instability in the ultraviolet region. We present a Lorentz-violating dark energy model free from this problem and show that the crossing of the cosmological constant boundary w=-1 to the phantom equation of state is realized before reaching a de Sitter attractor. Another interesting feature is a peculiar time-dependence of the effective Newton's constant; the magnitude of this effect is naturally small but may be close to experimental limits. We also derive momentum scales of instabilities at which tachyons or ghosts appear in the infrared region around the present Hubble scale and clarify the conditions under which tachyonic instabilities do not spoil homogeneity of the present/future Universe.

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