116 citations · 551 across the 20 of their papers we have counts for
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astro-ph.CO2021★ 4 cited
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…
astro-ph.CO2021★ 78 cited
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…
astro-ph.CO2021★ 12 cited
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…