116 citations · 551 across the 20 of their papers we have counts for
14 papers · 1 filter
The backreaction effect of the sound speed resonance in DBI inflation
Bichu Li, Chao Chen, Bo Wang
We examine the backreaction effect of the enhanced small-scale scalar perturbations from the sound speed resonance (SSR) mechanism for primordial black hole formation in Dirac-Born…
Growth of curvature perturbations for PBH formation \& detectable GWs in non-minimal curvaton scenario revisited
Chao Chen, Anish Ghoshal, Zygmunt Lalak +2
We revisit the growth of curvature perturbations in non-minimal curvaton scenario with a non-trivial field metric where is an inflaton field, and incorporate the effect…
Rapidly growing primordial black holes as seeds of the massive high-redshift JWST Galaxies
Guan-Wen Yuan, Lei Lei, Yuan-Zhu Wang +6
A group of massive galaxies at redshifts of have been recently detected by the James Webb Space Telescope (JWST), which were unexpected to form so early within the fra…
Primordial black hole mass functions as a probe of cosmic origin
Yi-Fu Cai, Chengfeng Tang, Geyu Mo +7
We discuss a novel window to probe the origin of our universe via the mass functions of primordial black holes (PBHs). The mass functions of PBHs are simply estimated using the con…
Sudden braking and turning with a two-field potential bump: primordial black hole formation
Chengjie Fu, Chao Chen
We investigate the amplification of curvature perturbations in a two-field inflation model featuring a Gaussian potential bump. When the inflaton encounters a potential bump along…
Missing one-loop contributions in secondary gravitational waves
Chao Chen, Atsuhisa Ota, Hui-Yu Zhu +1
We find several missing one-loop-order contributions in previous considerations about secondary gravitational waves induced at nonlinear order in cosmological perturbations. We con…
Induced gravitational waves from statistically anisotropic scalar perturbations
Chao Chen, Atsuhisa Ota
Scalar-induced gravitational waves (SIGWs) are attracting growing attention for probing extremely short-scale scalar perturbations via gravitational wave measurements. In this pape…
Cosmological Standard Timers from Unstable Primordial Relics
Yi-Fu Cai, Chao Chen, Qianhang Ding +1
In this article we study a hypothetical possibility of tracking the evolution of our Universe by introducing a series of the so-called standard timers. Any unstable primordial reli…
Primordial black holes and stochastic gravitational wave background from inflation with a noncanonical spectator field
Rong-Gen Cai, Chao Chen, Chengjie Fu
We investigate the enhancement of the curvature perturbations in a single-field slow-roll inflation with a spectator scalar field kinetically coupled to the inflaton. The coupling…
Ultrahigh-energy Gamma Rays and Gravitational Waves from Primordial Exotic Stellar Bubbles
Yi-Fu Cai, Chao Chen, Qianhang Ding +1
We put forward a novel class of exotic celestial objects that can be produced through phase transitions occurred in the primordial Universe. These objects appear as bubbles of stel…
Impacts of Hawking Radiation from Primordial Black Holes in Critical Collapse Model on the Light Element Abundances
Yudong Luo, Chao Chen, Motohiko Kusakabe +1
We study the photodisintegration process triggered by the nonthermal electromagnetic Hawking radiation from primordial black holes (PBHs) in critical collapse model. We consider th…
Dirac-Born-Infeld realization of sound speed resonance mechanism for primordial black holes
Chao Chen, Xiao-Han Ma, Yi-Fu Cai
We present a concrete realization of the sound speed resonance (SSR) mechanism for primordial black hole (PBH) formation within a specific model of Dirac-Born-Infeld (DBI) inflatio…
Primordial black holes from sound speed resonance in the inflaton-curvaton mixed scenario
Chao Chen, Yi-Fu Cai
We study sound speed resonance (SSR) mechanism for primordial black hole (PBH) formation in an early universe scenario with inflaton and curvaton being mixed. In this scenario, the…
When Primordial Black Holes from Sound Speed Resonance Meet a Stochastic Background of Gravitational Waves
Yi-Fu Cai, Chao Chen, Xi Tong +2
As potential candidates of dark matter, primordial black holes (PBHs) are within the core scopes of various astronomical observations. In light of the explosive development of grav…