The fate of (phantom) dark energy universe with string curvature corrections
M. SamiIUCAA, Post Bag 4, Ganeshkhind, Pune 411 007, IndiaA. V. ToporenskySternberg Astronomical Institute, Moscow State University, Universitetsky Prospekt, 13, Moscow 119899, RussiaPeter V. TretjakovSternberg Astronomical Institute, Moscow State University, Universitetsky Prospekt, 13, Moscow 119899, RussiaShinji TsujikawaDepartment of Physics, Gunma National College of Technology, Gunma 371-8530, Japan
2005en
ABI
Abstract
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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