Observational constraints upon quintessence models arising from moduli fields

Details Observational constraints upon quintessence models arising from moduli fields Observational constraints upon quintessence models arising from moduli fields

2000-04-14

arxiv.org/abs/astro-ph/0004196v2

Phys.Lett. B485 (2000) 1-8

Astronomy and Astrophysics

Astrophysics

6 pages, RevTeX, 9 figures, corrected some typos, accepted for publication in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(00)00691-2

We study observational constraints on cosmological models with a quintessence arising from moduli fields. The scalar field potential is given by a double exponential potential V=V_0 exp(-A e^{sqrt{2} kappa phi}). After reviewing the properties of the solutions, from a dynamical systems phase space analysis, we consider the constraints on parameter values imposed by luminosity distances from the 60 Type IA supernovae published by Perlmutter et al., and also from gravitational lensing statistics of distant quasars. We also update the constraints on models with a single exponential potential V=V_0 e^{-lambda kappa phi}.

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