Continuous spin field in the $\mathbf{AdS_6}$ space

Abstract

A representation of the $\mathfrak{so}(2,5)$ algebra corresponding to the continuous spin field in $\mathbf{AdS_6}$ is considered. The algebra is realized using the Lie-Lorentz derivative, which naturally incorporates $\mathbf{AdS_6}$ geometry and spin degrees of freedom. Within this framework, we derive explicit expressions for the Casimir operators in terms of both the covariant derivative and the spin invariants. The continuous spin representation under consideration is defined by a system of operator constraints that generalize those known for six-dimensional Minkowski space. We demonstrate that these constraints completely fix all Casimir operators of the $\mathfrak{so}(2,5)$ algebra, with the eigenvalues determined by a dimensional real parameter $\boldsymbol{\mu}$ and a positive (half-)integer $s$.