Tachyon cosmology with non-vanishing minimum potential

Details Tachyon cosmology with non-vanishing minimum potential Tachyon cosmology with non-vanishing minimum potential

2011-12-22

arxiv.org/abs/1112.5278v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pp

Scientific paper

We investigate the tachyon condensation process in the effective theory with non-vanishing minimum potential and its implications to cosmology. It is shown that the tachyon condensation on an unstable three-brane described by this modified tachyon field theory leads to lower-dimensonal branes (defects) forming within a stable three-brane. Thus, in the cosmological background, we can get oscillating tachyon matter after tachyon inflation, avoiding difficulties encountered in the original tachyon cosmological models. This feature also implies that the tachyon inflated and reheated universe is followed by a Chaplygin gas dark matter and dark energy universe. Hence, such an unstable three-brane behaves quite like our universe, reproducing the key features of the whole evolutional history of the universe in the right time order in a simple single-scalar field model.

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