On correlated noise in the LIGO-Virgo network: a test of the stochastic gravitational-wave background hypothesisWe revisit the inter-detector cross-correlation criterion used in gravitational-wave validation by extending the analysis of Creswell et al.~Creswell2017 to nine LIGO--Virgo candidate events…S. C. Ulhoa, B. C. C. Carneiro, F. L. Carneiro et al.·Jul 12, 2026SaveLearn
Scalar-induced gravitational waves from a box-shaped curvature power spectrumWe compute the stochastic background of gravitational waves (GWs) produced at second order in cosmological perturbation theory by a primordial curvature power spectrum that is flat in k over a…Zu-Cheng Chen, Lang Liu·Jul 12, 2026SaveLearn
Nonlinear electrodynamics and stability of spherically symmetric space-times in scalar-tensor gravityWe study linear perturbations of static, spherically symmetric solutions of scalar-tensor theories (STT) of gravity from the Bergmann-Wagoner-Nordtvedt class, sourced by nonlinear electrodynamics…Kirill A. Bronnikov, Rustam Ibadov, Feruza Y. Shaymanova et al.·Jul 12, 2026SaveLearn
Polarization-dependent observational signatures of Weyl-coupled photons around a black holeA photon coupled non-minimally to the Weyl tensor propagates differently in its two linear polarization states: the vacuum around a black hole becomes a birefringent medium. On a Schwarzschild…Mao-Yuan Wan, Chen Wu·Jul 12, 2026SaveLearn
Scalarization of Einstein-Euler-Heisenberg black hole with multiple horizonsScalarizations of the Einstein-Euler-Heisenberg (EEH) black hole (EEHBH) with multiple horizons are investigated in the EEH-scalar theory by introducing a quadratic scalar coupling to the Maxwell…Hong Guo, Yun Soo Myung·Jul 12, 2026SaveLearn
Einstein Frame Regularization of the JNW Spacetime: From Brans-Dicke Singularity to Ellis WormholeWe propose a novel way to achieve the regularization of the JNW globally naked singularity sourced by the canonical Einstein minimally coupled scalar field (EMS). The key idea is to complexify (Wick…A. Bhattacharya, R. N. Izmailov, R. Kh. Karimov·Jul 12, 2026SaveLearn
Geodesics and shadows of the spindle-deformed Kerr black holeRecently, a new exact Ricci-flat rotating black-hole solution was constructed in four-dimensional general relativity, in which an additional parameter B characterizes a spindle deformation of the…Hong-Da Lyu, Mingzhi Wang, Shoulong Li·Jul 12, 2026SaveLearn
Scalar and Electromagnetic Perturbations around a Black Hole with a Topological Defect: Quasinormal Modes and Quasi-bound States in a Plasma MediumWe investigated the influence of a plasma environment on the optical and perturbative properties of a black hole with a topological defect, characterized by the parameter \(k\). We first established…Dilmurod Umarov, Farruh Atamurotov, Ahmadjon Abdujabbarov et al.·Jul 12, 2026SaveLearn
Geodesic completeness of singularity free gravityGeneralizing the gravitational potential first proposed in [1] we derive a large class of relativistic singularity free theories of gravity, which reduce to flat spacetime at large distances. We…Vasil Todorinov·Jul 12, 2026SaveLearn
Mapping Quasi-Periodic Oscillations to Lyapunov Exponent across Black Hole Thermodynamic Phase TransitionsWe investigate the thermodynamic phase structure of a nonminimally coupled magnetic AdS black hole through the dynamics of timelike particles. The free energy analysis reveals a Van der Waalslike…R. H. Ali, Xiao-Mei Kuang, Zi-Yu Tang·Jul 12, 2026SaveLearn
Revisiting Coincident GR in Internal STEGR FormulationWe revisit Coincident General Relativity (CGR) in the gauge approach to gravity based on Symmetric Teleparallel Equivalent to General Relativity (STEGR) in the internal-space formulation,…Kyosuke Tomonari, Taishi Katsuragawa, Shin'ichi Nojiri·Jul 12, 2026SaveLearn
Circular orbits and particle collisions close to charged black holes surrounded by scalar cloudsWe study the motion of massive (un)charged test particles in space-times of electric and dyonic black holes which carry scalar hair. We determine the stable and unstable circular orbits and discuss…Maria Chivers, Betti Hartmann, Katherine Horton et al.·Jul 11, 2026SaveLearn
Probing the Strong Equivalence Principle through the External Field Effect. How Do Two Masses Fall?Despite compelling evidence, the absence of a confirmed dark matter particle has sustained interest in modified gravity as an alternative explanation for the observed phenomenology. One prominent…Ankit Kumar, Kelvin Tang Tee Tniam, Peng Chengxiaohe et al.·Jul 11, 2026SaveLearn
Magnetising de Sitter and Anti-de Sitter spacetimesWe attempt to magnetise the de Sitter (dS) and Anti-de Sitter (AdS) spacetimes in spherical symmetry. First, the weak field case is considered where Maxwell's equation is solved to find magnetic…Yun-Ten Chin, Yen-Kheng Lim·Jul 11, 2026SaveLearn
Quasinormal modes of Bonanno-Reuter black holes via the Spectral MethodIn this work, we explore the quasinormal modes (QNMs) of the Bonanno-Reuter black hole, one of the first regular black hole metric suggested by the Asymptotically Safe Gravity (ASG) program. The…Davide Batic, Denys Dutykh, Fabio Scardigli·Jul 11, 2026SaveLearn
Matter Maps to Geometry in Gravitational CollapseWe establish an exact bidirectional map between the effective homogeneous interior density of a collapsing star and the exterior metric function in generalized Oppenheimer--Snyder collapse. The…H. Khodabakhshi, Zhi-Chao Li, H. Lu et al.·Jul 11, 2026SaveLearn
Improving calibration accuracy with torque coupled gravity field calibrator for sub-Hz gravitational wave observation in CHRONOSA fundamental challenge in low-frequency gravitational-wave detectors is the limited signal-to-noise ratio (SNR) of calibration lines, particularly in torsion-bar systems where the response is…Yuki Inoue, Daiki Tanabe, Vivek Kumar·Jul 11, 2026SaveLearn
Classification of Oppenheimer-Snyder Collapse: Singular, Bouncing, and Soft-Landing ScenariosWe study Oppenheimer-Snyder (OS) gravitational collapse matched to a general static, spherically symmetric exterior spacetime. Unlike the Schwarzschild case, two new features can arise in black holes…Zhi-Chao Li, H. Khodabakhshi, H. Lu·Jul 11, 2026SaveLearn
The Influence of Stable Photon Sphere Advent on Orbital Precession in moving towards the ExtremalityIn this work, we investigate the behaviour of the periapsis shift in static charged black-hole spacetimes, focusing on the interplay between extremality and the Aschenbach-like effect. We first…Mohammad Ali S. Afshar, J. Sadeghi·Jul 11, 2026SaveLearn
Shift vector sign reversal in the Alcubierre warp drive spacetime geometry and nonlinear Burgers-type dynamicsThis work investigates a sign reversal of the shift vector in the Alcubierre Warp Drive geometry and its effect on the nonlinear reduced structure of the Einstein equations. Previous analyses showed…Osvaldo L. Santos-Pereira, Everton M. C. Abreu, Marcelo B. Ribeiro·Jul 11, 2026SaveLearn
Scalar and vector bosons in a Bonnor-Melvin-Λ spacetime: an exact Duffin-Kemmer-Petiau analysisWe study scalar and vector bosons in the Bonnor--Melvin--Λ spacetime within the Duffin--Kemmer--Petiau (DKP) formalism. By employing Umezawa's projection operators, we separate the physical…Francisco A. Cruz Neto, Luis B. Castro·Jul 10, 2026SaveLearn
Entropy and Non-Collapse in Lorentzian GeometryIn this paper, we establish a geometric correspondence between the Lorentzian Raychaudhuri equation and Perelman's non-collapsing theorem for the Ricci flow. By interpreting the Raychaudhuri…Rohit Dhormare·Jul 10, 2026SaveLearn
Exceptional lines in the Kerr-Newman black hole spectrumWe investigate massive scalar perturbations of Kerr-Newman black holes, focusing on the (,m) = (1,1) quasinormal mode spectrum in the near-extremal regime. We identify a sequence of exceptional…João Paulo Cavalcante, Maurício Richartz·Jul 10, 2026SaveLearn
Hawking Radiation in f(R) Gravity: Survival of lighter black holesEinstein's theory of general relativity (GR) has been remarkably successful in describing gravitational phenomena. However, several open questions in modern cosmology and astrophysics (e.g.…Mriganka Dutta, Panchajanya Dey, Banibrata Mukhopadhyay·Jul 10, 2026SaveLearn
GRACE: An Open-Source Framework for GPU-Accelerated Numerical RelativityWe present GRACE, a new GPU-accelerated numerical-relativity framework designed to run efficiently on heterogeneous high-performance computing platforms. Developed from scratch and built exclusively…Carlo Musolino, Christian Ecker, Konrad Topolski et al.·Jul 10, 2026SaveLearn