6 papers
Spinor-helicity formalism for continuous-spin particles
Thomas Basile, Xavier Bekaert, Felipe Figueroa +1
We propose a new formulation of continuous-spin particles (CSP) with the help of a single two-component spinor to build asymptotic states. This formulation allows to write down amp…
A geometrical invitation to BMS group theory
Xavier Bekaert, Yannick Herfray, Lea Mele +1
In these lecture notes, a group-theoretical introduction to BMS symmetries is provided in a self-contained manner. More precisely, all definitions and structures are purely based o…
Higher-Spin Poisson Sigma Models and Holographic Duality for SYK Models
Xavier Bekaert, Alexey Sharapov, Evgeny Skvortsov
SYK models provide an interesting playground for exploring the correspondence. We focus on a class of SYK models that exhibit higher-spin symmetry, whose gravity sect…
BMS representations for generic supermomentum
Xavier Bekaert, Yannick Herfray
We revisit the classification, and give explicit realisations, of unitary irreducible representations of the BMS group. As compared to McCarthy's seminal work, we make use of a uni…
Classification of Conformal Carroll Algebras
Hamid Afshar, Xavier Bekaert, Mojtaba Najafizadeh
We classify a one-parameter family, , of conformal extensions of the Carroll algebra in arbitrary dimension with being the anisotropic scaling expon…
Asymptotic behaviour of massless fields and kinematic duality between interior null cones and null infinity
Xavier Bekaert, S. I. Aadharsh Raj
The relation between two branches of solutions (radiative and subradiative) of wave equations on Minkowski spacetime is investigated, for any integer spin, in flat Bondi coordinate…