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Journal Article

Double-soft behavior of massless closed strings interacting with any number of closed string tachyons


Mojaza,  Matin
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Marotta, R., & Mojaza, M. (2020). Double-soft behavior of massless closed strings interacting with any number of closed string tachyons. Journal of High Energy Physics, 2020(8): 83. doi:10.1007/JHEP08(2020)083.

Cite as: https://hdl.handle.net/21.11116/0000-0006-84C7-4
We calculate the simultaneous double-soft limit of two massless closed
strings scattering with any number of closed string tachyons to the subleading
order at the tree level. The limit factorizes the scattering amplitude into a
double-soft factor multiplying the pure tachyon subamplitude, suggesting a
universal double-soft theorem for the massless closed string. We confirm an
existing result for the double-soft graviton in an on-shell equivalent, but
different form, while also establishing the double-soft factorization behavior
of the string dilaton and of the Kalb-Ramond state, as well as the mixed
graviton-dilaton case. We also show that the simultaneous and consecutive
double-soft theorems are consistent with each other. We furthermore provide a
complete field theory diagrammatic view on our result, which enables us in
particular to establish a four-point interaction vertex for two tachyons and
two massless closed string states, as well as the missing in field theory of
three-point interaction of two massless closed string state and one tachyon.