442 citations · 2.5k across the 33 of their papers we have counts for
15 papers · 1 filter
Superhorizon curvature perturbations in hybrid inflation revisited
Shi Pi, Anxianyi Xiong
We revisit cosmological perturbations in multi-field inflation using the formalism. By extending the analysis to directions transverse to the inflationary trajectory, we expli…
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…
Logarithmic Duality of the Curvature Perturbation
Shi Pi, Misao Sasaki
We study the comoving curvature perturbation in the single-field inflation models whose potential can be approximated by a piecewise quadratic potential by usi…
Primordial Black Hole Formation in Starobinsky's Linear Potential Model
Shi Pi, Jianing Wang
We study the power spectrum of the comoving curvature perturbation in the model that glues two linear potentials of different slopes, originally proposed by Starobinsky. W…
Primordial Black Hole Formation in Non-Minimal Curvaton Scenario
Shi Pi, Misao Sasaki
In the curvaton scenario, the curvature perturbation is generated after inflation at the curvaton decay, which may have a prominent non-Gaussian effect. For a model with a non-triv…
Primordial black holes and gravitational waves from resonant amplification during inflation
Zihan Zhou, Jie Jiang, Yi-Fu Cai +2
We present a new realization of the resonant production of primordial black holes as well as gravitational waves in a two-stage inflation model consisting of a scalar field ϕwith a…