Bounce solutions in viscous fluid cosmology |
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Authors: | Ratbay Myrzakulov Lorenzo Sebastiani |
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Institution: | 1. Eurasian International Center for Theoretical Physics and Department of General Theoretical Physics, Eurasian National University, Astana, 010008, Kazakhstan
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Abstract: | We investigate the bounce cosmology induced by inhomogeneous viscous fluids in FRW space-time (non necessarily flat), taking into account the early-time acceleration after the bounce. Different forms for the scale factor and several examples of fluids will be considered. We also analyze the relation between bounce and finite-time singularities and between the corresponding fluids realizing this scenarios. In the last part of the work, the study is extended to the framework of f(R)-modified gravity, where the modification of gravity may also be considered as an effective (viscous) fluid producing the bounce. |
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