57 citations · 119 across the 7 of their papers we have counts for
7 papers
Constant-Roll Inflation: Analytical Formulae for Power Spectrum and Implications for Induced Gravitational Waves
Hayato Motohashi, Shi Pi, Yuichiro Tada +1
Constant-roll inflation provides a simple and analytically tractable framework for describing transient departures from slow roll, including non-attractor phases that can enhance t…
Natura Non Facit Saltum: An Analytical Model of Smooth Slow-Roll to Ultra-Slow-Roll Transition
Diego Cruces, Minxi He, Shi Pi +3
In this letter, we propose a single-field inflation model that realizes a slow-roll-to-ultra-slow-roll transition while keeping the second slow-roll parameter smoothly varying thro…
Unveiling Primordial Black Hole Relics Through Induced Gravitational Waves
Misao Sasaki, Jianing Wang
Black hole relics are of significant interest in cosmology and theoretical physics. In this work, we consider tiny primordial black holes (PBHs) ( $M_{\text {PBH }} \lesssim 10^7 \…
Primordial Black Hole Formation from Power Spectrum with Finite-width
Shi Pi, Misao Sasaki, Volodymyr Takhistov +1
Primordial black holes (PBHs) can form from gravitational collapse of large overdensities in the early Universe, giving rise to rich phenomena in astrophysics and cosmology. We dev…
Revisiting the Ultraviolet Tail of the Primordial Gravitational Wave
Shi Pi, Misao Sasaki, Ao Wang +1
High-frequency primordial gravitational waves (PGWs) with wave numbers larger than the Hubble parameter at the end of inflation are originated from the ultraviolet (UV) modes, whic…
Induced Gravitational Wave interpretation of PTA data: a complete study for general equation of state
Guillem Domènech, Shi Pi, Ao Wang +1
We thoroughly study the induced gravitational wave interpretation of the possible gravitational wave background reported by PTA collaborations, considering the unknown equation of…
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…