Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-09-04
JHEP 0209:061,2002
Physics
High Energy Physics
High Energy Physics - Theory
28 pages, typos corrected
Scientific paper
10.1088/1126-6708/2002/09/061
We study the rolling tachyon condensate in the presence of a gauge field. The generic vacuum admits both a rolling tachyon, \dot{T}, and a uniform electric field, \vec{E}, which together affect the effective metric governing the fluctuations of open string modes. If one suppresses the gauge field altogether, the light-cone collapses completely. This is the Carrollian limit, with vanishing speed of light and no possible propagation of signals. In the presence of a gauge field, however, the lightcone is squeezed to the shape of a fan, allowing propagation of signals along the direction of \pm \vec{E} at speed |E|=<1. This shows that there are perturbative degrees of freedom propagating along electric flux lines. Such causal behavior appears to be a very general feature of tachyon effective Lagrangian with runway potentials. We speculate on how this may be connected to appearance of fundamental strings.
Gibbons Gary
Hashimoto Katsumi
Yi Piljin
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