A tachyon lump in closed string field theory

Abstract

We find a codimension one lump solution of closed bosonic string field theory. We consider vertices up to quartic order and include in the string field the tachyon, the ghost dilaton, and a metric fluctuation. While the tachyon profile clearly is that of a lump, we observe that the ghost dilaton is roughly constant in the direction transverse to the lump, equal to the value it takes in the nonperturbative tachyon vacuum. We explain, with a simple model, why this should be expected.

13 pages, 4 figures; typos corrected; clarifications added

References in corpus (4)

• Closed Bosonic String Field Theory at Quintic Order: Five-Tachyon Contact Term and Dilaton Theorem
• Closed Bosonic String Field Theory at Quintic Order II: Marginal Deformations and Effective Potential
• Field Redefinitions, T-duality and Solutions in Closed String Field Theories
• Light-like tachyon condensation in Open String Field Theory

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