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.
Related
- Tachyon-massless couplings at order α' in bosonic string theory
- Tachyon-massless couplings at order α′ in bosonic string theory
- Bosonic String Amplitudes From Ribbon Graphs
- Clock--WEP Tests of String-Derived Dilaton and Modulus Sectors
- The effective gravitational action of a massless chiral fermion and the absence of parity-odd contributions
BibTeX
@misc{garousi2026tachyon,
title = {{Tachyon and massless sectors of the bosonic string effective action}},
author = {Mohammad R. Garousi},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.38364},
eprint = {2610.38364},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.38364},
}
RIS
TY - UNPB
TI - Tachyon and massless sectors of the bosonic string effective action
AU - Mohammad R. Garousi
PY - 2026
DA - 2026/10/28
PB - arXiv
DO - 10.48550/arxiv.2610.38364
UR - https://arxiv.org/abs/2610.38364
AB - 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.
ER -