The techniques of harmonic analysis of homogeneous spaces are reviewed, and applied to
the theory of propagators. The spectral geometry of homogeneous and, in particular, of …

This review is devoted to the intriguing and still largely unexplored links between string
theory and higher spins, the types of excitations that lie behind their most cherished …

We establish the full global non-linear stability of the Kerr–de Sitter family of black holes, as
solutions of the initial value problem for the Einstein vacuum equations with positive …

We derive the quadratic action for the physical degrees of freedom of massless spin-0, spin-
1, and spin-2 perturbations on a Schwarzschild-(A) dS background in arbitrary dimensions …

We determine the energy eigenvalues and eigenfunctions of the harmonic oscillator where
the coordinates and momenta are assumed to obey the modified commutation relations [xi …

In recent years, there has been considerable interest in theories formulated in anti-de Sitter
(AdS) spacetime. However, AdS spacetime fails to be globally hyperbolic, so a classical field …

Massive spin s⩾ 3/2 fields can become partially massless in cosmological backgrounds. In
the plane spanned by m2 and Λ, there are lines where new gauge invariances permit …

We study the decomposition of the Hilbert space of quantum field theory in $(d+ 1) $
dimensional de Sitter spacetime into Unitary Irreducible Representations (UIRs) of its …

Abstract The (m 2, Λ) plane of spin s> 1 massive fields in (anti-) de Sitter space backgrounds
is shown to consist of separate phases, divided by lines of novel “partially massless” gauge …

We study quantum field theories placed on a two-dimensional de Sitter spacetime (dS 2)
with an eye on the group-theoretic organization of single and multi-particle states. We …