241 citations · 2.6k across the 97 of their papers we have counts for
14 papers · 1 filter
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…
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…
Improving the Cosmological Constraints by Inferring the Formation Channel of Extreme-mass-ratio Inspirals
Liang-Gui Zhu, Hui-Min Fan, Xian Chen +2
Extreme-mass-ratio inspirals (EMRIs) could be detected by space-borne gravitational-wave (GW) detectors, such as the Laser Interferometer Space Antenna (LISA), TianQin and Taiji. L…
An Opacity-Free Method of Testing the Cosmic Distance Duality Relation Using Strongly Lensed Gravitational Wave Signals
Shun-Jia Huang, En-Kun Li, Jian-dong Zhang +4
The cosmic distance duality relation (CDDR), expressed as DL(z) = (1 + z)2DA(z), plays an important role in modern cosmology. In this paper, we propose a new method of testing CDDR…
LISA Definition Study Report
Monica Colpi, Karsten Danzmann, Martin Hewitson +108
The Laser Interferometer Space Antenna (LISA) is the first scientific endeavour to detect and study gravitational waves from space. LISA will survey the sky for Gravitational Waves…
Measuring the Hubble Constant Using Strongly Lensed Gravitational Wave Signals
Shun-Jia Huang, Yi-Ming Hu, Xian Chen +4
The measurement of the Hubble constant plays an important role in the study of cosmology. In this letter, we propose a new method to constrain the Hubble constant using the s…
The Dark Side of Using Dark Sirens to Constrain the Hubble-Lemaître Constant
Liang-Gui Zhu, Xian Chen
Dark sirens, i.e., gravitational-wave (GW) sources without electromagnetic counterparts, are new probes of the expansion of the universe. The efficacy of this method relies on corr…
Moving gravitational wave sources at cosmological distances: Impact on the measurement of the Hubble constant
Alejandro Torres-Orjuela, Xian Chen
Standard sirens - GW sources with an EM counterpart - can be used to measure H_0 directly which should help to ease the existing Hubble tension. However, if the source has a relati…
A Higher Probability of Detecting Lensed Supermassive Black Hole Binaries by LISA
Zucheng Gao, Xian Chen, Yi-Ming Hu +2
Gravitational lensing of gravitational waves (GWs) is a powerful probe of the matter distribution in the universe. Here we revisit the wave-optics effects induced by dark matter (D…
Excitation of gravitational wave modes by a center-of-mass velocity of the source
Alejandro Torres-Orjuela, Xian Chen, Pau Amaro Seoane
Most gravitational wave (GW) sources are moving relative to us. This motion is often closely related to the environment of the source and can thus provide crucial information about…
Relativistic mergers of black hole binaries have large, similar masses, low spins and are circular
Pau Amaro-Seoane, Xian Chen
Gravitational waves are a prediction of general relativity, and with ground-based detectors now running in their advanced configuration, we will soon be able to measure them direct…
The fragmenting past of the disk at the Galactic Center : The culprit for the missing red giants
Pau Amaro-Seoane, Xian Chen
Since 1996 we have known that the Galactic Center (GC) displays a core-like distribution of red giant branch (RGB) stars starting at ~ 10", which poses a theoretical problem, becau…
Enhanced off-center stellar tidal disruptions by supermassive black holes in merging galaxies
F. K. Liu, Xian Chen
Off-center stellar tidal disruption flares have been suggested to be a powerful probe of recoiling supermassive black holes (SMBHs) out of galactic centers due to anisotropic gravi…
Recoiling Supermassive Black Holes in Spin-flip Radio Galaxies
F. K. Liu, Dong Wang, Xian Chen
Numerical relativity simulations predict that coalescence of supermassive black hole (SMBH) binaries not only leads to a spin flip but also to a recoiling of the merger remnant SMB…