Extracting Energy from a Non-Kerr Rotating Spacetime with an Anomalous Quadrupole Moment via Magnetic ReconnectionThis paper investigates how to extract energy from a non-Kerr rotating spacetime with an anomalous quadrupole moment via the magnetic reconnection mechanism. Unlike many other rotating spacetimes,…Ke Wang, Xiao-Xiong Zeng·Jul 28, 2026SaveLearn
Parametrized beyond-Teukolsky framework in the time domainModifications to General Relativity can significantly alter the perturbative response of black holes, leaving imprints on quasinormal-mode spectra, waveform amplitudes and phases, and late-time…Ciro De Simone, Sebastian H. Völkel, Kostas D. Kokkotas et al.·Jul 28, 2026SaveLearn
GSpyNetTree-O4: an event validation tool used in the fourth LIGO-Virgo-KAGRA observing runThe frequent presence of non-Gaussian transient noise, or glitches, in gravitational-wave detector data can affect gravitational-wave searches, parameter estimation, and downstream analyses. To…Sofia Alvarez-Lopez, Man Leong Chan, Franz S. Herbst et al.·Jul 28, 2026SaveLearn
Upwind embedded boundary SBP operators: New high order numerical schemes for arbitrarily shaped domains with Cartesian gridsEmbedded boundary summation by parts (SBP) methods define finite differencing based derivative operators with the added feature that the boundary need not coincide with a grid cell, allowing a…Conner Dailey·Jul 28, 2026SaveLearn
Dark matter environments and safeguards for spacetime inference from horizon scale interferometryHorizon scale interferometry can test a black hole spacetime only when the data, source model, and numerical response are reliable. We study this requirement with the public 2017 M87* closure data, a…Mohsen Fathi·Jul 28, 2026SaveLearn
Gravitational perturbations of a regular T-duality inspired black hole: Quasinormal modes, excitation factors, and time-domain evolutionWe study axial gravitational perturbations of the neutral regular black hole generated by a non-local, T-duality-inspired zero-point length and the associated gravitational self-energy. In this…Bekir Can Lütfüoğlu, Mardon Abdullaev, Javlon Rayimbaev et al.·Jul 28, 2026SaveLearn
Curvature-induced scalarization of charged AdS black holesWe investigate how a negative cosmological constant affects the Gauss-Bonnet (GB) scalarization in the Einstein-Maxwell-scalar-Gauss-Bonnet theory with a scalar coupling constant η to GB term. We…Chao-Ming Zhang, Yun Soo Myung, Lina Zhang et al.·Jul 28, 2026SaveLearn
Stationary solutions in the small-c expansion of GRWe study the small-c expansion of general relativity in ADM variables up to next-to-next-to-leading order (NNLO). We show that, in the stationary sector, this formulation renders the field…Enes Bal, Ertuğrul Ekiz, Emre Onur Kahya et al.·Jul 28, 2026SaveLearn
Hawking area law in quantum gravityWe show that the LIGO--Virgo--KAGRA verification of Hawking area law carries profound consequences for quantum gravity if such a law is postulated to hold exactly. The observed mergers can be…Gianluca Calcagni·Jul 28, 2026SaveLearn
Electromagnetic, gravitational wave, and static gravitational transmission through throat spacetimes: a constraint-wave asymmetryWe compute the transmission properties of electromagnetic (EM), gravitational wave (GW), and static gravitational perturbations through geometric throats in spherically symmetric spacetimes. On the…Jeff Riley·Jul 28, 2026SaveLearn
Almost Universal MetricsA metric is called universal if every symmetric conserved rank-two tensor constructed locally from the metric, the curvature, and covariant derivatives of the curvature is proportional to the metric.…Metin Gurses, Tahsin Cagri Sisman, Bayram Tekin·Jul 28, 2026SaveLearn
Multimessenger Signatures of Tilted, Self-Gravitating, Black Hole DisksWe perform fully relativistic GRMHD simulations of magnetized, self-gravitating black hole-disk (BHD) systems in which the black hole spin is misaligned with the disk angular momentum. Massive disks…Milton Ruiz, Antonios Tsokaros, Stuart L. Shapiro·Jul 28, 2026SaveLearn
Improved constraints on modified Newtonian gravity from Cassini radio tracking dataWe report an updated constraint on the Solar System quadrupole parameter Q2, which encodes the external field effect predicted by modified gravity versions of the modified Newtonian dynamics…R. S. Park, A. Hees, B. Famaey et al.·Jul 28, 2026SaveLearn
Static stable timelike circular orbits and Aschenbach effect in horizonless solutions of Einsteinian cubic gravityIn modified gravity theories, horizonless compact objects serve as a compelling alternative to black holes for testing strong-field gravity. Einsteinian cubic gravity (ECG) provides a gravitational…Zhen-Hua Zhao, Yong-Qiang Wang·Jul 28, 2026SaveLearn
Black hole ringdown spectroscopy of curvature-coupled scalar and pseudoscalar fieldsRemnant black holes formed in compact binary coalescences provide a clean setting for probing additional fields coupled to gravity. By analyzing the ringdown signals of the loudest LIGO-Virgo-KAGRA…Adrian Ka-Wai Chung, Nicolás Yunes·Jul 28, 2026SaveLearn
Precision Joint Constraints on Cosmology and Gravity Using Strongly Lensed Gravitational Wave PopulationsWe present a Bayesian framework to jointly constrain the Hubble constant (H0) and the post-Newtonian parameter (γ), a key indicator of deviations from general relativity, using the population…Xinguang Ying, Tao Yang·Jul 28, 2026SaveLearn
Entropy production during reheating after inflation and General Relativistic Entropic AccelerationPreheating transforms the coherent, low-entropy energy of the post-inflationary inflaton condensate into a far-from-equilibrium bath of field quanta, and is therefore an intrinsically irreversible…Juan Garcia-Bellido·Jul 27, 2026SaveLearn
Observationally Reconstructed Spacetime of NGC 5907: Dark-Matter-Corrected Black Hole Thermodynamics and Galactic ShadowWe present an observationally guided relativistic framework to investigate the thermodynamic and optical properties of a black hole in the NGC 5907 galaxy. By reconstructing the spacetime directly…Aritra Sanyal Farook Rahaman·Jul 27, 2026SaveLearn
Phantom-Divide Crossing in Barrow-Tsallis Holographic Dark Energy with a Scale-Dependent Barrow ExponentWe consider a spatially flat cosmological model containing a noninteracting barotropic fluid and holographic dark energy with the future event horizon as the infrared cutoff. We parametrize the…D. A. Yerokhin·Jul 27, 2026SaveLearn
Dark Matter Deficient Galaxies as Probes of Dark MatterDark matter deficient galaxies provide a direct way to test whether baryons and dark matter can become sufficiently separated during galaxy evolution. We formulate a Dark Matter-Baryon Separability…Oem Trivedi, Abraham Loeb·Jul 27, 2026SaveLearn
Fixing IR tail of gravitational waves from domain wallsNumerical simulations of gravitational waves (GW) production during violent evolution of matter inhomogeneities in the early Universe yield highly wiggle infrared parts of the spectra. Obtained…Ivan Dankovsky, Dmitry Gorbunov·Jul 27, 2026SaveLearn
Coupled Gravitoelectromagnetic Response of a Magnetically Supported Generalized Hayward Black Hole in Nonlinear ElectrodynamicsWe construct the exterior coupled gravitational and electromagnetic response of a magnetically supported generalized Hayward black hole within a specified nonlinear electrodynamic completion. Both…Anirudh Pradhan, K. Ghaderi, M. Zeyauddin et al.·Jul 27, 2026SaveLearn
Fast, accurate, and differentiable: a neural-network surrogate for NRSur7dq4 precessing binary black hole waveformsWe present a neural network surrogate model that emulates the NRSur7dq4 gravitational waveform model for precessing binary black hole mergers. The surrogate decomposes the waveform into constituent…Michael Pürrer, Ashwin Girish, Lucy M. Thomas et al.·Jul 27, 2026SaveLearn
Tidal deformation of an accreting compact objectTidal deformation of a compact object serves as a sensitive probe of the strong-gravity regime and nature of the compact object. It captures how a compact object responds to the external perturbing…Avijit Chowdhury, Chiranjeeb Singha, Kazuharu Bamba et al.·Jul 27, 2026SaveLearn
Beyond-eikonal diffraction integral in gravitational lensingWe revisit the derivation of the diffraction integral, which is an approximate evaluation of the Kirchhoff integral, widely used in the literature for phenomenological applications in gravitational…Emma Bruyère, Giulia Cusin, Cyril Pitrou·Jul 27, 2026SaveLearn