Non-minimal coupling, exponential potentials and the w < -1 regime of dark energy - INSPIRE

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Non-minimal coupling, exponential potentials and the w < -1 regime of dark energy

Aug, 2004

4 pages

Published in:

Phys.Rev.D 70 (2004) 087302

e-Print:

astro-ph/0408013 [astro-ph]

DOI:

10.1103/PhysRevD.70.087302

View in:

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Abstract: (arXiv)

Recent observations and theoretical considerations have motivated the study of models for dark energy with equation of state characterized by a parameter

w=p/\rho<-1

. Such models, however, are usually believed to be inviable due to their instabilities against classical perturbations or potentially catastrophic vacuum decays. In this paper, we show that a simple quintessential model with potential

V(\phi)=Ae^{-\sigma\phi}

and a gravitational coupling of the form

(1+|\xi|\phi^2)R

can exhibit, for large sets of initial conditions, asymptotic de Sitter behavior with

w<-1

regimes. Nevertheless, the model is indeed stable at classical and quantum level.

98.80.Jk
98.80.Cq
98.80.Bp
dark energy
quintessence
phase space
stability

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