149 citations · 1k across the 32 of their papers we have counts for
6 papers · 1 filter
Non-Polynomial Interactions as a Path Towards a Non-Renormalizable UV-Completion
Mikhail Shaposhnikov, Sebastian Zell
We propose a new class of single-field scalar quantum field theories with non-polynomial interactions leading to a two-point Green's function that can be naturally continued beyond…
Scale invariant Einstein-Cartan gravity and flat space conformal symmetry
Georgios K. Karananas, Mikhail Shaposhnikov, Sebastian Zell
We find the conditions under which scale-invariant Einstein-Cartan gravity with scalar matter fields leads to an approximate conformal invariance of the flat space particle theory…
Critical Points in Palatini Higgs Inflation with Small Non-Minimal Coupling
Arthur Poisson, Inar Timiryasov, Sebastian Zell
We investigate inflation driven by the Higgs boson in the Palatini formulation of General Relativity. Our analysis primarily focuses on a small non-minimal coupling of the Higgs fi…
Einstein-Proca theory from the Einstein-Cartan formulation
Will Barker, Sebastian Zell
We construct a theory of gravity in which a propagating massive vector field arises from a quadratic curvature invariant. The Einstein-Cartan formulation and a partial suppression…
Coupling Metric-Affine Gravity to the Standard Model and Dark Matter Fermions
Claire Rigouzzo, Sebastian Zell
General Relativity (GR) exists in different formulations, which are equivalent in pure gravity. Once matter is included, however, observable predictions generically depend on the v…
The Timescales of Quantum Breaking
Marco Michel, Sebastian Zell
Due to the inevitable existence of quantum effects, a classical description generically breaks down after a finite quantum break-time . We aim to find criteria for determining…