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Celestial insights into the S-matrix bootstrap

Ghosh, S and Raman, P and Sinha, A (2022) Celestial insights into the S-matrix bootstrap. In: Journal of High Energy Physics, 2022 (8).

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Official URL: https://doi.org/10.1007/JHEP08(2022)216


We consider 2-2 scattering in four spacetime dimensions in Celestial variables. Using the crossing symmetric dispersion relation (CSDR), we recast the Celestial amplitudes in terms of crossing symmetric partial waves. These partial waves have spurious singularities in the complex Celestial variable, which need to be removed in local theories. The locality constraints (null constraints) admit closed form expressions, which lead to novel bounds on partial wave moments. These bounds allow us to quantify the degree of low spin dominance(LSD) for scalar theories. We study a new kind of positivity that seems to be present in a wide class of theories. We prove that this positivity arises only in theories with a spin-0 dominance. The crossing symmetric partial waves with spurious singularities removed, dubbed as Feynman blocks, have remarkable properties in the Celestial variable, namely typically realness, in the sense of Geometric Function Theory (GFT). Using GFT techniques we derive non-projective bounds on Wilson coefficients in terms of partial wave moments.

Item Type: Journal Article
Publication: Journal of High Energy Physics
Publisher: Springer Science and Business Media Deutschland GmbH
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Effective Field Theories; Scale and Conformal Symmetries; Scattering Amplitudes
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 05 Oct 2022 05:48
Last Modified: 05 Oct 2022 05:48
URI: https://eprints.iisc.ac.in/id/eprint/77030

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