Tachyon and massless sectors of the bosonic string effective action

Abstract

Recently, it has been observed that in certain schemes of the bosonic string effective action, the non-derivative tachyon appears only in the tachyon potential, while all other couplings involve covariant derivatives of the tachyon and massless fields. Within these schemes, a minimal basis can be found whose coupling constants are constrained by T-duality upon circle reduction. Using this constraint, one obtains sets of couplings at each order of \(α'\) that are invariant under Buscher rules supplemented by higher-derivative corrections for all base-space fields except the tachyon. In this paper, we observe that consistency of these T-dual sets with S-matrix elements requires an appropriate field redefinition, such that each set becomes invariant under Buscher rules supplemented by higher-derivative corrections for all base-space fields except the metric, dilaton, and tachyon. This separates the couplings into a massless sector and a tachyon sector. We determine the six-derivative couplings in the massless sector, with all coupling constants fixed, and find two T-dual couplings in the tachyon sector with arbitrary coupling constants. We show that the leading-order action and the massless-sector couplings exactly reproduce the expansion of the sphere-level S-matrix element of two tachyons and two massless vertex operators at six-momentum order, and that the coupling constant of the four-tachyon coupling in the tachyon sector is fixed by the expansion of the four-tachyon S-matrix element at six-momentum order.