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We investigate the tachyon condensation process in the effective theory withnon-vanishing minimum potential and its implications to cosmology. It is shownthat the tachyon condensation on an unstable three-brane described by thismodified tachyon field theory leads to lower-dimensional branes (defects)forming within a stable three-brane. Thus, in the cosmological background, wecan get well-behaved tachyon matter after tachyon inflation, (partially)avoiding difficulties encountered in the original tachyon cosmological models.This feature also implies that the tachyon inflated and reheated universe isfollowed by a Chaplygin gas dark matter and dark energy universe. Hence, suchan unstable three-brane behaves quite like our universe, reproducing the keyfeatures of the whole evolutionary history of the universe and providing aunified description of inflaton, dark matter and dark energy in a very simplesingle-scalar field model.

Tachyon cosmology with non-vanishing minimum potential: a unified model