Accelerating universe in two-dimensional noncommutative dilaton cosmology |
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Authors: | Wontae Kim Myung Seok Yoon |
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Affiliation: | 1. Department of Physics, Center for Quantum Spacetime, and Basic Science Research Institute, Sogang University, PO Box 1142, Seoul 100-611, South Korea;2. Department of Physics, Sejong University, Seoul 143-747, South Korea |
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Abstract: | 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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Keywords: | 02.40.Gh 04.60.-m 98.80.Qc |
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