Compère, Geoffrey Oliveri, Roberto Seraj, Ali
Published in
Journal of High Energy Physics

Asymptotically flat spacetimes admit both supertranslations and Lorentz transformations as asymptotic symmetries. Furthermore, they admit super-Lorentz transformations, namely superrotations and superboosts, as outer symmetries associated with super-angular momentum and super-center-of-mass charges. In this paper, we present comprehensively the flu...

Harksen, Matthias Hidalgo, Diego Sybesma, Watse Thorlacius, Lárus

Starting from the Polyakov action we consider two distinct Carroll limits in target space, keeping the string worldsheet relativistic. The resulting magnetic and chiral Carroll string models exhibit different symmetries and dynamics. Both models have an infinite dimensional symmetry algebra with Carroll symmetry included in a finite dimensional sub...

Albrychiewicz, Emil Neiman, Yasha Tsulaia, Mirian
Published in
Journal of High Energy Physics

We study the scattering problem in the static patch of de Sitter space, i.e. the problem of field evolution between the past and future horizons of a de Sitter observer. We formulate the problem in terms of off-shell fields in Poincare coordinates. This is especially convenient for conformal theories, where the static patch can be viewed as a flat ...

Armstrong-Williams, Kymani Nagy, Silvia White, Chris D. Wikeley, Sam

The phenomenon of BCJ duality implies that gauge theories possess an abstract kinematic algebra, mirroring the non-abelian Lie algebra underlying the colour information. Although the nature of the kinematic algebra is known in certain cases, a full understanding is missing for arbitrary non-abelian gauge theories, such that one typically works outw...

concha, p. pino, d. ravera, l. rodriguez, e.

In this work, we classify all extended and generalized kinematical Lie algebras that can be obtained by expanding the so (2, 2) algebra. We show that the Lie algebra expansion method based on semigroups reproduces not only the original kinematical algebras but also a family of non- and ultra-relativistic algebras. Remarkably, the extended kinematic...

Blair, Chris D. A. Gallegos, Domingo Zinnato, Natale
Published in
Journal of High Energy Physics

We consider a non-relativistic limit of the bosonic sector of eleven-dimensional supergravity, leading to a theory based on a covariant ‘membrane Newton-Cartan’ (MNC) geometry. The local tangent space is split into three ‘longitudinal’ and eight ‘transverse’ directions, related only by Galilean rather than Lorentzian symmetries. This generalises th...

Karananas, Georgios K. Shaposhnikov, Mikhail Zell, Sebastian

We find the conditions under which scale-invariant Einstein-Cartan gravity with scalar matter fields leads to an approximate conformal invariance of the flat space particle theory up to energies of the order of the Planck mass. In the minimal setup, these models, in addition to the fields of the Standard Model and the graviton, contain only one ext...

Pueyo, Carlos Duaso Pajer, Enrico

Acknowledgements: We would like to thank Xingang Chen, Paolo Creminelli, Gerrit Farren, James Fergusson, Mehrdad Mirbabayi, Sebastien Renaux-Petel, Eva Silverstein, Wuhyun Sohn and Bowei Zhang for useful discussions. E.P. has been supported in part by the research program VIDI with Project No. 680-47-535, which is (partly) financed by the Netherlan...

Levi, Michèle Morales, Roger Yin, Zhewei

We confirm the generalized actions of the complete NLO cubic-in-spin interactions for generic compact binaries which were first tackled via an extension of the EFT of spinning gravitating objects. We first reduce these generalized actions to standard actions with spins, where the interaction potentials are found to consist of $6$ independent sector...

Chandrasekaran, Venkatesa Flanagan, Éanna É. Prabhu, Kartik
Published in
Journal of High Energy Physics

We study general relativity at a null boundary using the covariant phase space formalism. We define a covariant phase space and compute the algebra of symmetries at the null boundary by considering the boundary-preserving diffeomorphisms that preserve this phase space. This algebra is the semi-direct sum of diffeomorphisms on the two sphere and a n...