From Big Bang to Asymptotic de Sitter: Complete Cosmologies in a Quantum Gravity Framework

Details From Big Bang to Asymptotic de Sitter: Complete Cosmologies in a Quantum Gravity Framework From Big Bang to Asymptotic de Sitter: Complete Cosmologies in a Quantum Gravity Framework

2005-07-18

arxiv.org/abs/hep-th/0507167v1

JCAP 0509 (2005) 012

Physics

High Energy Physics

High Energy Physics - Theory

47 pages, 17 figures

Scientific paper

10.1088/1475-7516/2005/09/012

Using the Einstein-Hilbert approximation of asymptotically safe quantum gravity we present a consistent renormalization group based framework for the inclusion of quantum gravitational effects into the cosmological field equations. Relating the renormalization group scale to cosmological time via a dynamical cutoff identification this framework applies to all stages of the cosmological evolution. The very early universe is found to contain a period of ``oscillatory inflation'' with an infinite sequence of time intervals during which the expansion alternates between acceleration and deceleration. For asymptotically late times we identify a mechanism which prevents the universe from leaving the domain of validity of the Einstein-Hilbert approximation and obtain a classical de Sitter era.

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