3 papers
astro-ph.CO2025
Can asteroid-mass PBHDM be compatible with catalyzed phase transition interpretation of PTA?
Jiahang Zhong, Chao Chen, Yi-Fu Cai
Primordial black holes (PBHs) can catalyze first-order phase transitions (FOPTs) in their vicinity, potentially modifying the gravitational wave (GW) signals from PTs. In this stud…
astro-ph.CO2025
Stochastic Axion-like Curvaton: Non-Gaussianity and Primordial Black Holes Without Large Power Spectrum
Chao Chen, Anish Ghoshal, Gianmassimo Tasinato +1
We discuss a mechanism of primordial black hole (PBH) formation that does not require specific features in the inflationary potential, revisiting previous literature. In this mecha…
hep-ph2025
Flipped Rotating Axion Non-minimally Coupled to Gravity: Baryogenesis and Dark Matter
Chao Chen, Suruj Jyoti Das, Konstantinos Dimopoulos +1
We demonstrate that the co-genesis of baryon asymmetry and dark matter can be achieved through the rotation of an axion-like particle, driven by a flip in the vacuum manifold's dir…