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Uniqueness Criteria for the Virasoro-Shapiro Amplitude

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arxiv 2408.03362 v2 pith:X4D6E6FY submitted 2024-08-06 hep-th gr-qchep-ph

classification hep-thgr-qchep-ph
keywords amplitudesstringcloseddeformationsexhibitfallofflevelscattering
verification ladder T0 review T1 audit T2 compute T3 formal
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The scattering amplitudes of string theory exhibit many extraordinary properties. But are they the unique mathematical objects to do so? Recently, it has been shown how the spectrum and amplitudes of open string theory follow directly from the assumptions of faster than power-law falloff at high energies and a property dubbed level truncation. At present there is no analogous principle for closed string scattering, which is famously rigid and naively impervious to modification. In this paper we analytically bootstrap the spectrum and four-point amplitudes of the closed string -- together with a parameterized space of deformations -- from conditions on high-energy falloff and level truncation. While these deformations exhibit the same Regge scaling as pure gravity, in the tensionless limit they reproduce remarkable extremal amplitudes that have appeared in bottom-up studies of positivity.

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Cited by 9 Pith papers

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