5 papers
Stellar Superradiance and Low-Energy Absorption in Dense Nuclear Media
Zhaoyu Bai, Vitor Cardoso, Yifan Chen +3
Ultralight bosons such as axions and dark photons are well-motivated hypothetical particles, whose couplings to ordinary matter can be effectively constrained by stellar cooling. L…
Ultralight Boson Ionization from Comparable-Mass Binaries
Yuhao Guo, Zhen Zhong, Yifan Chen +3
Detection of gravitational waves enables probes of environmental effects around compact binaries. Ultralight bosons, well motivated in particle physics and capable of forming core-…
Probing Fundamental Constant Oscillation in the Galactic Center with S-Star Spectroscopy
Zhaoyu Bai, Vitor Cardoso, Yifan Chen +5
Astrophysical spectroscopy provides a powerful probe of spacetime variations of fundamental constants, as atomic and ionic emission and absorption lines depend sensitively on the f…
Dynamical Lensing Tomography of Black Hole Ringdown
Zhen Zhong, Vitor Cardoso, Yifan Chen
Strong gravitational lensing occurs when photons pass through the vicinity of a black hole. We investigate this phenomenon in the context of a gravitational-wave event, specificall…
Forward Ray Tracing and Hot Spots in Kerr Spacetime
Lihang Zhou, Zhen Zhong, Yifan Chen +1
Hotspots, often characterized as pointlike emissions, frequently appear near black holes with significantly enhanced luminosity compared to the surrounding accretion flow. Notably,…