Closed String Tachyons and Their Implications for Non-Supersymmetric Strings

Details Closed String Tachyons and Their Implications for Non-Supersymmetric Strings Closed String Tachyons and Their Implications for Non-Supersymmetric Strings

2003-03-09

arxiv.org/abs/hep-th/0303076v2

JHEP 0407 (2004) 034

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, no figures, references added

Scientific paper

10.1088/1126-6708/2004/07/034

Closed string tachyons have long been somewhat mysterious. We note that there is often a regime in the classical moduli space in which one can systematically compute the effective action for such fields. In this regime, the tachyon is light, and cannot be integrated out. Instead, one must consider the combined dynamics of gravitons, moduli, tachyons and other light fields. We compute the action and find that the quartic term for the tachyon is positive in the field definition where the tachyon has no derivative coupling to the radion. We study the evolution of isotropic, homogeneous configurations and find that typically the system is driven to regions where the calculation is no longer under control.

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