arXiv:astro-ph/0409264astro-ph
Current Observational Constraints on Cosmic Doomsday
Early discovery. Linked by one identifiable commenter. This paper is outside the main ranking; a mention is not an endorsement.
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(φ)=V_0(1+αφ). 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 (Riess sample), the CMB data from WMAP, and the LSS data from 2dF, we find that the collapse time of the universe is t_c > 42 (24) gigayears from today at 68% (95%) confidence.
Thank you for the kind words. Nobody's wanted to talk seriously about "terminal" Big Crunch for many years -- the 1998 type Ia SN light curve redshift work that earned the 2011 Nobel prize in physics pretty much killed off the idea of an inertially-expanding universe, rather…
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