This article is cited in 4 papers

Tachyon Effective Actions in String Theory

A. A. Tseytlin<sup>abc

a</sup> P. N. Lebedev Physical Institute, Russian Academy of Sciences
^b Ohio State University
^c Imperial College, Theoretical Physics Blackett Laboratory

Abstract: We discuss the derivation of string effective actions for tachyons and massless modes within the sigma-model approach. We mostly consider the open string case, demonstrating that the renormalized partition function of the boundary sigma model gives the effective action for the massless vector and tachyon in the derivative expansion. We give a manifestly gauge-invariant definition of $Z(T,A)$ in the non-Abelian Neveu–Schwarz–Ramond (NSR) open string theory and verify that its derivative reproduces the tachyon beta function in a particular scheme. We also comment on the derivation of similar actions for tachyons and massless modes in the closed bosonic and the NSR string theories.

Received: 20.04.2001

DOI: 10.4213/tmf513

 English version: Theoretical and Mathematical Physics, 2001, 128:3, 1293–1310

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