Microstate Counting for rotating (type~II) isolated horizonsWe present a proposal for black hole microstate counting in Loop Quantum Gravity (LQG) for rotating (type~II) isolated horizons. The key obstacle in extending the standard nonrotating entropy…Pritam Nanda·Mar 20, 2026SaveLearn
Exact pp-wave solutions in shift-symmetric higher-order scalar-tensor theoriesWe investigate exact plane-fronted gravitational wave (pp-wave) solutions within the framework of shift-symmetric quadratic-order higher-order scalar--tensor (HOST) theories. These solutions…Masato Minamitsuji·Mar 19, 2026SaveLearn
Quasinormal Modes and Grey-Body Factors of Scalar, Electromagnetic and Dirac Fields Around Einasto-Supported Regular Black HolesWe study quasinormal modes and grey-body factors of scalar, electromagnetic and Dirac test fields for a black hole surrounded by matter distributed according to the Einasto density profile. The…S. V. Bolokhov·Mar 19, 2026SaveLearn
Observational imprints and quasi-Periodic oscillations of magnetically charged anti-de Sitter black holesIn this work, we investigate observable signatures of a magnetically charged Anti-de Sitter black hole in string-inspired Euler-Heisenberg theory. We analyze photon trajectories, the photon sphere,…Faizuddin Ahmed, Mohsen Fathi, Ahmad Al-Badawi·Mar 19, 2026SaveLearn
Ringdown modeling for effective-one-body waveforms in the test-mass limit for eccentric equatorial orbits around a Kerr black holeWe study the plunge and merger of a non-spinning particle falling into a Kerr black hole following an eccentric planar inspiral. The dynamics is driven by an effective-one-body radiation reaction,…Simone Albanesi, Sebastiano Bernuzzi, Alessandro Nagar·Mar 19, 2026SaveLearn
Cosmology and modified GW propagation from the BNS mass function at third-generation detector networksWe perform forecasts for the Hubble parameter H0 and for the parameter Xi0 that describes modified gravitational-wave propagation, using information from the binary neutron star (BNS) mass…Dounia Nanadoumgar-Lacroze, Niccolò Muttoni, Michele Maggiore et al.·Mar 19, 2026SaveLearn
Recursive Penrose processes in electrically charged black hole spacetimes: Backreaction and energy extractionWe study a recursive Penrose process and the energy extraction for the decay of electrically charged particles in a Reissner-Nordström black hole spacetime with anti-de Sitter (AdS) asymptotics,…Duarte Feiteira, José P. S. Lemos, Oleg B. Zaslavskii·Mar 19, 2026SaveLearn
Black hole superradiance in Poincaré gauge theoryWe investigate the phenomenon of black hole superradiance in the presence of torsion within the framework of Poincaré gauge theory. In particular, in contrast to the classical approach of General…Sebastian Bahamonde, Jorge Gigante Valcarcel·Mar 19, 2026SaveLearn
Thermodynamic Analysis of Charged AdS Black Holes with Cloud of Strings in Einstein-Bumblebee Gravity via Tsallis EntropyWe investigate the thermodynamic properties of charged anti-de Sitter black holes surrounded by a cloud of strings in bumblebee gravity. In this framework, the cloud-of-strings parameter α and the…Faizuddin Ahmed, Edilberto O. Silva·Mar 19, 2026SaveLearn
GWTC-4.0: Tests of General Relativity. III. Tests of the RemnantsThis is the third paper of the set recording the results of the suite of tests of general relativity (GR) performed on the signals from the fourth Gravitational-Wave Transient Catalog (GWTC-4.0),…The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration et al.·Mar 19, 2026SaveLearn
GWTC-4.0: Tests of General Relativity. I. Overview and General TestsThe worldwide LIGO-Virgo-KAGRA network of gravitational-wave (GW) detectors continues to increase in sensitivity, thus increasing the quantity and quality of the detected GW signals from compact…The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration et al.·Mar 19, 2026SaveLearn
Revisiting f(T) Teleparallel Gravity with a Parametrized Hubble Parameter and Observational ConstraintsIn this paper, the dynamical behavior of the accelerated expansion of the universe is studied within the framework of f(T) gravity by considering a well-motivated functional form of f(T). A…Khomesh R. Patle, G. P. Singh·Mar 19, 2026SaveLearn
Analytic Expressions for Quasinormal Modes of a Regular Black Hole Sourced by a Dehnen-Type HaloUsing an expansion beyond the eikonal regime, we derive relatively compact and accurate analytic expressions for the gravitational quasinormal modes of an asymptotically flat black hole supported by…Zainab Malik·Mar 19, 2026SaveLearn
Scalarization of charged Taub-NUT black hole and the entropy boundWe investigate the spontaneous scalarization of charged Taub-NUT black holes within the framework of Einstein-Maxwell-scalar-Gauss-Bonnet gravity. By selecting a suitable coupling function, the…Lei Zhang, Hai-Shan Liu·Mar 19, 2026SaveLearn
Observational Signatures of Exact Black Hole Solutions in a Dark Matter HaloIn this work, we derive novel exact solutions describing Schwarzschild-like black holes (BHs) embedded in a Dehnen-type dark matter (DM) halo density profile and investigate their geometric,…Azalbek Boltaev, Tursunali Xamidov, Sanjar Shaymatov·Mar 18, 2026SaveLearn
Non-linear instability of the Kerr Cauchy horizon near i+We consider solutions of the Einstein vacuum equations which arise from smooth initial data on a hypersurface slightly inside a dynamical black hole settling down to a subextremal Kerr black hole,…Sebastian Gurriaran·Mar 18, 2026SaveLearn
Non-Schwarzschild black holes sourced by scalar-vector fieldsIn this work, we construct a static and spherically symmetric black hole solution sourced by a nonlinear scalar-vector sector within the framework of the Minimal Geometric Deformation (MGD) approach.…Manuel Gonzalez-Espinoza, Y. Gómez-Leyton, Z. Stuchlik et al.·Mar 18, 2026SaveLearn
Contrasting behaviour of two spherically symmetric perfect fluids near a weak null singularity in a spherically symmetric black holeIn this work we contrast the behaviour of two spherically symmetric matter models in a class of spherically symmetric spacetimes which feature a weak null singularity. This class in particular…Raya V. Mancheva·Mar 18, 2026SaveLearn
Holographic Quantum Foam: Theoretical Underpinnings and Observational EvidenceSpacetime is foamy due to quantum fluctuations. Various gedanken experiments show that distances fluctuate by amounts consistent with the holographic principle, hence the name "holographic…Eric Steinbring, Y. Jack Ng·Mar 18, 2026SaveLearn
Tetrads in SU(N) Yang-Mills geometrodynamicsThe discovery of the SU(3) symmetry was fundamental as to establishing an ordering principle in particle physics. We already studied how to couple the SU(3) symmetry to the gravitational field in…Alcides Garat·Mar 18, 2026SaveLearn
On the concept of simultaneity in relativityIn this comment, we demonstrate that the claim by Spavieri et al., asserting that Wang et al.'s interferometric experiment disproves the special theory of relativity by revealing that…Justo Pastor Lambare·Mar 18, 2026SaveLearn
More on near-horizon charges black holes with gravitational hair in three dimensionsWith the aim of continuing the exploration of near-horizon charges in higher-curvature gravity, searching for sectors leading to universal behaviors, we first provide a thorough revision and formulae…Seyed Naseh Sajadi, Supakchai Ponglertsakul, Julio Oliva·Mar 18, 2026SaveLearn
Energy extraction from a rotating Buchdahl star via magnetic reconnectionIn this work, we investigate the magnetic reconnection (MR) process as a mechanism for energy extraction from a rapidly rotating Buchdahl star (BS), one of the most compact horizonless objects that…Ikhtiyor Eshtursunov, Sanjar Shaymatov·Mar 18, 2026SaveLearn
Electromagnetic radiation-reaction near black holes: orbital widening and the role of the tailWe investigate the orbital evolution of a classical charged particle around a Schwarzschild black hole immersed in an external, uniform magnetic field, taking into full account both local…Bakhtinur Juraev, Arman Tursunov, Zdeněk Stuchlík et al.·Mar 18, 2026SaveLearn
Scattering of a scalar field in the four-dimensional quasi-topological gravityWe study grey-body factors for a massless scalar field in the spacetime of regular black holes arising in four-dimensional non-polynomial quasi-topological gravity. We consider two representative…Alexey Dubinsky·Mar 18, 2026SaveLearn