THE RETURN OF THE PHOENIX UNIVERSE
2009; World Scientific; Volume: 18; Issue: 14 Linguagem: Inglês
10.1142/s0218271809015977
ISSN1793-6594
AutoresJean-Luc Lehners, Paul J. Steinhardt, Neil Turok,
Tópico(s)Black Holes and Theoretical Physics
ResumoGeorges 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.
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