Sharp boundaries for the swampland
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Publication:1981491
DOI10.1007/JHEP07(2021)110zbMATH Open1468.83031arXiv2102.08951OpenAlexW3131902135MaRDI QIDQ1981491
Author name not available (Why is that?)
Publication date: 3 September 2021
Published in: (Search for Journal in Brave)
Abstract: We reconsider the problem of bounding higher derivative couplings in consistent weakly coupled gravitational theories, starting from general assumptions about analyticity and Regge growth of the S-matrix. Higher derivative couplings are expected to be of order one in the units of the UV cutoff. Our approach justifies this expectation and allows to prove precise bounds on the order one coefficients. Our main tool are dispersive sum rules for the S-matrix. We overcome the difficulties presented by the graviton pole by measuring couplings at small impact parameter, rather than in the forward limit. We illustrate the method in theories containing a massless scalar coupled to gravity, and in theories with maximal supersymmetry.
Full work available at URL: https://arxiv.org/abs/2102.08951
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