Accelerating universe in two-dimensional noncommutative dilaton cosmology

Details Accelerating universe in two-dimensional noncommutative dilaton cosmology Accelerating universe in two-dimensional noncommutative dilaton cosmology

2006-08-07

arxiv.org/abs/gr-qc/0608032v3

Phys.Lett.B645:82-87,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages, 2 figures; to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2006.11.075

We show that the phase transition from the decelerating universe to the accelerating universe, which is of relevance to the cosmological coincidence problem, is possible in the semiclassically quantized two-dimensional dilaton gravity by taking into account the noncommutative field variables during the finite time. Initially, the quantum-mechanically induced energy from the noncommutativity among the fields makes the early universe decelerate and subsequently the universe is accelerating because the dilaton driven cosmology becomes dominant later.

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