Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-04-14
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.
Libanov Maxim
Papantonopoulos Eleftherios
Rubakov Valery
Sami M.
Tsujikawa Shinji
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