Coincidence problem in an oscillating universe |
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Authors: | Guangcan?Yang Email author" target="_blank">Anzhong?WangEmail author |
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Institution: | (1) School of Physics and Electronic Information, Wenzhou University, Wenzhou, 325000, China;(2) CASPER, Department of Physics, Baylor University, Waco, TX 76798-7316, USA |
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Abstract: | We analyze an oscillating universe model in brane world cenario. The oscillating universe cycles through a series of expansions
and contractions and its energy density is dominated by dust matter at early-time expansion phase and by phantom dark energy
at late-time expansion phase. We find that the period of the oscillating universe is not sensitive to the tension of the brane,
but sensitive to the equation-of-state parameter w of the phantom dark energy, and the ratio of the period to the current Hubble age approximately varies from 3 to 9 when the
parameter w changes from −1.4 to −1.1. The fraction of time that the oscillating universe spends in the coincidence state is also comparable
to the period of the oscillating universe. This result indicates that the coincidence problem can be significantly ameliorated
in the oscillating universe without singularity. |
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Keywords: | Brane world Phantom field |
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