3 papers
astro-ph.HE2026
Heating Up the Black Hole X-ray Binary Accretion Disk by Superradiance
Antonios Kyriazis, Fengwei Yang, Siyu Zhou
A superradiant cloud of ultralight axions around a black hole, that is part of an X-ray binary system, can heat up its accretion disk and be detected by the thermal X-ray spectrum…
hep-ph2025
Axion forces in axion backgrounds
Yuval Grossman, Bingrong Yu, Siyu Zhou
Axions can naturally be very light due to the protection of an (approximate) shift symmetry. Because of their pseudoscalar nature, the long-range force mediated by the axion at tre…
hep-ph2023
The -philic scalar dark matter
Xun-Jie Xu, Siyu Zhou, Junyu Zhu
Right-handed neutrinos () offer an intriguing portal to new physics in hidden sectors where dark matter (DM) may reside. In this work, we delve into the simplest hidden sect…