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Phantom behavior via cosmological creation of particles

By Rafael C. Nunes and Diego Pavón

Abstract

Recent determinations of the equation of state of dark energy hint that this may well be of the phantom type, i.e., $w_{de} < -1$. If confirmed by future experiments, this would strongly point to the existence of fields that violate the dominant energy condition, which are known to present serious theoretical difficulties. This paper presents an alternative to this possibility, namely, that the measured equation of state, $w_{de}$, is in reality an effective one, the equation of state of the quantum vacuum, $w_{\Lambda} = -1$, plus the negative equation of state, $w_{c}$, associated to the production of particles by the gravitational field acting on the vacuum. To illustrate this, three phenomenological models are proposed and constrained with recent observational data.Comment: 20 pages, 6 eps figures, to be published in the Physical Review

Topics: General Relativity and Quantum Cosmology
Publisher: 'American Physical Society (APS)'
Year: 2015
DOI identifier: 10.1103/PhysRevD.91.063526
OAI identifier: oai:arXiv.org:1503.04113

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