Pulsar timing in the Galactic CenterWe propose a novel approach which implements the relativistic calculations of the photon travel time into a robust timing model for pulsars orbiting supermassive black holes. We demonstrate that…Riccardo Della Monica, Ivan de Martino·May 26, 2026SaveLearn
Spatial Qubit Entanglement Witness for Quantum Natured GravityEvidencing the quantum nature of gravity through the entanglement of two masses has recently been proposed. Proposals using qubits to witness this entanglement can afford to bring two masses close…Bin Yi, Urbasi Sinha, Dipankar Home et al.·May 26, 2026SaveLearn
A Treatise on Differential Geometry and its role in Relativity TheoryThis lecture note is hopefully helpful to undergraduate and postgraduate students or beginning Ph.D students both in theoretical physics and in applied mathematics. Modern terminology in differential…Subenoy Chakraborty·May 26, 2026SaveLearn
Universe in a black hole in Einstein-Cartan gravityThe conservation law for the angular momentum in curved spacetime, consistent with relativistic quantum mechanics, requires that the antisymmetric part of the affine connection (torsion tensor) is a…Nikodem Popławski·May 26, 2026SaveLearn
Spacetime triple wormholeWe describe a multi-neck spacetime wormhole with a simple metric tensor and a simple injective map without coordinate patching. An intra-universe, non-thin-shell, non-spherically-symmetric 3-neck…Vincent Herr, Aimé Fournier, Andrew J. S Hamilton·May 25, 2026SaveLearn
Equilibrium Gibbs Bifurcations of Bardeen-AdS Black Holes at Fixed PressureIn the direct horizon convention, the fixed-pressure Gibbs curve of the four-dimensional Bardeen-AdS black hole passes through an intermediate sequence between the Reissner-Nordstrom-AdS swallow-tail…J. -K. Wang·May 25, 2026SaveLearn
Equatorial Circular Motion of Charged Test Particles in a Weakly Magnetized Taub--NUT BackgroundWe study circular motion of charged test particles on the equatorial slice of a Taub--NUT black hole with Manko--Ruiz parameter C, immersed in a weak external magnetic field introduced via…B. J. Bansawang, Tasrief Surungan·May 25, 2026SaveLearn
Thermodynamics and quasinormal modes of the regular Dymnikova-Letelier black holeIn this work, we investigate the thermodynamic properties and quasinormal modes of a regular Dymnikova-Letelier black hole. Starting from the Einstein field equations sourced by an effective…L. C. N. Santos, L. G. Barbosa·May 25, 2026SaveLearn
Energy extraction from NED-deformed rotating black holes via the Comisso-Asenjo reconnection processWe study rotating black holes in general relativity coupled to nonlinear electrodynamics (NED), focusing on an axisymmetric solution with deformation parameter g. On the spherical seed, weak-field…Marco Figliolia, Gaetano Lambiase, Ali Övgün et al.·May 25, 2026SaveLearn
Holographic Thermodynamic Signatures of Simpson--Visser--AdS Black HolesWe study a Simpson--Visser regularization of the four-dimensional Schwarzschild--anti--de\,Sitter (SV--AdS) black hole, treated as the bulk dual of a planar conformal field theory (CFT) on the AdS…Saeed Noori Gashti, Behnam Pourhassan, Izzet Sakalli·May 25, 2026SaveLearn
Donutization Inside Neutron Stars: Shell-Localized Scalar FieldsHeavy scalar fields (mϕ10-9 eV) in scalar-tensor gravity are expected to be hidden from neutron-star observations because their Compton wavelength is sub-stellar. We show that neutron…Hao-Jui Kuan, Alan Tsz-Lok Lam, Jacquelyn Noronha-Hostler et al.·May 25, 2026SaveLearn
Trade-off Relation for Black Hole Entropy FluctuationsBlack holes respond to infalling quantum matter fields by changing their entropy. Since such matter is quantum in nature, the entropy response should be sensitive to its quantum fluctuations. We…Kensuke Gallock-Yoshimura, Yoshihiko Hasegawa·May 25, 2026SaveLearn
Black string immersed in perfect fluid dark matterWe present an exact four-dimensional black string solution immersed in perfect fluid dark matter within an anti-de Sitter background. By solving the Einstein field equations for an anisotropic fluid,…L. G. Barbosa, L. C. N. Santos·May 25, 2026SaveLearn
Covariant Dynamical Systems Formulation of the Tolman-Oppenheimer-Volkoff EquationsWe revisit static, spherically symmetric perfect-fluid stellar models in General Relativity within the framework of the 1+1+2 semi-tetrad formalism. For locally rotationally symmetric static…Eduardo Bittencourt, Mariam Campbell, Peter K. S. Dunsby et al.·May 25, 2026SaveLearn
Hyperboloidal evolution for scalar scattering in Minkowski spaceWe develop a time-domain numerical framework for global scalar wave scattering in Minkowski spacetime. The main contribution is an exact conformal matching of three compactified regions: a past…Ekrem S Demirboğa, Anıl Zenginoğlu·May 25, 2026SaveLearn
Gravitational wave interactions with matter: beyond quadrupolar perturbationsPrevious work has developed the theory of linearized gravitational wave (GW) interactions with matter using the Bondi-Sachs formalism, but with the perturbations restricted to be quadrupolar, i.e.,…Ulrich K. Beckering Vinckers, Nigel T. Bishop·May 25, 2026SaveLearn
Generalising gravitationally induced decoherence beyond linear environmental interactions in a microscopic quantum mechanical toy modelWe generalise the quantum mechanical toy model for gravitationally induced decoherence presented in Xu, Blencowe (2022) and Domi et al. (2024). In contrast to earlier formulations, in which the…Max Joseph Fahn, Renata Ferrero, Kristina Giesel et al.·May 25, 2026SaveLearn
Polarized Anisotropic Stochastic Gravitational Wave Background Search with Ground-Based Detector NetworksGravitational waves admit a Stokes decomposition into intensity (I), circular polarization (V), and linear polarization (Q, U), analogous to Cosmic Microwave Background (CMB) polarimetry. We…Töre Boybeyi, Vuk Mandic·May 25, 2026SaveLearn
Electromagnetic emission from a black-to-white hole transition -- Photospheric emissionWe calculate the gamma ray emission from a black-to-white hole transition. We put forward a model for the prompt emission phase, based on the photospheric emission model with the underlying idea that…Mattia Villani·May 25, 2026SaveLearn
Cesàro convergence of the high-order WKB method and its applications to black-hole overtones and long-lived modesWe develop a fully automatic Mathematica implementation of the black-hole WKB method at very high orders based on the Bender-Wu algorithm, which in principle is limited only by memory and…Roman A. Konoplya, Jerzy Matyjasek, Alexander Zhidenko·May 25, 2026SaveLearn
Onset of spontaneous scalarization in dark matter starsWe investigated the onset of spontaneous scalarization in dark matter stars. In scalar-tensor theories, the coupling between matter and a scalar field generates an effective mass, which is known to…Junya Tanaka·May 25, 2026SaveLearn
Periodic orbits and gravitational waveforms around a Schwarzschild black hole with a cloud of strings embedded in perfect fluid dark matterIn this study, we explore the dynamics of particle orbits and their corresponding gravitational wave signatures in the vicinity of a Schwarzschild black hole (BH) surrounded by a cloud of strings and…Ziqiang Cai, Zhi Li, Zhenglong Ban et al.·May 25, 2026SaveLearn
A pre-merger-informed spectral-level ringdown inference framework for black-hole spectroscopyBlack-hole spectroscopy aims to infer properties of the remnant spacetime from the quasinormal-mode (QNM) spectrum of the gravitational-wave ringdown signal. In most implementations, however, this…Shitong Guo, Yan-Gang Miao·May 25, 2026SaveLearn
Gravitational Wave Propagation in K-essence Cosmology: Theory and Observational ConstraintsGravitational waves (GWs) provide a powerful, theory-independent probe of the dynamical structure of spacetime and the cosmological background. We study linearized GW propagation in k-essence…Sougata Bhunia, Eduardo Guendelman, Debashis Gangopadhyay et al.·May 25, 2026SaveLearn
Photon Sphere and Shadow of a Perturbative Black Hole in f(R,G) GravityWe investigate the impact of higher-curvature corrections on black-hole observables within a perturbative f(R, G) gravity framework. Working in a static, spherically symmetric spacetime, we…G. G. L. Nashed·May 25, 2026SaveLearn