paper

Effective action of bosonic string theory at order

arXiv:1907.06500 · doi:10.1140/epjc/s10052-019-7357-4

Abstract

Recently, it has been shown that the gauge invariance requires the minimum number of independent couplings for -field, metric and dilaton at order to be 60. In this paper we fix the corresponding 60 parameters in string theory by requiring the couplings to be invariant under the global T-duality transformations. The Riemann cubed terms are exactly the same as the couplings that have been found by the S-matrix calculations.

18 pages, Latex file, no figure; V2: the version appears in EPJC; V3: a sign typo corrected

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