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Type: Artigo de periódico
Title: Quantum effects and superquintessence in the new age of precision cosmology
Author: Gunzig, E
Saa, A
Abstract: Recent observations of Type la supernova at high redshifts establish that the dark energy component of the universe has (a probably constant) ratio between pressure and energy density w = p/p = -1.02((+0.13)(-0.19)). The conventional quintessence models for dark energy are restricted to the range -1 < w < 0, with the cosmological constant corresponding to w = -1. Conformally coupled quintessence models are the simplest ones compatible with the marginally allowed superaccelerated regime (w < -1). However, they are known to be plagued with anisotropic singularities. We argue here that the extension of the classical approach to the semiclassical one, with the inclusion of quantum counterterms necessary to ensure the renormalization, can eliminate the anisotropic singularities preserving the isotropic behavior of conformally coupled superquintessence models. Hence, besides of having other interesting properties, they axe consistent candidates to describe the superaccelerated phases of the universe compatible with the present experimental data.
Subject: cosmology
dark energy
quantum gravity
Country: Singapura
Editor: World Scientific Publ Co Pte Ltd
Rights: fechado
Identifier DOI: 10.1142/S0218271804006292
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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