Cosmic Equation of State, Quintessence and Decaying Dark Matter

Details Cosmic Equation of State, Quintessence and Decaying Dark Matter Cosmic Equation of State, Quintessence and Decaying Dark Matter

2000-02-21

arxiv.org/abs/astro-ph/0002400v2

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures. An appendix is added to define equivalent quintessence models

Scientific paper

If CDM particles decay and their lifetime is comparable to the age of the Universe, they can modify its equation of state. By comparing the results of numerical simulations with high redshift SN-Ia observations we show that this hypothesis is consistent with present data. Fitting the simplest quintessence models with constant $w_q$ to data leads to $w_q \lesssim -1$. We show that a universe with a cosmological constant or quintessence matter with $w_q \sim -1$ and a decaying Dark Matter has an effective $w_q < -1$ and fits SN data better than stable CDM or quintessence models with $w_q > -1$.

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