Research

Our group integrates general relativity, computational astrophysics, and multi‑wavelength observations to investigate black holes and neutron stars. Below are our four current thrusts.

Horizon‑Scale Imaging & Tests of Gravity

We reconstruct and interpret horizon‑scale images of supermassive black holes (M87*, Sgr A*) to probe strong‑field gravity and relativistic plasma dynamics. We advance ML algorithms for mm/sub‑mm VLBI (e.g., KRISP/PRIMO), quantify systematics, and connect image morphology/polarization to spacetime and accretion physics.

Selected Publications

Space‑Based Interferometry & Future Missions

We evaluate targets, frequencies, and architectures for space‑based VLBI to resolve a large number of black‑hole shadows and jets. Our goal is to develop a mission concept capable of expanding precision tests of gravity and accretion physics and image binary black holes emitting gravitational waves.

Selected Publications

Neutron Star Structure & Dense Matter

Using X-ray spectra, pulse‑profile modeling, and multi‑messenger data, we infer masses, radii, and the dense‑matter equation of state. We develop statistical frameworks to uncover correlations and biases and to synthesize constraints from X‑ray timing, spectroscopy, and gravitational‑wave observations.

Selected Publications

Accretion & Plasma Microphysics

We develop GRMHD, PIC, and hybrid kinetic–GRMHD frameworks and electron thermodynamics models to capture particle heating and acceleration, reconnection, and wave cascades in radiatively inefficient accretion flows. These results inform multi‑scale simulations and predict observables for current and future facilities.

Selected Publications

Collaborations

Event Horizon Telescope • NICER • ALMA & multi‑wavelength campaigns

Active Grants & Roles

NASA FINESST (PI, 2025–2028) • NASA ATP (PI) • NSF/Chandra/NASA awards