Bound to bounce: a coupled scalar-tachyon model for a smooth cyclic universe

Details Bound to bounce: a coupled scalar-tachyon model for a smooth cyclic universe Bound to bounce: a coupled scalar-tachyon model for a smooth cyclic universe

2010-12-31

arxiv.org/abs/1101.0202v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

32 pages latex; 5 figures

Scientific paper

We introduce a string-inspired model for a cyclic universe, utilizing the tachyon-scalar coupling as well as contribution from curvature in a closed universe. The universe undergoes a locked inflation stage after each bounce. Cycles of inflation, decelerating expansion, followed by contraction are made possible because of the negative contribution to effective energy density by the curvature term. No ghosts are ever generated at any point in the entire evolution of the universe. The minimum size of the universe is nonzero for generic initial values of the scalar field. The Null, Weak, and Dominant Energy Conditions are not violated at the bounce points, contrary to many bounce models previously proposed. And the Strong Energy Condition is satisfied in periods with tachyon matter domination.

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