DE1 - Dark Energy and the Accelerating Universe |
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Speaker |
Kamenshchik, Alexander |
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| Talk Title |
Singularity crossing, transformation of matter properties and the problem of parametrization in field theories |
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Abstract |
We investigate particular cosmological models, based either on tachyon fields or on perfect fluids, for which soft future singularities arise in a natural way. Our main result is the description of a smooth crossing of the soft singularity in models with an anti-Chaplygin gas or with a particular tachyon field in the presence of dust. Such a crossing is made possible by certain transformations of matter properties. We discuss and compare also different approaches to the problem of crossing of the Big Bang - Big Crunch singularities. |
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