317 citations · 1.2k across the 32 of their papers we have counts for
23 papers · 1 filter
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…
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…
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…
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…
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…
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…
Iron K line of boson stars
Zheng Cao, Alejandro Cardenas-Avendano, Menglei Zhou +3
The present paper is a sequel to our previous work [Y. Ni et al., JCAP 1607, 049 (2016)] in which we studied the iron K line expected in the reflection spectrum of Kerr black ho…
Iron K line of Kerr black holes with scalar hair
Yueying Ni, Menglei Zhou, Alejandro Cardenas-Avendano +3
Recently, a family of hairy black holes in 4-dimensional Einstein gravity minimally coupled to a complex, massive scalar field was discovered~\cite{hbh}. Besides the mass and s…
Search for astrophysical rotating Ellis wormholes with X-ray reflection spectroscopy
Menglei Zhou, Alejandro Cardenas-Avendano, Cosimo Bambi +2
Recently, two of us have found numerically rotating Ellis wormholes as solutions of 4-dimensional Einstein gravity coupled to a phantom field. In this paper, we investigate possibl…
Testing the Kerr black hole hypothesis: comparison between the gravitational wave and the iron line approaches
Alejandro Cardenas-Avendano, Jiachen Jiang, Cosimo Bambi
The recent announcement of the detection of gravitational waves by the LIGO/Virgo collaboration has opened a new window to test the nature of astrophysical black holes. Konoplya &…
Wormholes and nonsingular space-times in Palatini gravity
Cosimo Bambi, Alejandro Cardenas-Avendano, Gonzalo J. Olmo +1
We reconsider the problem of theories of gravity coupled to Born-Infeld theory of electrodynamics formulated in a Palatini approach, where metric and connection are independ…
Gravitational lensing in the strong field limit for Kar's metric
Carlos A. Benavides, Alejandro Cardenas-Avendano, Alexis Larranaga
In this paper we calculate the strong field limit deflection angle for a light ray passing near a scalar charged spherically symmetric object, described by a metric which comes fro…
A General Class of Regular Black Holes based on a Smeared Mass Distribution
Alexis Larranaga, Alejandro Cardenas-Avendano, Daniel Alexdy Torres
This article has been withdrawn by arXiv admins due to excessive reuse of content from other authors. We also note that this article has been retracted from Physics Letters B at ht…