5 papers
Relativistic Thermal Emission from Accretion Disks in Kerr-MOG Spacetimes
Cheng Liu, Xu-fan Hu, Yosuke Mizuno +1
In Scalar-Tensor-Vector Gravity (STVG, also known as MOG), a massive vector field generates a repulsive fifth force that endows rotating black holes with a gravitational ch…
Signature of iron line profile from a Kerr-like wormhole
Cheng Liu, Hoongwah Siew, Hong-Xuan Jiang +2
Broad, skewed iron K emission lines in the X-ray spectra of accreting black holes encode key information about the spacetime geometry of the innermost disk. While the Kerr metr…
Two distinct types of echoes in compact objects
Shui-Fa Shen, Kai Lin, Tao Zhu +3
In the black hole perturbation theory framework, two different physical pictures for echoes in compact objects have been proposed. The first mechanism interprets echoes as repeated…
Observational test of spacetimes with the S2 star in the Milky Way galactic center
Jian-Ming Yan, Tao Zhu, Mustapha Azreg-Aïnou +2
A novel class of vacuum metrics expressible in analytical form was recently found for pure gravity, based on a groundwork put forth by Buchdahl in 1962. These Buchda…
The Heavier the Faster: A Sub-population of Heavy, Rapidly Spinning and Quickly Evolving Binary Black Holes
Wei-Hua Guo, Yin-Jie Li, Yuan-Zhu Wang +4
The spins of binary black holes (BBHs) measured from gravitational waves carry notable information of the formation pathways. Here we propose a quantity "dimensionless net spin" ($…