2003/01/31 by Houri Ziaeepour, H. Ziaeepour, Ziaeepour, Houri
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #Geophysics and Gravity Measurements #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0301640
Poster presented in "TH-2002" Conference, Unesco, Paris, July 22-27, 2002
arxiv created 2003/01/31 · openalex publication_date 2003/01/31 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
It is a known fact that a quintessence model with wq < -1 fits the publicly available Super Nova (SN) type Ia data better than a model with cosmological constant or wq > -1. Two types of models have this property: Scalar fields with unconventional kinetic term and models with cosmological constant and a slowly decaying Cold Dark Matter (CDM). In this work we investigate the possibility of replacing the cosmological constant in the latter models with gradual condensation of a scalar field produced during the decay of the CDM and present some preliminary results. The advantage of this class of models to the ordinary quintessence is that the evolution of the dark energy and CDM are correlated and cosmological coincidence problem is solved or at least reduced to the fine tuning of the coupling between decaying CDM and quintessence field i.e the Hierarchy problem. Here we show that for part of the parameter space these models are consistent with present estimation of cosmological parameters.