Detecting gravitational waves by emission of photons from charged Weber barsIn this work, we propose a novel experimental set-up using charged resonant gravitational wave detectors. We exploit the semi-classical analogue of the Gertsenshtein effect where the gravitational…Soham Sen·Jul 13, 2026SaveLearn
Observational Signatures of Rotating Ayón-Beato-García Black Holes: Shadows, Accretion Disks and ImagesWe investigate the shadows, accretion disks, and observational images of rotating Ayón-Beato--Garc\'ıa (ABG) black holes with mass M, spin a, and nonlinear-electrodynamics (NLED) charge…Zhenglong Ban, Meng Chen, Rong-Jia Yang·Jul 13, 2026SaveLearn
Lagrangian Identity and Mass Evolution of Particle-like Objects in Nonminimally Coupled GravityWe show that the Lagrangian of a Nambu-Goto p-brane satisfies the identity L [ p ]=T [ p ]/(p+1), with T [ p ] denoting the trace of the…S. R. Pinto, P. P. Avelino·Jul 13, 2026SaveLearn
Emergent inflation in fractional cosmologyWe investigate the evolution of the early universe within the proposed fractional cosmological framework. The underlying formulation is conceptually rooted in generalized measure constructions,…S. M. M. Rasouli·Jul 13, 2026SaveLearn
Signatures of a subpopulation of hierarchical mergers in the GWTC-4 gravitational-wave datasetRepeated black-hole mergers in dense stellar clusters are a plausible mechanism to populate the predicted gap in black hole masses due to the pair-instability supernova process. These hierarchical…Cailin Plunkett, Thomas Callister, Michael Zevin et al.·Jul 13, 2026SaveLearn
A New Definition of Horndeski Theory and the Possibility of Multiple Scalar Field ExtensionsIn the single-field case, Horndeski provides the most general scalar-tensor theory with second-order field equations. By contrast, systematic multi-field extensions remain incomplete: while the…Tomoki Katayama·Jul 13, 2026SaveLearn
Gravitational waves in Cubic Metric-Affine GravityWe derive new exact gravitational wave solutions with dynamical torsion and nonmetricity tensors in the framework of cubic Metric-Affine Gravity (MAG). For this purpose, we consider the full…Sebastian Bahamonde, Jorge Gigante Valcarcel, José M. M. Senovilla·Jul 13, 2026SaveLearn
Metric reconstruction and the Hamiltonian for eccentric, precessing binaries in the small-mass-ratio limitWe calculate the first-order (in the mass-ratio) metric perturbation produced by a small body on an eccentric, precessing bound orbit about a Kerr black hole. We reconstruct the metric perturbation…Zachary Nasipak·Jul 13, 2026SaveLearn
Inflaton Dynamics in Higher-Derivative Scalar-Tensor Theories of GravityDuring inflation, higher derivative terms in the gravitational action may play a significant role. Building on new stable formulations of four-derivative scalar-tensor theories, we study the impact…Sam E. Brady, Katy Clough, Pau Figueras et al.·Jul 13, 2026SaveLearn
Energy Balance of a Bose Gas in Curved SpacetimeClassical solutions of the Klein-Gordon (KG) equation are used in astrophysics to model galactic halos of scalar field dark matter and compact objects such as cores of neutron stars. These bound…Tonatiuh Matos, Ana Avilez, Tula Bernal et al.·Jul 13, 2026SaveLearn
Comparing twist-free axisymmetric gravitational waves near the black hole thresholdThe threshold of black hole formation in axisymmetric vacuum gravity is proving to be more complicated than had been anticipated but, following recent advances, a consensus between independent codes…Ananya Adhikari, Tomáš Ledvinka, Daniela Cors et al.·Jul 12, 2026SaveLearn
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