34 citations · 57 across the 8 of their papers we have counts for
8 papers
The Dual Primordial Black Hole Formation Scenario
Xinpeng Wang, Misao Sasaki, Ying-li Zhang
We report a novel mechanism where two families of primordial black holes (PBHs) may form at nearly the same comoving scales but at two different epochs. It is realized in two-stage…
formalism: A new formulation for the probability density of the curvature perturbation
Diego Cruces, Shi Pi, Misao Sasaki
formalism is a useful method to calculate the curvature perturbation. Contrary to what it is typically done in the literature, we re-formulate the formalism by using the…
Singular instantons with finite action
Misao Sasaki, Vicharit Yingcharoenrat, Ying-li Zhang
Recently, it was shown that in the absence of gravity there exist non--symmetric instanton solutions with finite action beyond Coleman's instantons. In this paper, focusing o…
Fundamental Physics and Cosmology with TianQin
Jun Luo, Haipeng An, Ligong Bian +33
The exploration of the surrounding world and the universe is an important theme in the legacy of humankind. The detection of gravitational waves is adding a new dimension to this g…
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…
Beyond Coleman's Instantons
Misao Sasaki, Vicharit Yingcharoenrat, Ying-li Zhang
In the absence of gravity, Coleman's theorem states that the -symmetric instanton solution, which is regular at the origin and exponentially decays at infinity, gives the low…
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…
Enhanced Curvature Perturbation and Primordial Black Hole Formation in Two-stage Inflation with a break
Xinpeng Wang, Ying-li Zhang, Misao Sasaki
We investigate a model of -gravity with a non-minimally coupled scalar field that gives rise to two-stage inflation with a break, that is, with an intermediate stage where inf…