Gradient instability for w < -1

Simple item page
dc.creatorHsu, Stephen D. H.
dc.creatorJenkins, Alejandro
dc.creatorWise, Mark B.
dc.date2004-06-01
dc.date2004-07-07
dc.date.accessioned2026-07-07T10:47:52Z
dc.date.available2026-07-07T10:47:52Z
dc.descriptionWe show that in single scalar field models of the dark energy with equations of state satisfying $w \equiv p / ρ< -1$, the effective Lagrangian for fluctuations about the homogeneous background has a wrong sign spatial kinetic term. In most cases, spatial gradients are ruled out by microwave background observations. The sign of $w+1$ is not connected to the sign of the time derivative kinetic term in the effective Lagrangian.
dc.descriptionrevtex4, 8 pages, 1 figure. v2: corrected typo in Eq. 16, added references and a paragraph on quintessence models; v3: reordering of references. To appear in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/astro-ph/0406043
dc.identifierhttp://arxiv.org/abs/astro-ph/0406043
dc.identifierPhys.Lett.B597:270-274,2004
dc.identifierdoi:10.1016/j.physletb.2004.07.025
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/183681
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.titleGradient instability for w < -1
dc.typetext

Files

Collections

arXiv