5 papers
The Black Hole Window on Cosmic Inflation
Samuel Passaglia
We develop in this thesis the principles governing the production of our universe's primordial inhomogeneities during its early phase of inflation. As a guiding thread we ask what…
Primordial Black Holes as Dark Matter through Higgs Criticality
Samuel Passaglia, Wayne Hu, Hayato Motohashi
We study the dynamics of a spectator Higgs field which stochastically evolves during inflation onto near-critical trajectories on the edge of a runaway instability. We show that it…
Primordial Black Holes and Local Non-Gaussianity in Canonical Inflation
Samuel Passaglia, Wayne Hu, Hayato Motohashi
Primordial black holes (PBHs) cannot be produced abundantly enough to be the dark matter in canonical single-field inflation under slow roll. This conclusion is robust to local non…
Scalar Bispectrum Beyond Slow-Roll in the Unified EFT of Inflation
Samuel Passaglia, Wayne Hu
We present a complete formulation of the scalar bispectrum in the unified effective field theory (EFT) of inflation, which includes the Horndeski and beyond-Horndeski Gleyzes-Langl…
Reconciling tensor and scalar observables in G-inflation
Héctor Ramírez, Samuel Passaglia, Hayato Motohashi +2
The simple potential as an inflationary model is coming under increasing tension with limits on the tensor-to-scalar ratio and measurements of the scalar spectral inde…