The O(N) S-matrix monolith

DOI10.1007/JHEP04(2020)142zbMATH Open1436.81059arXiv1909.06495OpenAlexW3098504688MaRDI QIDQ780825

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Publication date: 15 July 2020

Published in: (Search for Journal in Brave)

Abstract: We consider the scattering matrices of massive quantum field theories with no bound states and a global $O(N)$ symmetry in two spacetime dimensions. In particular we explore the space of two-to-two S-matrices of particles of mass $m$ transforming in the vector representation as restricted by the general conditions of unitarity, crossing, analyticity and $O(N)$ symmetry. We found a rich structure in that space by using convex maximization and in particular its convex dual minimization problem. At the boundary of the allowed space special geometric points such as vertices were found to correspond to integrable models. The dual convex minimization problem provides a novel and useful approach to the problem allowing, for example, to prove that generically the S-matrices so obtained saturate unitarity and, in some cases, that they are at vertices of the allowed space.

Full work available at URL: https://arxiv.org/abs/1909.06495

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