A Closed String Tachyon Vacuum ?

Details A Closed String Tachyon Vacuum ? A Closed String Tachyon Vacuum ?

2005-06-09

arxiv.org/abs/hep-th/0506077v4

JHEP 0509:054,2005

Physics

High Energy Physics

High Energy Physics - Theory

32 pages, 4 figures, LaTeX. Replaced version: three new references added. V3: two same interactions in eqn. (2.26) were combin

Scientific paper

10.1088/1126-6708/2005/09/054

In bosonic closed string field theory the "tachyon potential" is a potential for the tachyon, the dilaton, and an infinite set of massive fields. Earlier computations of the potential did not include the dilaton and the critical point formed by the quadratic and cubic interactions was destroyed by the quartic tachyon term. We include the dilaton contributions to the potential and find that a critical point survives and appears to become more shallow. We are led to consider the existence of a closed string tachyon vacuum, a critical point with zero action that represents a state where space-time ceases to be dynamical. Some evidence for this interpretation is found from the study of the coupled metric-dilaton-tachyon effective field equations, which exhibit rolling solutions in which the dilaton runs to strong coupling and the Einstein metric undergoes collapse.

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