Photon escape from the ISCO of a rotating black hole in Asymptotic SafetyWe study isotropic emission of photons from the innermost stable circular orbit (ISCO) of a subextremal rotating black hole (BH) in asymptotic safety (AS). We calculate both the photon escape…Miguel A. Enriquez, Luis A. Sanchez·Jul 20, 2026SaveLearn
GWTC-4.0: Tests of General Relativity. II. Parameterized TestsIn this second of three papers on tests of general relativity (GR) applied to the compact binary coalescence signals in the 4th Gravitational-Wave Transient Catalog (GWTC-4.0), we present the results…The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration et al.·Jul 20, 2026SaveLearn
Can Light Cross a Singularity? Exact Solutions from Analogue GravityUsing a simple spacetime hosting a strong curvature naked singularity, we employ an analogue gravity model to study electromagnetic fields in this background. We find exact solutions to the full set…Juan Manuel Paez, Franco Fiorini, Santiago M. Hernández·Jul 20, 2026SaveLearn
Stochastic Evolution of Primordial Black Holes to near-extremality in EFTs of GravityThe search for dark matter candidates includes primordial black holes (PBHs) as possible constituents. Recent studies show that some PBHs can survive to the present epoch by gaining angular momentum…Soham Acharya, Shuvayu Roy, Sudipta Sarkar·Jul 20, 2026SaveLearn
Tidal perturbations of an extreme mass ratio inspiral around a Kerr black holeWe determine the metric of a Kerr black hole subject to external tidal fields using metric reconstruction techniques. Working within the Newman-Penrose formalism, we solve the Teukolsky master…Marta Cocco, Gianluca Grignani, Troels Harmark et al.·Jul 20, 2026SaveLearn
Observable signature of magnetic tidal coupling in hierarchical triple systemsWe study hierarchical triple systems formed by a compact binary orbiting a supermassive black hole (SMBH), focusing on the role of relativistic magnetic tidal interactions. Extending previous…Marta Cocco, Gianluca Grignani, Troels Harmark et al.·Jul 20, 2026SaveLearn
Particle production in a bouncing universeIn massless scalar field cosmology, imposing the universe's physical volume as fundamentally discrete resolves the big bang singularity via a big bounce. We use quantum field theory on curved…Mustafa Saeed, Aiman Nauman, Irfan Javed·Jul 20, 2026SaveLearn
Geometrothermodynamics and critical behavior of regular black holesWe apply the formalism of quasi-homogeneous geometrothermodynamics to study the stability, phase transition, and criticality properties of the Bardeen regular black hole. We show that the…H. Quevedo, M. N. Quevedo, A. Sanchez·Jul 20, 2026SaveLearn
The impact of physically motivated calibration errors on search pipeline detection parameters for broadband burst SignalsImperfections in the calibration of gravitational wave observatories introduce frequency dependent amplitude and phase errors on the measured GW signal. Previous unmodelled burst searches have…Milan Wils, Brad Ratto, Jeffrey S. Kissel et al.·Jul 19, 2026SaveLearn
Gravitational wave propagation in Hořava-Lifshitz gravityWe investigate the generation and propagation of gravitational waves in the leading parity-even infrared truncation of Hořava-Lifshitz gravity, characterized by the modified tensor dispersion…A. A. Araújo Filho, J. L. A. Silva, N. Heidari et al.·Jul 19, 2026SaveLearn
Spontaneous scalarization around a black hole in a dark matter haloWe demonstrate that in a scalar-tensor theory where dark matter is conformally coupled to a scalar field, a black hole surrounded by a Hernquist dark matter halo can undergo spontaneous…M. Navid Gasemi Zad, H. Mohseni Sadjadi·Jul 19, 2026SaveLearn
Probing Primordial Cosmology Through BBN Observational Constraints Under Extended Gravitational DynamicsIn this article, We investigate the cosmological consequences of a recently developed f(R,G,T) gravitational framework, in which the action is formulated as a general function of the…Abdul Malik Sultan, Manahil Ali, Muhammad Israr Aslam et al.·Jul 19, 2026SaveLearn
Probing Nonlinear Logarithmic Kalb-Ramond Black Holes: Particle Dynamics, Epicyclic Oscillations and Thermodynamic SignaturesIn contrast to conventional linear coupling frameworks, the proposed work investigated the nonlinear effects that become more significant in the strong field regime of a black hole. We have…Aftab Ansari, Rajesh Kumar, Praveen Kumar Dhankar·Jul 19, 2026SaveLearn
Symplectic mechanics of relativistic spinning compact bodies. III. quadratic-in-spin integrability in Type-D Einstein spacetimes: persistence and breakdownWe investigate the integrability of spinning compact body dynamics at quadratic order in spin in four-dimensional Einstein spacetimes admitting a non-degenerate Killing--Yano tensor. Working within…Paul Ramond, Soichiro Isoyama, Adrien Druart·Jul 19, 2026SaveLearn
Symplectic mechanics of relativistic spinning compact bodies. I. linear-in-spin integrability under Killing-Yano symmetryWe study the Hamiltonian dynamics of a neutral, massive spinning test body at linear order in spin, as governed by the Mathisson--Papapetrou--Tulczyjew--Dixon equations in a 4-dimensional spacetime…Paul Ramond, Soichiro Isoyama·Jul 19, 2026SaveLearn
Analytical Study of Deflection Angle and Time Delay in Kerr Spacetime with Modified PropagationWe investigate gravitational lensing in Kerr spacetime in the presence of a modified photon propagation law arising from higher-curvature effective field theory corrections. Adopting a deformed…Takamasa Kanai·Jul 18, 2026SaveLearn
Asymptotic analysis of varying light speed cosmologiesWe investigate potential singularities in isotropic cosmological models featuring a time-varying speed of light and the gravitational constant. The governing field equations generally simplify into…Dimitrios Trachilis·Jul 18, 2026SaveLearn
Regular Black Hole Formation and Gamma-Ray Burst from Matter ConversionDuring the gravitational collapse of a massive star into a regular black hole, a new form of matter must be produced in order to prevent the formation of a central singularity. Since such matter is…Vitalii Vertogradov, Zhanna Kuznetsova, Yu Shi·Jul 18, 2026SaveLearn
Separating the linearized Einstein equations in KerrA direct separation of the linearized Einstein equations in Kerr is presented. The trace of the perturbed metric is found to obey the spin-0 perturbation equation and so is irrelevant for the spin-2…Jianwei Mei·Jul 18, 2026SaveLearn
Thin-Shell Wormholes from Entropy-Induced Black-Hole GeometriesModified black-hole entropies can induce effective spacetime geometries and thereby provide a thermodynamic route for investigating thin-shell wormholes. In this work, we construct symmetric…Jonathan A. Rebouças, Edson Otoniel·Jul 18, 2026SaveLearn
Hawking Emission from Black Holes Evaporating toward Wormholes and the Accuracy of the WKB ApproximationWe revisit Hawking radiation from two black-hole families that can approach macroscopic wormhole configurations: the Simpson--Visser black-bounce geometry and the Casadio--Fabbri--Mazzacurati…Bekir Can Lütfüoğlu·Jul 18, 2026SaveLearn
Generalized Entropies and Black Hole Area Quantization from Landauer's PrincipleWe investigate black hole area quantization by imposing Landauer's principle on the discrete entropy change between consecutive area levels. The elementary transition is identified with the…Jorge Ananias Neto, Ronaldo Thibes·Jul 18, 2026SaveLearn
Electromagnetic wave propagation in static black hole spacetimes: an effective refractive index description in Schwarzschild geometryWe investigate electromagnetic wave propagation in static, spherically symmetric black hole spacetimes using a covariant and gauge-invariant framework based on the established Maxwell perturbation…Abdullah Guvendi, Omar Mustafa Semra Gurtas Dogan, Hassan Hassanabadi·Jul 18, 2026SaveLearn
Periodic Gravitational Lensing with Oscillating Boson StarsWe show that oscillating (real-scalar) boson stars generically host an oscillating radial caustic. Sources near this caustic cross it every half period, thereby producing periodic…Xing-Yu Yang, Tan Chen, Rong-Gen Cai·Jul 18, 2026SaveLearn
Biases in Tests of General Relativity from Microlensed Gravitational-Wave SignalsGravitational-wave (GW) observations of compact binary mergers enable precision tests of general relativity (GR) in the strong-field regime, but their reliability depends on accurate waveform…Anirban Kopty, Apratim Ganguly, N. V. Krishnendu et al.·Jul 17, 2026SaveLearn