Beyond Inflation:. A Cyclic Universe Scenario

Details Beyond Inflation:. A Cyclic Universe Scenario Beyond Inflation:. A Cyclic Universe Scenario

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005stc..conf...76t&link_type=abstract

STRING THEORY AND COSMOLOGY. Proceedings of Nobel Symposium 127. Held 14-19 August 2003 in Sigtuna, Sweden. Edited by U Danielss

Mathematics

Logic

Gravity In More Than Four Dimensions, Kaluza-Klein Theory, Unified Field Theories, Alternative Theories Of Gravity, Cosmology, Strings And Branes, Particle-Theory And Field-Theory Models Of The Early Universe

Scientific paper

Inflation has been the leading early universe scenario for two decades, and has become an accepted element of the successful 'cosmic concordance' model. However, there are many puzzling features of the resulting theory. It requires both high energy and low energy inflation, with energy densities differing by a hundred orders of magnitude. The questions of why the universe started out undergoing high energy inflation, and why it will end up in low energy inflation, are unanswered. Rather than resort to anthropic arguments, we have developed an alternative cosmology, the cyclic universe [1], in which the universe exists in a very long-lived attractor state determined by the laws of physics. The model shares inflation's phenomenological successes without requiring an epoch of high energy inflation. Instead, the universe is made homogeneous and flat, and scale-invariant adiabatic perturbations are generated during an epoch of low energy acceleration like that seen today, but preceding the last big bang. Unlike inflation, the model requires low energy acceleration in order for a periodic attractor state to exist. The key challenge facing the scenario is that of passing through the cosmic singularity at t = 0. Substantial progress has been made at the level of linearised gravity, which is reviewed here. The challenge of extending this to nonlinear gravity and string theory remains.

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