82 citations · 398 across the 15 of their papers we have counts for
15 papers
Banana integrals in configuration space
Sergio Luigi Cacciatori, Henri Epstein, Ugo Moschella
We reconsider the computation of banana integrals at different loops, by working in the configuration space, in any dimension. We show how the 2-loop banana integral can be compute…
QFT and topology in two dimensions: -symmetry and the de Sitter universe
Henri Epstein, Ugo Moschella
We study bosonic Quantum Field Theory on the double covering of the 2-dimensional de Sitter universe, identified to a coset space of the group …
A rigorous lower bound on the scattering amplitude at large angle
Henri Epstein, André Martin
We prove a lower bound for the modulus of the amplitude for a two-body process at large scattering angle. This is based on the interplay of the analyticity of the amplitude and the…
Topological surprises in de Sitter QFT in two-dimensions
Henri Epstein, Ugo Moschella
Motivated by the study of soluble models of quantum field theory, we illustrate a new type of topological effect by comparing the constructions of canonical Klein-Gordon quantum fi…
de Sitter symmetry of Neveu-Schwarz spinors
Henri Epstein, Ugo Moschella
We study the relations between Dirac fields living on the 2-dimensional Lorentzian cylinder and the ones living on the double-covering of the 2-dimensional de Sitter manifold, here…
de Sitter tachyons and related topics
Henri Epstein, Ugo Moschella
We present a complete study of a family of tachyonic scalar fields living on the de Sitter universe. We show that for an infinite set of discrete values of the negative squared mas…