108 citations · 442 across the 9 of their papers we have counts for
9 papers
Non-Gaussianity after many-field reheating
Pedro Carrilho, David Mulryne, John Ronayne
We numerically investigate reheating after quadratic inflation with up to 65 fields, focusing on the production of non-Gaussianity. We consider several sets of initial conditions,…
Turning in the landscape: a new mechanism for generating Primordial Black Holes
Jacopo Fumagalli, Sébastien Renaux-Petel, John W. Ronayne +1
We propose a new model-independent mechanism for producing primordial black holes from a period of multi-field inflation. This requires an enhancement of primordial fluctuations at…
Higgs vacuum (in)stability during inflation: the dangerous relevance of de Sitter departure and Planck-suppressed operators
Jacopo Fumagalli, Sébastien Renaux-Petel, John W. Ronayne
The measured Standard Model parameters lie in a range such that the Higgs potential, once extrapolated up to high scales, develops a minimum of negative energy density. This has im…
Hyper non-Gaussianities in inflation with strongly non-geodesic motion
Jacopo Fumagalli, Sebastian Garcia-Saenz, Lucas Pinol +2
Several recent proposals to embed inflation into high-energy physics rely on inflationary dynamics characterized by a strongly non-geodesic motion in negatively curved field space.…
Primordial fluctuations and non-Gaussianities in sidetracked inflation
Sebastian Garcia-Saenz, Sébastien Renaux-Petel, John Ronayne
Heavy scalar fields can undergo an instability during inflation as a result of their kinetic couplings with the inflaton. This is known as the geometrical destabilization of inflat…
Attractor Behaviour in Multifield Inflation
Pedro Carrilho, David Mulryne, John Ronayne +1
We study multifield inflation in scenarios where the fields are coupled non-minimally to gravity via , where are coupling constants, the fields…