Ju n 20 02 UPR-992-T Cosmological Constraints on Tachyon Matter


We examine whether tachyon matter is a viable candidate for the cosmological dark matter. First, we demonstrate that in order for the density of tachyon matter to have an acceptable value today, the magnitude of the tachyon potential energy at the onset of rolling must be finely tuned. For a tachyon potential V (T ) ∼ M4 P l exp(−T/τ), the tachyon must… (More)


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