Cosmological tachyon from cubic string field theory | Zendy

Gianluca Calcagni | Zendy

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Cosmological tachyon from cubic string field theory

Author(s) -

Gianluca Calcagni

Publication year - 2006

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2006/05/012

Subject(s) - tachyon , physics , tachyon condensation , mathematical physics , tachyonic field , string field theory , quartic function , non critical string theory , general relativity , string theory , string cosmology , theoretical physics , scalar field , classical mechanics , quantum mechanics , relationship between string theory and quantum field theory , quantum gravity , mathematics , quantum , gauge boson , gauge theory , pure mathematics , higgs mechanism

The classical dynamics of the tachyon scalar field of cubic string fieldtheory is considered on a cosmological background. Starting from a nonlocalaction with arbitrary tachyon potential, which encodes the bosonic and severalsupersymmetric cases, we study the equations of motion in the Hamilton-Jacobiformalism and with a generalized Friedmann equation, appliable in braneworld ormodified gravity models. The cases of cubic (bosonic) and quartic(supersymmetric) tachyon potential in general relativity are automaticallyincluded. We comment the validity of the slow-roll approximation, the stabilityof the cosmological perturbations, and the relation between this tachyon andthe Dirac-Born-Infeld one.Comment: 20 pages JHEP style, 1 figure; v4: misprints corrected, matches the published versio

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