Publications (52)
How Dilatation Invariance Suppresses Loop Corrections to Curvature Perturbations on CMB Scales
Danilo Artigas, Shi Pi, Takahiro Tanaka +1
Departures from standard slow-roll (SR) inflation have attracted increasing interest in recent years. In particular, scenarios that strongly enhance the power spectrum of the curva…
Scalaron from -gravity as a Heavy Field
Shi Pi, Ying-li Zhang, Qing-Guo Huang +1
We study a model of inflation in which a scalar field is non-minimally coupled to Starobinsky's gravity. After transforming it to the Einstein frame, a new scalar field,…
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…
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 us…
Universal infrared scaling of gravitational wave background spectra
Rong-Gen Cai, Shi Pi, Misao Sasaki
We study the general infrared behavior of the power spectrum of a stochastic gravitational wave background produced by stress tensor in the form bilinear in certain dynamical degre…
Constant roll and non-Gaussian tail in light of logarithmic duality
Ryoto Inui, Hayato Motohashi, Shi Pi +2
The curvature perturbation in a model of constant-roll (CR) inflation is interpreted in view of the logarithmic duality discovered in Ref. [1] according to the formalism. We…