2 papers
math.AP2025
Feynman spectral action of the wave operator on asymptotically de Sitter spaces
Ruben Zeitoun
In this paper, we investigate the wave operator on non-trapping (at all energies) even asymptotically de Sitter spaces. We construct a Feynman operator on the conformal…
math-ph2024
Torsion and Lorentz symmetry from Twisted Spectral Triples
Pierre Martinetti, Gaston Nieuviarts, Ruben Zeitoun
By twisting the spectral triple of a riemannian spin manifold, we show how to generate an orthogonal and geodesic preserving torsion from a torsionless Dirac operator. We identify…