5 papers
Self-Consistent Parker Bound on Magnetic Monopoles
Chen Zhang, Chun-Yan Jiang, Nayun Jia +1
Magnetic monopoles arise generically in unified theories and offer a natural explanation of charge quantization. Beyond collider searches and cosmic-ray experiments, their flux is…
Dark radiation from Kerr primordial black holes: the role of superradiance
Nayun Jia, Chen Zhang, Xin Zhang
Light primordial black holes (PBHs) that fully evaporate before Big Bang Nucleosynthesis (BBN) produce dark radiation (DR) via Hawking radiation of gravitons, contributing to the e…
Superradiant dark matter production from primordial black holes: Impact of multiple modes and gravitational wave emission
Nayun Jia, Shou-Shan Bao, Chen Zhang +2
Rotating primordial black holes (PBHs) in the early universe can emit particles through superradiance, a process particularly efficient when the particle's Compton wavelength is co…
Evolution and detection of vector superradiant instabilities
Yin-Da Guo, Nayun Jia, Shou-Shan Bao +2
Ultralight vectors can extract energy and angular momentum from a Kerr black hole (BH) due to superradiant instability, resulting in the formation of a BH-condensate system. In thi…
Superradiant growth anomaly magnification in evolution of vector bosonic condensates bounded by a Kerr black hole with near-horizon reflection
Nayun Jia, Yin-Da Guo, Gui-Rong Liang +2
Ultralight vector particles can form evolving condensates around a Kerr black hole (BH) due to superradiant instability. We study the effect of near-horizon reflection on the evolu…