19 citations · 32 across the 6 of their papers we have counts for
6 papers
The limits of lattice inflation: a cautionary tale
Will Barker, Benjamin Gladwyn, Sebastian Zell
Cosmological lattice simulations have become important tools for studying non-perturbative dynamics in the early Universe. Many widely used codes, however, approximate the gravitat…
A non-compact QCD axion
Georgios K. Karananas, Mikhail Shaposhnikov, Sebastian Zell
We investigate the cosmology of an axion that is fundamentally non-compact. During inflation, fluctuations of the effectively massless field populate many QCD vacua, thereby evadin…
On Non-Minimal Couplings to Gravity and Axion Isocurvature Bounds
Claire Rigouzzo, Sebastian Zell
For axions present during inflation, it has been shown that a non-minimal coupling of the inflaton to gravity worsens isocurvature bounds, while a non-minimal coupling …
Warm Inflation with the Standard Model
Kim V. Berghaus, Marco Drewes, Sebastian Zell
We show for the first time that warm inflation is feasible with Standard Model (SM) gauge interactions alone. Our model consists of a minimal extension of the SM by a single scalar…
No Warm Inflation From a Vanilla Axion
Sebastian Zell
At finite temperature, the coupling of an axion to non-Abelian gauge fields causes dissipation due to sphaleron heating. This mechanism has been considered as ideal for realizing w…
On Sphaleron Heating in the Presence of Fermions
Marco Drewes, Sebastian Zell
Axion-like particles with a coupling to non-Abelian gauge fields at finite temperature can experience dissipation due to sphaleron heating. This could play an important role for wa…