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research article

A new twist on spinning (A)dS correlators

Baumann, Daniel
•
Mathys, Grégoire  
•
Pimentel, Guilherme L.
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January 1, 2025
Journal of High Energy Physics

Massless spinning correlators in cosmology are extremely complicated. In contrast, the scattering amplitudes of massless particles with spin are very simple. We propose that the reason for the unreasonable complexity of these correlators lies in the use of inconvenient kinematic variables. For example, in de Sitter space, consistency with unitarity and the background isometries imply that the correlators must be conformally covariant and also conserved. However, the commonly used kinematic variables for correlators do not make all of these properties manifest. In this paper, we introduce twistor space as a powerful way to satisfy all kinematic constraints. We show that conformal correlators of conserved currents can be written as twistor integrals, where the conservation condition translates into holomorphicity of the integrand. The functional form of the twistor-space correlators is very simple and easily bootstrapped. For the case of two- and three-point functions, we verify explicitly that this reproduces known results in embedding space. We also perform a half-Fourier transform of the twistor-space correlators to obtain their counterparts in momentum space. We conclude that twistors provide a promising new avenue to study conformal correlation functions that exposes their hidden simplicity.

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Type
research article
DOI
10.1007/JHEP01(2025)202
Scopus ID

2-s2.0-85217506716

Author(s)
Baumann, Daniel

National Taiwan University

Mathys, Grégoire  

École Polytechnique Fédérale de Lausanne

Pimentel, Guilherme L.

Scuola Normale Superiore di Pisa

Rost, Facundo

National Taiwan University

Date Issued

2025-01-01

Publisher

Springer

Published in
Journal of High Energy Physics
Volume

2025

Issue

1

Article Number

202

Subjects

de Sitter space

•

Scale and Conformal Symmetries

•

Scattering Amplitudes

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
FSL  
Available on Infoscience
February 18, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/247029
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