Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-10-05
Int.J.Mod.Phys.D18:2231-2235,2009
Physics
High Energy Physics
High Energy Physics - Theory
5 pages, Honorable Mention at the 2009 Gravity Research Foundation essay competition
Scientific paper
10.1142/S0218271809015977
Georges Lemaitre introduced the term "phoenix universe" to describe an oscillatory cosmology with alternating periods of gravitational collapse and expansion. This model is ruled out observationally because it requires a supercritical mass density and cannot accommodate dark energy. However, a new cyclic theory of the universe has been proposed that evades these problems. In a recent elaboration of this picture, almost the entire universe observed today is fated to become entrapped inside black holes, but a tiny region will emerge from these ashes like a phoenix to form an even larger smooth, flat universe filled with galaxies, stars, planets, and, presumably, life. Survival depends crucially on dark energy and suggests a reason why its density is small and positive today.
Lehners Jean-Luc
Steinhardt Paul J.
Turok Neil
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