curvature perturbations 1gravitational waves 1hybrid inflation 1isocurvature perturbations 1primordial black holes 1
From the 1 of 2 linked papers with an AI index.
2 papers
astro-ph.CO2026
Superhorizon curvature perturbations in hybrid inflation revisited
Shi Pi, Anxianyi Xiong
The paper uses the δN formalism to study multi‑field inflation, showing that the tachyonic instability of the waterfall field in hybrid inflation can strongly amplify curvature per…
astro-ph.CO2025
Axion-like Universal Gravitational Wave Interpretation of Pulsar Timing Array Data
Kaloian D. Lozanov, Shi Pi, Misao Sasaki +2
Formation of cosmological solitons is generically accompanied by production of gravitational waves (GWs), with a universal GW background expected at frequency scales below that of…