Gauge Fields and Scalars in Rolling Tachyon Backgrounds

Details Gauge Fields and Scalars in Rolling Tachyon Backgrounds Gauge Fields and Scalars in Rolling Tachyon Backgrounds

2002-06-24

arxiv.org/abs/hep-th/0206212v2

JHEP 0302 (2003) 058

Physics

High Energy Physics

High Energy Physics - Theory

7 pages, uses Revtex4. Revised version, to appear in JHEP

Scientific paper

10.1088/1126-6708/2003/02/058

We investigate the dynamics of gauge and scalar fields on unstable D-branes with rolling tachyons. Assuming an FRW metric on the brane, we find a solution of the tachyon equation of motion which is valid for arbitrary tachyon potentials and scale factors. The equations of motion for a U(1) gauge field and a scalar field in this background are derived. These fields see an effective metric which differs from the original FRW metric. The field equations receive large corrections due to the curvature of the effective metric as well as the time variation of the gauge coupling. The equations of state for these fields resemble those of nonrelativistic matter rather than those of massless particles.

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