A stringy massive double copy

Dieter Lüst

doi:10.1007/JHEP08(2023)193

A stringy massive double copy

2023-08-28

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DOI：10.1007/JHEP08(2023)193

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We derive a massive double copy construction within string theory. To this end, we use massive vectors of the open string spectrum that appear in compactifications to four dimensions and construct massive spin-2 tensors as closed string states, thereby mimicking the structure of the massless graviton. We then compute three-point amplitudes for the scattering of massless and massive spin-2 closed string states and reveal the double copy structure of the latter. With these results being finite in the string scale, we are further able to reproduce the cubic Lagrangian of ghost-free bimetric theory around flat spacetime for bulk massive spin-2 states originating in products of vectors of extended brane supersymmetry.

Keywords:

Classical Theories of Gravity

Extended Supersymmetry

Scattering Amplitudes

Superstrings and Heterotic Strings

A stringy massive double copy

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