241 citations · 2.6k across the 97 of their papers we have counts for
99 papers
A Dark-matter Origin of Little Red Dots: Early Seeding and Super-Bondi Accretion
Hua-Peng Gu, Fangzhou Jiang, Xian Chen +2
The "Little red dots" (LRDs) are a population of accreting supermassive black holes (SMBHs) in the early Universe which often exhibit undermassive or even undetectable stellar host…
Near-Horizon Tidal Disruption Events
Yang Yang, Xian Chen
Tidal disruption events (TDEs) offer a unique dynamical probe of the spacetime geometry around supermassive black holes (SMBHs). While conventional TDEs occur around SMBHs of $M_\b…
Electromagnetic alignment and jet precession around supermassive black holes: Quasi-periodic oscillations in tidal disruption events
Pau Amaro-Seoane, Leif Lui, Alejandro Torres-Orjuela +1
We evaluate quasi-periodic oscillations and jet formation in tidal disruption events using the covariant formulation of electromagnetic angular-momentum transfer. General-relativis…
A model for the enhanced production rate of early-type hypervelocity stars in the Galactic halo
Chunyang Cao, F. K. Liu, Xian Chen +1
About twenty late B-type hypervelocity stars (HVSs) traveling faster than the Galactic escape velocity have been discovered in the Galactic halo, many of which were ejected from th…
Stellar rotation of S301 as a macroscopic gyroscope to test general relativity
Pau Amaro Seoane, Xian Chen, Alejandro Torres-Orjuela +16
Stellar trajectories around the Galactic Center provide a testing environment for general relativity. The intrinsic rotation of these stars evolves under covariant transport in cur…
A Whisper from Within: Response of a Pulsar Timing Array to an Internal Gravitational-wave Source
Houyuan Qi, Xian Chen, Lin Wang +1
Millisecond pulsars (MSPs) are abundant in globular clusters (GCs) and probably also in galactic nuclei. They offer the potential to form a miniature pulsar timing array (mini-PTA)…
Extreme Mass Ratio Inspirals in Light of Quasi-periodic Eruptions: Milli-Hertz Gravitational Wave Background
Brennen Black, Xian Chen, Zhen Pan
Quasi-periodic eruptions (QPEs) are repeated X-ray bursts originating in galactic nuclei. Of the many proposed models, the favored model is the disk-collision model in which a stel…
A Novel Method to Construct Frequency-Domain Gravitational Waveform for Accelerating Sources
Xinmiao Zhao, Han Yan, Xian Chen
Accurately modeling the inspiral-merger-ringdown (IMR) signal of coalescing compact objects is essential for the test of general relativity. However, it is known that astrophysical…
Constraining the Fraction of LIGO/Virgo/KAGRA Binary Black Hole Merger Events Associated with Active Galactic Nucleus Flares
Liang-Gui Zhu, Lei He, Xian Chen +1
The formation channels of binary black hole (BBH) mergers detected by the LIGO/Virgo/KAGRA (LVK) network remain uncertain. While BBH mergers occurring inside active galactic nucleu…
Relativistic Tidal Dissipation and the Gravitational-wave Signal of a White Dwarf Orbiting an Intermediate-Mass Black Hole
Yang Yang, Leif Lui, Alejandro Torres-Orjuela +1
Finding intermediate-mass black holes (IMBHs) and measuring their masses and spins are key to understanding massive black hole formation. White dwarf (WD)-IMBH binaries provide a u…
Non-Equilibrium Relativistic Core Collapse of Self-Interacting Dark Matter Halos -- Limits On Seed Black Hole Mass
Hua-Peng Gu, Fangzhou Jiang, Xian Chen +1
Recent observations of supermassive black holes (SMBHs) at high redshifts pose challenges to standard seeding mechanisms. Among competing models, the collapse of self-interacting d…
Thick Lunar Crust Amplifies Deci-Hertz Gravitational-Wave Signal
Lei Zhang, Han Yan, Xian Chen +1
Gravitational waves (GWs) in the Hz band encode unique signatures of the early universe and merging compact objects, but they are beyond the reach of existing observato…
Numerical simulation of lunar response to gravitational waves and its 3D topographic effect using the spectral-element method
Lei Zhang, Han Yan, Jinhai Zhang +1
The Moon has been regarded as a natural Weber bar capable of amplifying gravitational waves (GWs) for detecting events across a wide range of frequencies. However, accurately deter…
Gravitational radiation from Kerr black holes using the Sasaki-Nakamura formalism: Waveforms and fluxes at infinity
Yucheng Yin, Rico K. L. Lo, Xian Chen
In linear perturbation theory for Kerr black holes, there are two equivalent formalisms, namely the Teukolsky and the Sasaki-Nakamura (SN) formalism. Typically, one defaults to the…
Super amplification of lunar response to gravitational waves driven by thick crust
Lei Zhang, Jinhai Zhang, Han Yan +1
The Moon has been long regarded as a natural resonator of gravitational waves (GWs) since 1960, showing great potential to fill the frequency gap left behind GW detections by groun…
Detecting Intermediate-mass Black Holes Using Miniature Pulsar Timing Arrays in Globular Clusters
Xian Chen, Verónica Vázquez-Aceves, Siyuan Chen +3
Theoretical models predict that intermediate-mass black holes (IMBHs) exist in globular clusters (GCs), but observational evidence remains elusive. Millisecond pulsars (MSPs), whic…
Towards Realistic Detection Pipelines of Taiji: New Challenges in Data Analysis and High-Fidelity Simulations of Space-Based Gravitational Wave Antenna
Minghui Du, Pengcheng Wang, Ziren Luo +23
Taiji, a Chinese space-based gravitational wave (GW) detection project, aims to explore the millihertz GW universe with unprecedented sensitivity. By observing astrophysical and co…
The Emergence of Little Red Dots from Binary Massive Black Holes
Kohei Inayoshi, Jinyi Shangguan, Xian Chen +2
Little red dots (LRDs) are a newly identified class of broad-line active galactic nuclei (AGN) with a distinctive v-shape spectrum characterized by red optical and blue UV continuu…
Probing intermediate-mass black hole binaries with the Lunar Gravitational-wave Antenna
Hanlin Song, Han Yan, Yacheng Kang +3
New concepts for observing the gravitational waves (GWs) using a detector on the Moon, such as the Lunar Gravitational-wave Antenna (LGWA), have gained increasing attention. By uti…
Impact of mass transfer on the orbital evolution of a white dwarf close to an intermediate-mass black hole
Yang Yang, Jie Yang, Xian Chen +1
Extreme mass ratio inspirals (EMRIs) of low-mass white dwarfs (WDs, 0.1 - 0.3 Msun) around spinning intermediate-mass black holes (IMBHs, 10^3 - 10^5 Msun) offer unique opportuniti…
Formation Rate of Quasiperiodic Eruptions in Galactic Nuclei Containing Single and Dual Supermassive Black Holes
Chunyang Cao, F. K. Liu, Xian Chen +1
Quasiperiodic eruptions (QPEs) are a novel class of transients recently discovered in a few extragalactic nuclei. It has been suggested that a QPE can be produced by a main-sequenc…
2D numerical simulation of lunar response to gravitational waves using finite element method
Lei Zhang, Han Yan, Xian Chen +1
Previous studies of the response of the Moon to gravitational waves have been carried out using analytical or semi-analytical models assuming ideal lunar structures. Such models ar…
The fate of EMRI-IMRI pairs in AGN accretion disks: hydrodynamic and three body simulations
Peng Peng, Alessia Franchini, Matteo Bonetti +2
Extreme-mass-ratio inspirals (EMRIs) and intermediate-mass-ratio inspirals (IMRIs) are important gravitational wave (GW) sources for the Laser Interferometer Space Antenna (LISA).…
A Recent Supermassive Black Hole Binary in the Galactic Center Unveiled by the Hypervelocity Stars
Chunyang Cao, Fukun Liu, Shuo Li +2
When a binary of early-type stars from the young stellar populations in the Galactic center (GC) region is scattered to the vicinity of the supermassive black hole (SMBH) Sgr~$\rm{…