The Ups and Downs of Cyclic Universes
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Volume
75
Pagination
043515 - ?
Publisher URL
DOI
10.1103/PhysRevD.75.043515
Journal
Phys.Rev.D
Metadata
Show full item recordAbstract
We investigate homogeneous and isotropic oscillating cosmologies with multiple fluid components. Transfer of energy between these fluids is included in order to model the effects of non-equilibrium behavior on closed universes. We find exact solutions which display a range of new behaviors for the expansion scale factor. Detailed examples are studied for the exchange of energy from dust or scalar field into radiation. We show that, contrary to expectation, it is unlikely that such models can offer a physically viable solution to the flatness problem.