144 citations · 966 across the 27 of their papers we have counts for
27 papers
From Inspiral to Expansion: The Wake-Driven Torque on Binary Black Holes in Gaseous Medium
Jixuan Yang, Lile Wang, Xinyu Li +1
Binary black holes (BBHs) in gaseous medium, such as active galactic nucleus (AGN) disks, are important gravitational-wave sources, yet the gas-driven torque that governs their orb…
Tidal Heating of Stellar Clusters in Fuzzy Dark Matter Halos
Yiheng Liu, Xinyu Li
Ultra-faint dwarf galaxies serve as powerful testing grounds for wave dark matter models through dynamical stellar heating. Previous simulation-based work derived a lower bound on…
Electromagnetic Signatures of Supermassive Binary Black Holes: Synchrotron, Self-Lensing Flares, and Jet Precession
Hong-Xuan Jiang, Xinyu Li, Jing-Ze Xia +3
The recent evidence for a nanohertz gravitational wave background from Pulsar Timing Arrays highlights the urgent need to identify electromagnetic counterparts to supermassive bina…
Black Hole Collisions With Thin Accretion Disks: OJ 287 and Small-Mass-Ratio Supermassive Black Hole Binary Candidates
Sean M. Ressler, Luciano Combi, Bart Ripperda +1
OJ 287 is the best-known supermassive black hole binary candidate in the nanohertz gravitational wave band. It exhibits periodic flares every 12 years, likely caused by coll…
A Promise for the JWST era: Massive black holes directly collapsed from wave dark matter haloes, and Star formation in and around their accretion flows
Xiaobo Dong, Yongda Zhu, Marcia Rieke +7
There are several puzzling phenomena from recent JWST observations, which seem to push the standard ΛCDM cosmology over the edge. All those puzzles can be understood in a coherent…
Force-free wave interaction in magnetar magnetospheres: Computational modeling in axisymmetry
Jens F. Mahlmann, Miguel Á. Aloy, Xinyu Li
Crustal quakes of highly magnetized neutron stars can disrupt their magnetospheres, triggering energetic phenomena like X-ray and fast radio bursts (FRBs). Understanding plasma wav…
Black Hole-Disk Interactions in Magnetically Arrested Active Galactic Nuclei: General Relativistic Magnetohydrodynamic Simulations Using A Time-Dependent, Binary Metric
Sean M. Ressler, Luciano Combi, Xinyu Li +2
Perturber objects interacting with supermassive black hole accretion disks are often invoked to explain observed quasi-periodic behavior in active galactic nuclei (AGN). We present…
If dark matter is fuzzy, the first stars form in massive pancakes
Mihir Kulkarni, Eli Visbal, Greg L. Bryan +1
Fuzzy dark matter (FDM) is a proposed modification for the standard cold dark matter (CDM) model motivated by small-scale discrepancies in low-mass galaxies. Composed of ultra-ligh…
Propagation of a Strong Fast Magnetosonic Wave in the Magnetosphere of a Neutron Star
Alexander Y. Chen, Yajie Yuan, Xinyu Li +1
We study the propagation of a strong, low frequency, linearly polarized fast magnetosonic wave inside the magnetosphere of a neutron star. The relative strength of the wave…
An Intermediate-field Fast Radio Burst Model and the Quasi-periodic Oscillation
Jieshuang Wang, Xinyu Li, Zigao Dai +1
Quasi-periodic oscillation (QPO) signals are discovered in some fast radio bursts (FRBs) such as FRB 20191221A, as well as in the X-ray burst associated with the galactic FRB from…
Quantum fluctuations masquerade as halos: Bounds on ultra-light dark matter from quadruply-imaged quasars
Alexander Laroche, Daniel Gilman, Xinyu Li +2
Ultra-light dark matter (ULDM) refers to a class of theories, including ultra-light axions, in which particles with mass comprise a significant fraction…
Dynamical Effects of Colliding Outflows in Binary Systems
Lile Wang, Xinyu Li
The outflow of an object traveling in a fluid can shape the fluid morphology by forming a forward bow shock which accelerates the object via gravitational feedback. This dynamical…
Construction of Wave Dark Matter Halos: Numerical Algorithm and Analytical Constraints
Tomer D. Yavetz, Xinyu Li, Lam Hui
We present a wave generalization of the classic Schwarzschild method for constructing self-consistent halos -- such a halo consists of a suitable superposition of waves instead of…
Fast dissipation of Colliding Alfvén Waves in a Magnetically Dominated Plasma
Xinyu Li, Andrei M. Beloborodov, Lorenzo Sironi
Magnetic energy around compact objects often dominates over plasma rest mass, and its dissipation can power the object luminosity. We describe a dissipation mechanism which works f…
Neutrino Fast Flavor Conversions in Neutron-star Post-Merger Accretion Disks
Xinyu Li, Daniel M. Siegel
A compact accretion disk may be formed in the merger of two neutron stars or of a neutron star and a stellar-mass black hole. Outflows from such accretion disks have been identifie…
Don't cross the streams: caustics from Fuzzy Dark Matter
Neal Dalal, Jo Bovy, Lam Hui +1
We study how tidal streams from globular clusters may be used to constrain the mass of ultra-light dark matter particles, called `fuzzy' dark matter (FDM). A general feature of FDM…
Oscillations and Random Walk of the Soliton Core in a Fuzzy Dark Matter Halo
Xinyu Li, Lam Hui, Tomer D. Yavetz
A Fuzzy Dark Matter (FDM) halo consists of a soliton core close to the center and an NFW-like density profile in the outer region. Previous investigations found that the soliton co…
Relativistic Alfvén Waves Entering Charge Starvation in the Magnetospheres of Neutron Stars
Alexander Y. Chen, Yajie Yuan, Andrei M. Beloborodov +1
Instabilities in a neutron star can generate Alfvén waves in its magnetosphere. Propagation along the curved magnetic field lines strongly shears the wave, boosting its electric cu…
Vortices and waves in light dark matter
Lam Hui, Austin Joyce, Michael J. Landry +1
In a galactic halo like the Milky Way, bosonic dark matter particles lighter than about eV have a de Broglie wavelength larger than the average inter-particle separation and a…
Simulation of a Compact Object with Outflows Moving Through a Gaseous Background
Xinyu Li, Philip Chang, Yuri Levin +2
A compact object moving relative to surrounding gas accretes material and perturbs the density of gas in its vicinity. In the classical picture of Bondi-Hoyle-Lyttleton accretion,…
Consequences of Energetic Magnetar-Like Outbursts of Nearby Neutron Stars: C Events and the Cosmic Electron Spectrum
F. Y. Wang, Xinyu Li, D. O. Chernyshov +3
Four significant events of rapid C increase have taken place within the past several thousand years. The physical origin of these rapid increases is still a mystery but must…
Black Hole Hair from Scalar Dark Matter
Lam Hui, Daniel Kabat, Xinyu Li +2
We show that a black hole surrounded by scalar dark matter develops scalar hair. This is the generalization of a phenomenon pointed out by Jacobson, that a minimally coupled scalar…
Dissipation of Alfvén Waves in Relativistic Magnetospheres of Magnetars
Xinyu Li, Jonathan Zrake, Andrei M. Beloborodov
Magnetar flares excite strong Alfvén waves in the magnetosphere of the neutron star. The wave energy can (1) dissipate in the magnetosphere, (2) convert to "fast modes" and possibl…
Numerical and Perturbative Computations of the Fuzzy Dark Matter Model
Xinyu Li, Lam Hui, Greg L. Bryan
We investigate nonlinear structure formation in the fuzzy dark matter (FDM) model using both numerical and perturbative techniques. On the numerical side, we examine the virtues an…