A lecture-note review of analytic tachyon vacuum solutions in open string field theory, including a one-parameter family of which the b = -1 member is non-physical.
Cosmological tachyon from cubic string field theory
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abstract
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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On Analytical Solutions in Witten's Cubic Open String Field Theory
A lecture-note review of analytic tachyon vacuum solutions in open string field theory, including a one-parameter family of which the b = -1 member is non-physical.