Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cpa..conf..114l&link_type=abstract
PROCEEDINGS OF THE 2002 INTERNATIONAL SYMPOSIUM ON COSMOLOGY AND PARTICLE ASTROPHYSICS (CosPA 02). Held 31 May ?2 June 2002 in T
Astronomy and Astrophysics
Astrophysics
Scientific paper
The equation of state of the hypothetical dark energy component, which constitutes about two thirds of the critical density of the universe, may be very different from that of a cosmological constant. Employing a phenomenological model, we investigate the constraints imposed on the scalar quintessence by supernovae observations, and by the acoustic scale extracted from recent CMB data. We show that a universe with a quintessence-dominated phase in the dark age is consistent with the current observational constraints. This may have effects on the evolution of density perturbations and the subsequent structure formation. Furthermore, we explore the possibility of coupling the quintessence to electromagnetism, and discuss its implication to the generation of primordial magnetic fields.
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