String propagation in a tachyon background

Das, Sumit R. ; Sathiapalan, B. (1986) String propagation in a tachyon background Physical Review Letters, 56 (25). pp. 2664-2667. ISSN 0031-9007

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The equation of motion of the tachyon field is obtained by requiring conformal invariance of the closed bosonic string propagator in a tachyon background. The cubic tachyon coupling is also obtained in this way. These equations are generalizations of the Kosterlitz-Thouless flow equations and involve nonperturbative contributions to the β functions.

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