Can noncommutativity affect the whole history of the Universe?

Details Can noncommutativity affect the whole history of the Universe? Can noncommutativity affect the whole history of the Universe?

2011-09-16

arxiv.org/abs/1109.3514v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, 1 figure. Submitted to publication

Scientific paper

A noncommutative Friedmann-Robertson-Walker (NC-FRW) cosmological Universe is proposed. We prove that, at the classical level, the noncommutativity removes the future cosmological singularities originally present in the commutative version of the model. We show that noncommutativity affects the entire history of the Universe in an unsuspected way: for a closed FRW model with negative noncommutative (NC) parameter the evolution of the Universe has periodic acceleration with alternating sign; the NC parameter thus takes qualitative account of the early inflationary phase and a late regime of accelerated expansion, with an in-between period of decelerated expansion.

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