Cosmological tachyon from cubic string field theory

Details Cosmological tachyon from cubic string field theory Cosmological tachyon from cubic string field theory

2005-12-20

arxiv.org/abs/hep-th/0512259v4

JHEP0605:012,2006

Physics

High Energy Physics

High Energy Physics - Theory

20 pages JHEP style, 1 figure; v4: misprints corrected, matches the published version

Scientific paper

10.1088/1126-6708/2006/05/012

The classical dynamics of the tachyon scalar field of cubic string field theory is considered on a cosmological background. Starting from a nonlocal action with arbitrary tachyon potential, which encodes the bosonic and several supersymmetric cases, we study the equations of motion in the Hamilton-Jacobi formalism and with a generalized Friedmann equation, appliable in braneworld or modified gravity models. The cases of cubic (bosonic) and quartic (supersymmetric) tachyon potential in general relativity are automatically included. We comment the validity of the slow-roll approximation, the stability of the cosmological perturbations, and the relation between this tachyon and the Dirac-Born-Infeld one.

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