Browsing by Author "Tretjakov, P. V."

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    Fate of (phantom) dark energy universe with string curvature corrections
    (2005-01-01) Sami, M.; Tsujikawa, Shinji; Tretjakov, P. V.; et al.
    We study the evolution of (phantom) dark energy universe by taking into account the higher-order string corrections to Einstein-Hilbert action with fixed dilaton and modulus fields. While the presence of a cosmological constant gives stable de-Sitter fixed points in the cases of heterotic and bosonic strings, no stable de-Sitter solutions exist when a phantom fluid is present. We find that the universe can exhibit a Big Crunch singularity with a finite time for type II string, whereas it reaches a Big Rip singularity for heterotic and bosonic strings. Thus the fate of dark energy universe crucially depends upon the type of string theory under consideration.
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    Quantum effects, soft singularities and the fate of the universe in a braneworld cosmology
    (2006-03-24) Tretjakov, P. V.; Toporensky, A.; Shtanov, Yuri; et al.