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What is needed of a tachyon if it is to be the dark energy?

By Edmund Copeland and others
We study a dark energy scenario in the presence of a tachyon field \phi with potential V(\phi) and a barotropic perfect fluid. The cosmological dynamics crucially depends on the asymptotic behavior of the quantity \lambda=-M_pV_\phi/V^{3/2}. If \lambda is a constant, which corresponds to an inverse square potential V(\phi) \propto \phi^{-2},... Show more
January 28, 2005
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What is needed of a tachyon if it is to be the dark energy?
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