5 papers
Recursion Relations, Double Copy and Ward Identities
Grégoire Mathys, Guilherme L. Pimentel, Facundo Rost
We consider correlation functions of massless fields in three-dimensional Anti-de Sitter spacetime. Using embedding-space spinors akin to spinor helicity variables, we show that ma…
Positive Geometry of Yang-Mills Correlators
Mattia Arundine, Veronica Calvo Cortes, Joris Koefler +1
We develop a positive-geometric formulation of tree-level Yang-Mills correlators in de Sitter space at three and four points through their helicity-stripped representatives on the…
The Cosmological Grassmannian
Mattia Arundine, Daniel Baumann, Mang Hei Gordon Lee +2
We introduce the orthogonal Grassmannian as a novel kinematic space for describing correlators of massless spinning fields in de Sitter space. By automatically encoding the constra…
Quasinormal Modes and the Switchback Effect in Schwarzschild-de Sitter
Mir Mehedi Faruk, Facundo Rost, Jan Pieter van der Schaar
We study the causal structure of Schwarzschild-de Sitter (SdS), including shock wave perturbations, in using reflected null ray trajectories, either through the interior blac…
A New Twist on Spinning (A)dS Correlators
Daniel Baumann, Grégoire Mathys, Guilherme L. Pimentel +1
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 re…