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- W2002615107 abstract "We show that, in the presence of a string gas, simple higher-derivative modifications to the effective action for gravity can lead to bouncing and cyclic cosmological models. The modifications bound the expansion rate and avoid singularities at finite times. In these models the scale factors can have long loitering phases that solve the horizon problem. Adding a potential for the dilaton gives a simple realization of the pre-big bang scenario. Entropy production in the cyclic phase drives an eventual transition to a radiation-dominated Universe. As a test of the Brandenberger-Vafa scenario, we comment on the probability of decompactifying three spatial dimensions in this class of models." @default.
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- W2002615107 date "2009-09-21" @default.
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- W2002615107 title "Bouncing and cyclic string gas cosmologies" @default.
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- W2002615107 doi "https://doi.org/10.1103/physrevd.80.063526" @default.
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