Transiently accelerating cosmological model with Gong-Zhang parametrization in f(T) teleparallel gravityWe present the cosmic expansion scenario in the framework of f(T) gravity by employing a dark energy equation of state (EoS) parameter. Specifically, we proceed with the power-law form of the…Khomesh R. Patle, G. P. Singh·Apr 18, 2026SaveLearn
A note on complete gauge-fixing and the constraint algebraThe admissibility of a gauge-fixing is governed by the invertibility of Δ=\σa,γb\ where σa are gauge-fixing conditions and γb are independent first-class constraints. We prove, via the…Ganga Singh Manchanda·Apr 18, 2026SaveLearn
Reference-renormalized curvature-primitive Gauss-Bonnet formalism for finite-distance weak gravitational lensing in static spherical spacetimesWe develop a reference-renormalized (photon-sphere-free) normalization scheme for Gauss-Bonnet gravitational lensing at finite distance in static, spherically symmetric spacetimes. The method treats…Reggie C. Pantig, Ali Övgün·Apr 18, 2026SaveLearn
Memory of Robinson-Trautman wavesThe memory effect for Robinson-Trautman waves is explicitly worked out. In a first step, we construct the combined frame rotation and coordinate transformation in which Robinson-Trautman waves are…Glenn Barnich, Ali Seraj·Apr 17, 2026SaveLearn
Measuring the rate of glitches in interferometric gravitational wave detectors with a hierarchical Bayesian modelGround-based gravitational wave detectors are now routinely surveying the dark Universe, finding hundreds of collisions between compact objects. However, terrestrial non-Gaussian noise artefacts,…Gregory Ashton, Colm Talbot, Andrew Lundgren et al.·Apr 17, 2026SaveLearn
Shadow, Quasinormal Modes, Sparsity, and Energy Emission Rate of Euler-Heisenberg Black Hole Surrounded by Perfect Fluid Dark MatterIn this work, we investigate the optical, dynamical, and radiative properties of an Euler--Heisenberg black hole immersed in a perfect fluid dark matter (PFDM) background. We analyze the photon…Edilberto O. Silva, Faizuddin Ahmed·Apr 17, 2026SaveLearn
Photon rings and shadows of black holes with non-minimal couplings between curvature and electromagnetic fieldWe investigate black holes with non-minimal couplings between the electromagnetic field and spacetime curvature, focusing on their event horizons, shadows, and photon rings. Such couplings can…Zhixiang Yin, Changjun Gao, Yun-Long Zhang·Apr 17, 2026SaveLearn
Frame invariant diffusive formulation of scalar-tensor gravityThermodynamics provides a useful interpretation of scalar-tensor gravity, in which the effective imperfect fluid admitted by the nonminimal coupling features a temperature that is associated with the…Laur Järv, Sotirios Karamitsos·Apr 17, 2026SaveLearn
The double Schwarzschild solution in bispherical coordinatesThe double Schwarzschild solution in the equal mass case is studied in bispherical coordinates. An explicit conformal transformation from cylindrical Weyl coordinates to bispherical coordinates is…Christian Klein, El Mehdi Zejly·Apr 17, 2026SaveLearn
Viable Cosmological Solutions from Hybrid PotentialsWe study flat Friedmann-Lema\ıtre-Robertson-Walker (FLRW) models with a perfect fluid matter source and a scalar field minimally coupled to matter with power-law-exponential …Koralia Tzanni, John Miritzis·Apr 17, 2026SaveLearn
Mechanical Long Baseline Differential Gradiometers as Low Frequency Gravitational Wave DetectorsWe present a new differential mechanical gradiometer for the detection of low-frequency Gravitational Waves. The frequency range is 0.05 to 1 Hz, a frequency gap not covered either by future…Enrico Calloni, Annalisa Allocca, Antonino Chiummo et al.·Apr 17, 2026SaveLearn
A Semilinear Wave Sector in Force-Free ElectrodynamicsWe introduce an ansatz for force-free electrodynamics in Minkowski spacetime under which the nonlinear system reduces to a semilinear scalar wave equation depending on two spacetime variables. This…Yafet E. Sanchez Sanchez·Apr 17, 2026SaveLearn
Two types of quasinormal modes of Casadio-Fabbri-Mazzacurati brane-world black holesUsing the convergent Leaver method, we investigate the quasinormal modes of a massive scalar field propagating in the background of the Casadio--Fabbri--Mazzacurati (CFM) brane-world black hole. We…Bekir Can Lütfüoğlu, Sardor Murodov, Mardon Abdullaev et al.·Apr 17, 2026SaveLearn
The equation of Binet in classical and relativistic orbital mechanicsBinet's equation provides a direct way to obtain the geometric shape of orbits in a central force field. It is well known that in Newtonian gravitation Binet's equation leads to all the conic…Jose Luis Alvarez-Perez·Apr 17, 2026SaveLearn
Inferring neutron-star Love-Q relations from gravitational waves in the hierarchical Bayesian frameworkDespite the large uncertainties in the equation of state for neutron stars (NSs), a tight universal ``Love-Q'' relation exists between their dimensionless tidal deformability, Λ, and the…Zhihao Zheng, Ziming Wang, Jinwen Deng et al.·Apr 17, 2026SaveLearn
Boson star-black hole binaries: initial data and head-on collisionsWe present a numerical-relativity study of comparable-mass boson star-black hole (BS-BH) head-on collisions, focusing on both initial-data construction and gravitational-wave (GW) phenomenology. We…Zhuan Ning·Apr 16, 2026SaveLearn
A First-Order Eikonal Framework for Quasinormal Modes, Shadows, Strong Lensing, and Grey-Body Factors in a Scalarized Black-Hole MetricWe construct an analytic geodesic-optics description of quasinormal ringing, black-hole shadows, strong lensing, and grey-body factors for the static spherical metric introduced in [Bakopoulos, et.…Bekir Can Lütfüoğlu, Javlon Rayimbaev, Sardor Murodov et al.·Apr 16, 2026SaveLearn
Probing bulk geometry via pole skipping: from static to rotating spacetimesWe investigate an analytical framework for reconstructing bulk geometries from pole-skipping data. Previously, this method enabled the recursive recovery of near-horizon metric derivatives in static,…Cheng Ran, Zhenkang Lu, Shao-Feng Wu·Apr 16, 2026SaveLearn
Hamiltonian formulation of a gravity model from (A)dS Yang-Mills theoryWe study the Hamiltonian formulation of a gravity model obtained from a Yang--Mills theory for a one-parameter family of (A)dS Lie algebras parametrized by α, when the family of algebras is…Goffredo Chirco, Alfonso Lamberti, Patrizia Vitale·Apr 16, 2026SaveLearn
Highly eccentric non-spinning binary black hole mergers: quadrupolar post-merger waveformsWe present numerically-informed closed-form expressions for the dominant (,m)=(2,2) waveform harmonic of the post-merger emission from mergers of non-spinning binary black holes with comparable…Nishkal Rao, Gregorio Carullo·Apr 16, 2026SaveLearn
Cosmological dynamics and structure formation in a generalized mass-to-horizon entropy-inspired modified gravityIn this article, our goal is to investigate the cosmological dynamics and structure formation in a modified cosmological framework inspired by a generalized mass-to-horizon entropy relation and…Subhra Mondal, Amitava Choudhuri·Apr 16, 2026SaveLearn
Taming the Aretakis instability: extremal black holes with multi-degenerate horizonsStationary black hole geometries with non-degenerate Cauchy horizons are classically unstable due to mass inflation. At extremality, mass inflation is absent, but a different dynamical instability…Shreyansh Agrawal, Panagiotis Charalambous, Laura Donnay et al.·Apr 16, 2026SaveLearn
Static Tidal Perturbations of Relativistic Stars: Corrected Center Expansion and Love Numbers-IWe revisit static tidal perturbations of relativistic stars with emphasis on two technical issues in the standard quadrupolar formulation. First, we derive the regular-center Frobenius expansion of…Emel Altas, Ercan Kilicarslan, Onur Oktay et al.·Apr 16, 2026SaveLearn
On measuring the Quantum UniverseWe present a theoretical analysis of the WDW approach to quantum cosmology extended to gravity theories with torsion. The dynamics of the FLRW universe is formulated as a classical Hamiltonian…David Vasak, Johannes Kirsch, Juergen Struckmeier·Apr 16, 2026SaveLearn
Jacobi stability of circular orbits around conformally invariant Weyl gravity black holesWeyl conformal gravity was originally proposed in the early twentieth century as an attempt to unify gravitation and electromagnetism. Since 1989, renewed interest in this fourth-order theory of…Cristina Blaga, Paul A. Blaga·Apr 16, 2026SaveLearn