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

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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
dc.identifier.doi 10.1088/1475-7516/2007/08/010 en
dc.identifier.isi ISI:000249222000015 en
dc.identifier.issue 8 en

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