317 citations · 1.2k across the 32 of their papers we have counts for
33 papers
Breakdown of hydrodynamic universality in causal first-order viscous neutron star oscillations
Lennox S. Keeble, Alejandro Cárdenas-Avendaño
Hydrodynamic modeling of viscous neutron stars requires a choice of theory of relativistic hydrodynamics. That distinct formulations contain the same physical content in the long-w…
A Systematic Study of Resonance-Driven Flux Modifications in Extreme-Mass-Ratio Inspirals
Edoardo Levati, Lennox S. Keeble, Alejandro Cárdenas-Avendaño
Transient orbital resonances can introduce phase-dependent corrections to the evolution of extreme-mass-ratio inspirals (EMRIs), potentially altering their long-term dynamics and e…
: A Differentiable -based Code for Radiative Transfer in Curved Spacetimes
Pedro Naethe Motta, Ben S. Prather, Alejandro Cárdenas-Avendaño
Recent imaging of supermassive black holes by the Event Horizon Telescope (EHT) has relied on exhaustive parameter-space searches, matching observations to large, precomputed libra…
Estimating High-Order Time Derivatives of Kerr Orbital Functionals
Lennox S. Keeble, Alejandro Cárdenas-Avendaño
Functions of bound Kerr geodesic motion play a central role in many calculations in relativistic astrophysics, ranging from gravitational-wave generation to self-force and radiatio…
Cumulative effect of orbital resonances in extreme-mass-ratio inspirals
Edoardo Levati, Alejandro Cárdenas-Avendaño, Kyriakos Destounis +1
Orbital resonances in extreme-mass-ratio inspirals (EMRIs) have been proven to be a key feature for accurate gravitational-wave template modeling. Decades of research have led to s…
Inferring Black Hole Spin from Interferometric Measurements of the First Photon Ring: A Geometric Approach
Lennox S. Keeble, Alejandro Cárdenas-Avendaño, Daniel C. M. Palumbo
Accurately inferring black hole spin is crucial for understanding black hole dynamics and their astrophysical environments. In this work, we outline a geometric method for spin est…
Multi-Frequency Models of Black Hole Photon Rings from Low-Luminosity Accretion Disks
Tejahni Desire, Alejandro Cárdenas-Avendaño, Andrew Chael
Images of black holes encode both astrophysical and gravitational properties. Detecting highly-lensed features in images can differentiate between these two effects. We present an…
On turbulence for spacetimes with stable trapping
Gabriele Benomio, Alejandro Cárdenas-Avendaño, Frans Pretorius +1
Motivated by understanding the nonlinear gravitational dynamics of spacetimes admitting stably trapped null geodesics, such as ultracompact objects and black string solutions to ge…
Morphology of Relativistically Broadened Line Emission from Axisymmetric Equatorial Accretion Disks
Delilah E. A. Gates, Chau Truong, Amrita Sahu +1
Single-frequency emission from an accretion disk around a black hole is broadened into a line profile due to gravitational redshift and the motion of the disk's particles relative…
Measuring Black Hole Light Echoes with Very Long Baseline Interferometry
George N. Wong, Lia Medeiros, Alejandro Cárdenas-Avendaño +1
Light passing near a black hole can follow multiple paths from an emission source to an observer due to strong gravitational lensing. Photons following different paths take differe…
The Black Hole Explorer: Motivation and Vision
Michael D. Johnson, Kazunori Akiyama, Rebecca Baturin +65
We present the Black Hole Explorer (BHEX), a mission that will produce the sharpest images in the history of astronomy by extending submillimeter Very-Long-Baseline Interferometry…
The Black Hole Explorer: Photon Ring Science, Detection and Shape Measurement
Alexandru Lupsasca, Alejandro Cárdenas-Avendaño, Daniel C. M. Palumbo +6
General relativity predicts that black hole images ought to display a bright, thin (and as-of-yet-unresolved) ring. This "photon ring" is produced by photons that explore the stron…
Explanation for the absence of secondary peaks in black hole light curve autocorrelations
Alejandro Cárdenas-Avendaño, Charles Gammie, Alexandru Lupsasca
The observed radiation from hot gas accreting onto a black hole depends on both the details of the flow and the spacetime geometry. The lensing behavior of a black hole produces a…
Assessing the impact of instrument noise and astrophysical fluctuations on measurements of the first black hole photon ring
Alejandro Cárdenas-Avendaño, Lennox Keeble, Alexandru Lupsasca
Currently envisioned extensions of the Event Horizon Telescope to space will soon target the black hole photon ring: a narrow ring-shaped imprint of a black hole's strong gravity p…
New Horizons for Fundamental Physics with LISA
K. G. Arun, Enis Belgacem, Robert Benkel +138
The Laser Interferometer Space Antenna (LISA) has the potential to reveal wonders about the fundamental theory of nature at play in the extreme gravity regime, where the gravitatio…
Tidally-induced nonlinear resonances in EMRIs with an analogue model
David Bronicki, Alejandro Cárdenas-Avendaño, Leo C. Stein
One of the important targets for the future space-based gravitational wave observatory LISA is extreme mass ratio inspirals (EMRIs), where long and accurate waveform modeling is ne…
Chaos in Quadratic Gravity
Alexander Deich, Alejandro Cárdenas-Avendaño, Nicolas Yunes
While recent gravitational wave observations by LIGO and Virgo allow for tests of general relativity in the extreme gravity regime, these observations are still blind to a large sw…
Spherical accretion in alternative theories of gravity
Adam Bauer, Alejandro Cárdenas-Avendaño, Charles F. Gammie +1
The groundbreaking image of the black hole at the center of the M87 galaxy has raised questions at the intersection of observational astronomy and black hole physics. How well can…
Modeling uncertainties in X-ray reflection spectroscopy measurements II: Impact of the radiation from the plunging region
Alejandro Cardenas-Avendano, Menglei Zhou, Cosimo Bambi
X-ray reflection spectroscopy is a powerful tool to probe the strong gravity region around black holes, but the available relativistic reflection models have a number of simplifica…
Astrophysical and theoretical physics implications from multimessenger neutron star observations
Hector O. Silva, A. Miguel Holgado, Alejandro Cárdenas-Avendaño +1
The Neutron Star Interior Composition Explorer (NICER) recently measured the mass and equatorial radius of the isolated neutron star PSR J0030+0451. We use these measurements to in…
Gravitational-wave versus X-ray tests of strong-field gravity
Alejandro Cardenas-Avendano, Sourabh Nampalliwar, Nicolas Yunes
Electromagnetic observations of the radiation emitted by an accretion disk around a black hole, as well as gravitational wave observations of coalescing binaries, can be used to pr…
Experimental Relativity with Accretion Disk Observations
Alejandro Cardenas-Avendano, Jaxen Godfrey, Nicolas Yunes +1
Electromagnetic observations have been used over the past decades to understand the nature of black holes and the material around them. Our ability to learn about the fundamental p…
Stealth Chaos due to Frame Dragging
Andrés F. Gutiérrez-Ruiz, Alejandro Cárdenas-Avendaño, Nicolás Yunes +1
While the geodesic motion around a Kerr black hole is fully integrable and therefore regular, numerical explorations of the phase-space around other spacetime configurations, with…
The exact dynamical Chern Simons metric for a spinning black hole possesses a fourth constant of motion: A Dynamical-Systems-Based Conjecture
Alejandro Cardenas-Avendano, Andres F. Gutierrez, Leonardo A. Pachon +1
The recent gravitational wave observations by the LIGO/Virgo collaboration have allowed the first tests of General Relativity in the extreme gravity regime, when comparable-mass bl…