Current observational constraints on cosmic doomsday
Abstract
In a broad class of dark energy models, the universe may collapse within a finite time t_{c}. Here we study a representative model of dark energy with a linear potential, V (phgr) = V_{0}(1+αphgr). This model is the simplest doomsday model, in which the universe collapses rather quickly after it stops expanding. Observational data from type Ia supernovae (SNe Ia), cosmic microwave background anisotropy (CMB), and large scale structure (LSS) are complementary in constraining dark energy models. Using the new SN Ia data (the Riess sample), the CMB data from WMAP, and the LSS data from 2dF, we find that the collapse time of the universe is t_{\mathrm {c}} \gtrsim 42 (24) Gyr from today at 68% (95%) confidence.
 Publication:

Journal of Cosmology and AstroParticle Physics
 Pub Date:
 December 2004
 DOI:
 10.1088/14757516/2004/12/006
 arXiv:
 arXiv:astroph/0409264
 Bibcode:
 2004JCAP...12..006W
 Keywords:

 Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 19 pages, 6 figures, comments added