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26 April 2024 |
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Tachyon Condensates, Carrollian Contraction of Lorentz Group, and Fundamental Strings | | Gary Gibbons
; Koji Hashimoto
; Piljin Yi
; | | Date: |
4 Sep 2002 | | Journal: | JHEP 0209 (2002) 061 | | Subject: | hep-th | | Abstract: | 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. | | Source: | arXiv, hep-th/0209034 | | Services: | Forum | Review | PDF | Favorites | |
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