172 citations · 1.2k across the 49 of their papers we have counts for
9 papers · 1 filter
Formation of Merging Black Hole Binaries Inside Massive AGN Stars
Sizheng Ma, Douglas N. C. Lin, David A. Velasco-Romero
Stars embedded in the disks of active galactic nuclei (AGN) can grow to hundreds of solar masses, and the same disks are expected to host a population of stellar-mass black holes.…
From driven oscillations to free ringdown: a particle plunging into Kerr
Colin Weller, Andrew Laeuger, Fulin Li +5
We show that a ringdown waveform can admit a constant-coefficient quasinormal-mode (QNM) representation while its individual QNM-pole contributions remain driven. To establish this…
Complex frequency evolution of direct waves from binary black hole mergers
Ling Sun, Sizheng Ma, Patrick P. Chen +3
While no signal originating at a black hole's event horizon can reach future null infinity, information about the horizon and its immediate vicinity can be encoded in asymptotic pr…
High-accuracy drivers to simulate black hole binaries beyond general relativity with the fixing-the-equations approach
Guillermo Lara, Harald P. Pfeiffer, Nils Deppe +9
We implement the "fixing-the-equations" approach [Phys.Rev.D 96 (2017) 8, 084043] in spectre, an NR code using a pseudo-spectral discontinuous Galerkin scheme, to produce long and…
Towards long and accurate numerical relativity waveforms of binary black holes beyond general relativity
Guillermo Lara, Harald P. Pfeiffer, Nils Deppe +9
Numerical relativity (NR) simulations of compact binaries in theories beyond general relativity (GR) will be pivotal for the continued development of future tests of gravity with g…
Foundations of Direct Waves in Schwarzschild Ringdown
Sizheng Ma, Hai-Yang Wang
Recent studies have identified a new component in black-hole ringdown from merging binaries, termed the \emph{direct wave}. This component was argued to be tied to the dynamical so…
Prompt Response from Plunging Sources in Schwarzschild Spacetime
Sizheng Ma
Gravitational waves generated by moving sources in Schwarzschild spacetime can be decomposed into three principal components: quasinormal modes, tail, and prompt response. While th…
A nonlinear voice from GW250114 ringdown
Yi-Fan Wang, Sizheng Ma, Neev Khera +2
Gravitational-wave astronomy, by detecting ripples in spacetime, has opened a new window to observe compact objects and probe theories of gravity in the nonlinear strong-field regi…
Decomposition of Schwarzschild Green's Function
Junquan Su, Neev Khera, Marc Casals +3
We present a formulation of the spherically decomposed Green's function for a Schwarzschild black hole, based on a decomposition into two components, and , based on thei…