Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/94342
Type: Artigo de periódico
Title: Nonminimal Coupling, Exponential Potentials And The W < - 1 Regime Of Dark Energy
Author: Garvalho F.C.
Saa A.
Abstract: Recent observations and theoretical considerations have motivated the study of models for dark energy with equation of state characterized by a parameter w = p/ρ &lt; - 1. Such models, however, are usually believed to be inviable due to their instabilities against classical perturbations or potentially catastrophic vacuum decays. In this Brief Report, we show that a simple quintessential model with potential V(φ) = Ae-σφ and a gravitational coupling of the form (1 + |ξ|φ2)R can exhibit, for large sets of initial conditions, asymptotic de Sitter behavior with w &lt; - 1 regimes. Nevertheless, the model is indeed stable at classical and quantum level.
Editor: 
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.70.087302
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-19744381655&partnerID=40&md5=f8bbd787f77bef87f25a8d2f786a4530
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
2-s2.0-84927742223.pdf281.68 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.