106 citations · 449 across the 13 of their papers we have counts for
13 papers
Detecting the Stochastic Gravitational Wave Background from Primordial Black Hole Formation
Sebastien Clesse, Juan García-Bellido, Stefano Orani
Primordial Black Holes (PBH) from peaks in the curvature power spectrum could constitute today an important fraction of the Dark Matter in the Universe. At horizon reentry, during…
What can we learn from the stochastic gravitational wave background produced by oscillons?
Stefan Antusch, Francesco Cefala, Stefano Orani
The stochastic gravitational wave (GW) background provides a fascinating window to the physics of the very early universe. Beyond the nearly scale-invariant primordial GW spectrum…
Oscillons from String Moduli
Stefan Antusch, Francesco Cefala, Sven Krippendorf +3
A generic feature of string compactifications is the presence of many scalar fields, called moduli. Moduli are usually displaced from their post-inflationary minimum during inflati…
Gravitational waves from oscillons after inflation
Stefan Antusch, Francesco Cefala, Stefano Orani
We investigate the production of gravitational waves during preheating after inflation in the common case of field potentials that are asymmetric around the minimum. In particular,…
Impact of other scalar fields on oscillons after hilltop inflation
Stefan Antusch, Stefano Orani
Oscillons are spatially localized and relatively stable field fluctuations which can form after inflation under suitable conditions. In order to reheat the universe, the fields whi…
Parametric resonance after hilltop inflation caused by an inhomogeneous inflaton field
Stefan Antusch, Francesco Cefala, David Nolde +1
We study preheating after hilltop inflation where the inflaton couples to another scalar field, e.g. a right-handed sneutrino, which provides a mechanism for generating the correct…
Hill crossing during preheating after hilltop inflation
Stefan Antusch, David Nolde, Stefano Orani
In 'hilltop inflation', inflation takes place when the inflaton field slowly rolls from close to a maximum of its potential (i.e. the 'hilltop') towards its minimum. When the infla…
False vacuum energy dominated inflation with large and the importance of
Stefan Antusch, Francesco Cefala, David Nolde +1
We investigate to which extent and under which circumstances false vacuum energy () dominated slow-roll inflation is compatible with a large tensor-to-scalar ratio $r = O(0.1)…
General analytic predictions of two-field inflation and perturbative reheating
Joseph Elliston, Stefano Orani, David J. Mulryne
The observational signatures of multi-field inflation will generally evolve as the Universe reheats. We introduce a general analytic formalism for tracking this evolution through p…
Hilltop inflation with preinflation from coupling to matter fields
Stefan Antusch, David Nolde, Stefano Orani
We propose a class of models of supersymmetric hilltop inflation (also called "new inflation") where the initial conditions of the inflaton close to the hilltop are generated throu…
Cosmological Perturbations from Hybrid Potentials
Stefano Orani
Cosmological inflation is the dominating paradigm to account for observations of the Cosmic Microwave Background (CMB). In this thesis, we study the phenomenology of a class of par…
Supersymmetric hybrid inflation with a light scalar
Stefano Orani, Arttu Rajantie
Light scalar fields present during inflation can lead to interesting observable signatures, especially in models with non-equilibrium reheating dynamics. We study a supersymmetric…
Non-Gaussianity from the hybrid potential
David Mulryne, Stefano Orani, Arttu Rajantie
We study the hybrid inflationary potential in a regime where the defect field is light, and more than 60 e-folds of accelerated expansion occur after the symmetry breaking transiti…