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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.
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.70.087302
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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