Gauge fields and scalars in rolling tachyon backgrounds | Zendy

Thomas Mehen | Zendy; Brian Wecht | Zendy

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Gauge fields and scalars in rolling tachyon backgrounds

Author(s) -

Thomas Mehen,

Brian Wecht

Publication year - 2003

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 - 10.1088/1126-6708/2003/02/058

Subject(s) - tachyon , friedmann–lemaître–robertson–walker metric , physics , mathematical physics , scalar field , introduction to gauge theory , curvature , gauge theory , equations of motion , mathematical descriptions of the electromagnetic field , classical mechanics , scalar (mathematics) , quantum electrodynamics , cosmology , gauge anomaly , quantum mechanics , geometry , mathematics

We investigate the dynamics of gauge and scalar fields on unstable D-braneswith rolling tachyons. Assuming an FRW metric on the brane, we find a solutionof the tachyon equation of motion which is valid for arbitrary tachyonpotentials and scale factors. The equations of motion for a U(1) gauge fieldand a scalar field in this background are derived. These fields see aneffective metric which differs from the original FRW metric. The fieldequations receive large corrections due to the curvature of the effectivemetric as well as the time variation of the gauge coupling. The equations ofstate for these fields resemble those of nonrelativistic matter rather thanthose of massless particles.Comment: 7 pages, uses Revtex4. Revised version, to appear in JHE

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