EHT data show a 51.8 microarcsecond ring around Sgr A* consistent with the shadow of a 4 million solar mass Kerr black hole viewed at moderate inclination.
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First m87 event horizon telescope results. i. the shadow of the supermassive black hole
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Calypso is a parameter-conditioned stochastic surrogate model for circumbinary accretion flows using PCA and multivariate Gaussian modeling, released as open-source software with a closed-form likelihood for parameter inference from time series.
Red quasars are intrinsically X-ray weak with low alpha_OX values, tracing a distinct evolutionary stage of suppressed black hole accretion relative to stellar mass growth.
SPHEREx data confirm 77 new luminous heavily reddened quasars at 1.5<z<3.9 that are hot-dust poor relative to unobscured quasars, supporting a blow-out feedback phase.
Scalarized Kerr-Newman black holes develop an inner photon shell that produces an additional critical curve and distinct crescent-like higher-order images unlike those in Kerr spacetime.
Targeted PTA searches for CWs from 114 AGN in NANOGrav 15 yr data yield no detections, factor-of-two tighter limits than all-sky searches, and updated constraints ruling out part of the parameter space for a binary in 3C 66B.
ShardTensor is a domain-parallelism system for SciML that enables flexible scaling of extreme-resolution spatial datasets by removing the constraint of batch size one per device.
Low-luminosity AGN exhibit optical variability structure function slopes that increase with black hole mass from ~0.1 to ~0.3, with amplitude anticorrelated with luminosity, no breaks observed, and variability continuing to rise on 20-year timescales.
A new complete gauge fixing at initial data via Hodge decomposition on complete Riemannian manifolds enables existence proofs for Hadamard states in the quantization of Maxwell theory on globally hyperbolic Lorentzian manifolds.
Quasinormal modes for three spin fields on Einstein-Skyrme AdS black holes exhibit a mild overtone anomaly and confirm strong cosmic censorship with Christodoulou parameter β much smaller than 1/2.
Evolved stars with radii ≳500 R_⊙ in nuclear star clusters can eclipse mm radio cores of nearby radio-loud AGN with ~10% relative depth, recurrence times ≳10 years, and durations ~10 days, enabling inference of SMBH masses and NSC composition.
JWST spectroscopy reveals radio jets in nearby AGN drive multiphase ISM turbulence and shock-dominated H2 excitation both along and perpendicular to the jet direction.
The orbital nodal phase Δψ_orb equals the nodal precession per orbit and serves as a pipeline-invariant baseline for Kerr black hole timing in the thin-ring limit.
Computations for a new black hole metric with magnetic charge and Hernquist halo show that charge raises QNM frequencies while the halo lowers them, with similar opposing effects on shadow size and neutrino annihilation efficiency.
Numerical simulations show Shannon entropy and MIPP indicators distinguish chaotic from regular orbits of charged particles near weakly magnetized black holes in Einstein-ModMax theory, with parameters restricted by EHT shadow observations.
Bounded polymerization in asymmetric LQG-inspired bounce models makes shell-crossing singularities unavoidable for inhomogeneous dust collapse, whereas unbounded polymerization in non-bouncing models permits avoidance for suitable decreasing initial profiles.
Numerical geodesics show narrow deflection angles for massive particle scattering off RN black holes versus isotropic scattering off naked singularities.
Applies KCC theory for Jacobi stability analysis of geodesics in dynamical Chern-Simons rotating black holes and compares advantages versus Lyapunov stability.
The shadow of a Kerr-Newman-like black hole in Bumblebee gravity with plasma is analyzed via observables and constrained by M87* EHT data, with spin and Lorentz violation mainly distorting the shape while charge and plasma shrink the size.
Dark matter halo parameters amplify the scale of closed timelike orbits in Schwarzschild spacetime, inducing phase lags in gravitational waves while light curves retain distinguishable peaks for certain orbital features.
Bardeen-like black holes produce ℓ-dependent corrections to weak-field deflection and strong-field lensing observables that remain consistent with observations but may distinguish them from Schwarzschild black holes.
GPUmonty delivers a 12x speedup over grmonty by parallelizing superphoton operations on GPUs while keeping errors below 1% in tests against analytic solutions and prior codes.
Stochastic trajectories near Schwarzschild horizons are shaped by gravitational fluctuations, producing different behaviors depending on angular momentum, particle frequency, and integration time.
Derives slow-roll observables and consistency relations for scalar-tensor Gauss-Bonnet inflation and fits a specific model to Planck data.
citing papers explorer
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First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
EHT data show a 51.8 microarcsecond ring around Sgr A* consistent with the shadow of a 4 million solar mass Kerr black hole viewed at moderate inclination.
-
\texttt{calypso}: a Parameter-Conditioned Stochastic Surrogate Model for Circumbinary Accretion Time-Series
Calypso is a parameter-conditioned stochastic surrogate model for circumbinary accretion flows using PCA and multivariate Gaussian modeling, released as open-source software with a closed-form likelihood for parameter inference from time series.
-
SDSS-V: Revealing a weak accretion state in X-ray selected red quasars
Red quasars are intrinsically X-ray weak with low alpha_OX values, tracing a distinct evolutionary stage of suppressed black hole accretion relative to stellar mass growth.
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Hidden Monsters with SPHEREx I: A goldmine for heavily reddened quasars at cosmic noon
SPHEREx data confirm 77 new luminous heavily reddened quasars at 1.5<z<3.9 that are hot-dust poor relative to unobscured quasars, supporting a blow-out feedback phase.
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Optical Appearance of Scalarized Kerr-Newman Black Holes with Multiple Light Rings
Scalarized Kerr-Newman black holes develop an inner photon shell that produces an additional critical curve and distinct crescent-like higher-order images unlike those in Kerr spacetime.
-
The NANOGrav 15 yr Data Set: Targeted Searches for Supermassive Black Hole Binaries
Targeted PTA searches for CWs from 114 AGN in NANOGrav 15 yr data yield no detections, factor-of-two tighter limits than all-sky searches, and updated constraints ruling out part of the parameter space for a binary in 3C 66B.
-
ShardTensor: Domain Parallelism for Scientific Machine Learning
ShardTensor is a domain-parallelism system for SciML that enables flexible scaling of extreme-resolution spatial datasets by removing the constraint of batch size one per device.
-
Optical Variability Structure Function of Low-Luminosity AGN using ATLAS Lightcurves
Low-luminosity AGN exhibit optical variability structure function slopes that increase with black hole mass from ~0.1 to ~0.3, with amplitude anticorrelated with luminosity, no breaks observed, and variability continuing to rise on 20-year timescales.
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On the Quantisation of Linear Gauge Theories on Lorentzian Manifolds: Maxwell's Theory via Complete Gauge Fixing
A new complete gauge fixing at initial data via Hodge decomposition on complete Riemannian manifolds enables existence proofs for Hadamard states in the quantization of Maxwell theory on globally hyperbolic Lorentzian manifolds.
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Spin-($0$, $1$, $\frac{1}{2}$) Field Perturbations, Quasinormal Modes, Overtones, Greybody Factors and Strong Cosmic Censorship of Einstein-Skyrme Black Holes
Quasinormal modes for three spin fields on Einstein-Skyrme AdS black holes exhibit a mild overtone anomaly and confirm strong cosmic censorship with Christodoulou parameter β much smaller than 1/2.
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Eclipses of Nearby Radio-Loud Galactic Nuclei by Stars in Nuclear Star Clusters
Evolved stars with radii ≳500 R_⊙ in nuclear star clusters can eclipse mm radio cores of nearby radio-loud AGN with ~10% relative depth, recurrence times ≳10 years, and durations ~10 days, enabling inference of SMBH masses and NSC composition.
-
Jet-driven shocks and turbulence in radio-loud Active Galactic Nuclei observed with JWST MIRI/MRS
JWST spectroscopy reveals radio jets in nearby AGN drive multiphase ISM turbulence and shock-dominated H2 excitation both along and perpendicular to the jet direction.
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Orbital Nodal Phase as a Pipeline Invariant in Black Hole Timing
The orbital nodal phase Δψ_orb equals the nodal precession per orbit and serves as a pipeline-invariant baseline for Kerr black hole timing in the thin-ring limit.
-
Quasinormal Modes and Neutrino Energy Deposition for a Magnetically Charged Black Hole in a Hernquist Dark Matter Halo
Computations for a new black hole metric with magnetic charge and Hernquist halo show that charge raises QNM frequencies while the halo lowers them, with similar opposing effects on shadow size and neutrino annihilation efficiency.
-
Chaotic dynamics of charged particles near weakly magnetized black holes in Einstein-ModMax Theory
Numerical simulations show Shannon entropy and MIPP indicators distinguish chaotic from regular orbits of charged particles near weakly magnetized black holes in Einstein-ModMax theory, with parameters restricted by EHT shadow observations.
-
Formation of shell-crossing singularities in effective gravitational collapse models with bounded and unbounded polymerizations
Bounded polymerization in asymmetric LQG-inspired bounce models makes shell-crossing singularities unavoidable for inhomogeneous dust collapse, whereas unbounded polymerization in non-bouncing models permits avoidance for suitable decreasing initial profiles.
-
Scattering of massive particles from black holes and naked singularities
Numerical geodesics show narrow deflection angles for massive particle scattering off RN black holes versus isotropic scattering off naked singularities.
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Stability analysis of geodesics in dynamical Chern-Simons black holes: a geometrical perspective
Applies KCC theory for Jacobi stability analysis of geodesics in dynamical Chern-Simons rotating black holes and compares advantages versus Lyapunov stability.
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Photon regions, shadow observables and constraints from M87* of a Kerr-Newman-like black hole in Bumblebee gravity surrounded by plasma
The shadow of a Kerr-Newman-like black hole in Bumblebee gravity with plasma is analyzed via observables and constrained by M87* EHT data, with spin and Lorentz violation mainly distorting the shape while charge and plasma shrink the size.
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Gravitational emissions and light curves of quasi-periodic orbits in Schwarzschild spacetime embedded in a Dehnen-type dark matter halo
Dark matter halo parameters amplify the scale of closed timelike orbits in Schwarzschild spacetime, inducing phase lags in gravitational waves while light curves retain distinguishable peaks for certain orbital features.
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Distinguish Bardeen-like black holes by Gravitational lensing
Bardeen-like black holes produce ℓ-dependent corrections to weak-field deflection and strong-field lensing observables that remain consistent with observations but may distinguish them from Schwarzschild black holes.
-
$\texttt{GPUmonty}$: A GPU-accelerated relativistic Monte Carlo radiative transfer code
GPUmonty delivers a 12x speedup over grmonty by parallelizing superphoton operations on GPUs while keeping errors below 1% in tests against analytic solutions and prior codes.
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Stochastic Quantum Mechanics Trajectories Near Schwarzschild Horizon Black Holes
Stochastic trajectories near Schwarzschild horizons are shaped by gravitational fluctuations, producing different behaviors depending on angular momentum, particle frequency, and integration time.
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Reconstructing slow-roll Scalar-Tensor Gauss-Bonnet single field inflation from running spectral data
Derives slow-roll observables and consistency relations for scalar-tensor Gauss-Bonnet inflation and fits a specific model to Planck data.
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On-axis scattering of scalar fields by charged rotating black holes
Numerical on-axis scalar scattering cross sections by Kerr-Newman black holes match classical and semiclassical results.
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Transonic accretion and the analogue gravity in multi-component elliptical galaxies hosting pseudo-Schwarzschild black holes
Multi-component galactic potentials strongly shift critical points, shock parameters, and acoustic surface gravity in transonic accretion flows around non-rotating pseudo-Schwarzschild black holes under the vertical equilibrium model.
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EHT-Constrained Analysis of Shadow Deformation in Quantum-Improved Rotating Non-Singular Magnetic Monopole
Increasing the asymptotic safety parameter and spin shrinks the shadow size while increasing its distortion for a rotating Bardeen black hole, with monopole charge shaping the profile and energy emission rates also computed.
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The Dyson Minds 2025 Workshop: SETI around Black Holes
A workshop report recommends anomaly detection on existing telescope data to search for technosignatures from advanced minds powered by supermassive black holes.
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Millimeter-wave Monitoring of Active Galactic Nuclei with the Africa Millimetre Telescope
Review of the scientific scope of the Africa Millimetre Telescope for mm-wave monitoring of active galactic nuclei.
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Massive black holes and their galaxies
A review summarizing detection methods, population statistics, and coevolution of supermassive black holes with host galaxies from early universe observations and simulations.
- QPOs from the Viscous Transonic Accretion Flow Around a Spinning Black Hole
- Circular polarization images of Sgr A* for different magnetic field geometries