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

Libanov, M; Rubakov, V; Papantonopoulos, E; Sami, M; Tsujikawa, S

dc.contributor.author	Libanov, M	en
dc.contributor.author	Rubakov, V	en
dc.contributor.author	Papantonopoulos, E	en
dc.contributor.author	Sami, M	en
dc.contributor.author	Tsujikawa, S	en
dc.date.accessioned	2014-03-01T11:44:46Z
dc.date.available	2014-03-01T11:44:46Z
dc.date.issued	2007	en
dc.identifier.issn	1475-7516	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/37155
dc.subject	dark energy theory	en
dc.subject	gravity	en
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.classification	Physics, Particles & Fields	en
dc.subject.other	COSMOLOGICAL CONSTANT	en
dc.subject.other	ACCELERATING UNIVERSE	en
dc.subject.other	GRAVITY	en
dc.subject.other	SUPERNOVAE	en
dc.subject.other	QUINTESSENCE	en
dc.subject.other	POTENTIALS	en
dc.subject.other	DYNAMICS	en
dc.subject.other	QUANTUM	en
dc.subject.other	LAMBDA	en
dc.subject.other	BRANE	en
dc.title	Ultraviolet stable, Lorentz-violating dark energy with transient phantom era	en
heal.type	other	en
heal.identifier.primary	10.1088/1475-7516/2007/08/010	en
heal.identifier.secondary	http://dx.doi.org/10.1088/1475-7516/2007/08/010	en
heal.identifier.secondary	010	en
heal.language	English	en
heal.publicationDate	2007	en
heal.abstract	Phantom fields with negative kinetic energy are often plagued by vacuum quantum instability in the ultraviolet region. We present a Lorentzviolating dark energy model free from this problem and show that the crossing of the cosmological constant boundary omega = - 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 the homogeneity of the present/ future Universe.	en
heal.publisher	IOP PUBLISHING LTD	en
heal.journalName	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS	en
dc.identifier.doi	10.1088/1475-7516/2007/08/010	en
dc.identifier.isi	ISI:000249222000015	en
dc.identifier.issue	8	en