Distinguishing wormholes via Einstein rings and global curvatureIn this work, we investigate the gravitational lensing properties of a static Ellis-Bronnikov wormhole embedded in a curved Friedmann-Lemaître-Robertson-Walker (FLRW) universe. By employing…M. B. Cruz, C. R. Muniz, R. M. P. Neves et al.·Jul 3, 2026SaveLearn
Electromagnetic radiation from a point-like charge in a weak gravitational wave: a Shapiro-delay-motivated approachWe investigate the field of a point-like electric charge freely falling in a gravitational wave. In the presence of a gravitational wave, the initially static Coulomb field of the charge becomes…Vladimir Epp, Konstantin Osetrin, Taya But·Jul 3, 2026SaveLearn
ACT Data and Positive Running of the Spectral Index for Scalar Theory and Modified GravityIn this work we address the possibility of having a positive running of the spectral index in inflationary theories. The recent ACT data indicate mildly that the running of the spectral index might…S. D. Odintsov, V. K. Oikonomou·Jul 3, 2026SaveLearn
The End of the Road for Bulk Fields in Warped Randall-Sundrum BraneworldsIn this manuscript we generalize Ref. [1] and derive a complete set of local consistency conditions for bulk fields in braneworld scenarios with an arbitrary number of dimensions. This provides the…G. Alencar, R. S. Almeida, R. N. Costa Filho et al.·Jul 3, 2026SaveLearn
Combining simulation-based inference and universal relations for precise and accurate neutron star scienceIn this work, we propose a novel approach for identifying, constructing, and validating precise and accurate universal relations for neutron star bulk quantities. A central element is…Christian J. Krüger, Sebastian H. Völkel·Jul 3, 2026SaveLearn
Extremalization approach to black hole thermodynamics: perturbations around higher-derivative gravitiesWhen higher-derivative terms are added to a gravitational action, black hole solutions and their thermodynamic properties are generally corrected. Recent progress has shown that, by treating…Aonan Zhang, Qiang Wang, Yong Xiao·Jul 3, 2026SaveLearn
Degrees of freedom of a quadratic scalar-nonmetricity theoryWe study the number of degrees of freedom (DOFs) in quadratic scalar-nonmetricity (QSN) theory, whose Lagrangian is the linear combination of five quadratic nonmetricity invariants with coefficients…Jia-Jun Chen, Zheng Chen, Xian Gao·Jul 3, 2026SaveLearn
The First Law of Black Hole Thermodynamics in Arbitrary Gravity and Matter Theories Using Differential FormsBlack hole thermodynamics plays a central role in probing the microscopic structure of spacetime. Since the 1990s, a general method for deriving the first law of black hole thermodynamics in…O. Ramirez, Y. Bonder·Jul 3, 2026SaveLearn
Geometric formulation of k-essence and late-time accelerationWe study a class of geometries in which nonmetricity is fully determined by a vectorial degree of freedom and three independent coefficients. Formulating the simplest linear action in this geometry,…Lehel Csillag, Erik Jensko·Jul 3, 2026SaveLearn
Quantum gravitational corrections to Reissner-Nordström black hole thermodynamics and their implications for the weak gravity conjectureIn this paper, we investigate the quantum gravitational corrections to the thermodynamical quantities of Reissner-Nordström black holes within the framework of effective field theory. The effective…Yong Xiao, Qiang Wang, Aonan Zhang·Jul 3, 2026SaveLearn
Interacting Holographic Dark Energy in f(Q) Gravity: Cosmological Evolution and Gravitational Wave SignaturesIn this paper, an interactive Holographic Dark Energy (HDE) model is studied in the framework of modified gravity \(f(Q)\). By adopting a power parameterization for the Hubble parameter, the field…N. Amiriborkhani, Alireza Amani, M. A. Ramzanpour·Jul 2, 2026SaveLearn
Observational Constraints on Kazakov-Solodukhin Quantum-Deformed Black Holes from M87* and Sgr A* ShadowsWe explore the Kazakov-Solodukhin quantum-deformed black hole spacetime, characterized by a single deformation parameter \( η\) that encodes quantum corrections to the classical Schwarzschild…A. Errehymy, Y. Khedif, M. Daoud et al.·Jul 2, 2026SaveLearn
Black Hole Persistence in Scalar Tensor TheoriesWe construct a perturbative scalar-tensor solution describing a central inhomogeneity embedded in an evolving cosmological background, with the aim of studying black hole persistence through a…Balkar Yildirim, Alan Albert Coley·Jul 2, 2026SaveLearn
The Direct Wave is Not a Meaningful Test of Horizon PropertiesRecently, a distinct non--quasinormal mode component of black hole binary merger radiation, named the direct wave, has been identified. The frequency and damping time of the direct wave have been…Anuj Kankani, Sean T. McWilliams·Jul 2, 2026SaveLearn
Nonlocal correlations of fermionic entanglement in the spacetime of Einstein-Gauss-Bonnet black holeThe investigation of nonclassical correlations in curved spacetimes offers key insights into the intersection of quantum information theory and gravitational physics. This paper studies two nonlocal…Yifei Xu, Yanjun Chen, Qi Xiao et al.·Jul 2, 2026SaveLearn
Boson Stars in Teleparallel Gravity with a Nonminimally Coupled Field: The Violation of Energy Conditions and Gravitational Waveforms from EMRIsIn this work, we investigate boson star models within the framework of teleparallel gravity with non-minimal coupling, and obtain static, spherically symmetric solutions for both the ground state and…Long-Xing Huang, Ke Yang, Yong-Qiang Wang·Jul 2, 2026SaveLearn
Neutron stars with primary scalar hairWe investigate static and spherically symmetric neutron star solutions endowed with primary scalar hair in a subfamily of Degenerate-Higher-Order-Scalar-Tensor (DHOST) theories of gravity. By solving…Hamza Boumaza, Christos Charmousis, David Langlois et al.·Jul 2, 2026SaveLearn
Phase Transitions with Lyapunov Exponents under Einstein and String Frames in Dilatonic Reissner--Nordström--AdS Black HolesWe investigate Lyapunov exponents as dynamical probes of black hole phase transitions in dilatonic Reissner--Nordström--AdS black holes within Einstein--Maxwell--dilaton theory. The thermodynamic…Hocheol Lee, Bogeun Gwak·Jul 2, 2026SaveLearn
Chaotic behaviors of particles around the black hole with an anisotropic matter immersed in a magnetic fieldWe present an exact solution to the Einstein-Maxwell equations that describes a static black hole coexisting with anisotropic matter immersed in an external magnetic field, obtained via the Harrison…Khusan Alibekov, Hocheol Lee, Yovqochev Pahlavon et al.·Jul 2, 2026SaveLearn
Rotating Black Holes and the Kerr/CFT Correspondence in Einstein-Bumblebee GravityWe constructed rotating black holes with equal angular momentum in five dimensional Einstein-Bumblebee gravity with and without cosmological constant. Their thermodynamic properties are examined via…Yu-Qi Chen, Jin-Yang Shen, Hai-Shan Liu·Jul 2, 2026SaveLearn
Classical and Loop Quantum Cosmology of Interacting Dark Energy: A Dynamical System Analysis with Superfluid Dark Matter and Dust MatterWe study the cosmological dynamics of interacting dark energy and dark matter in Classical Einstein Gravity and Loop Quantum Cosmology. Two dark matter scenarios are considered: superfluid dark…Mohd Shahalam, Koblandy Yerzhanov, Gulnur Bauyrzhan et al.·Jul 2, 2026SaveLearn
Particle dynamics and quasi-periodic oscillations of a Reissner--Nordström-like black hole in Kalb--Ramond gravity under an external magnetic test fieldWe investigate the dynamics of charged test particles and quasi-periodic oscillations around a Reissner--Nordström-like black hole in Kalb--Ramond (KR) gravity in the presence of an external magnetic…Faizuddin Ahmed, Ahmad Al-Badawi, Sardor Murodov et al.·Jul 2, 2026SaveLearn
Stability regions of glued wormholes with massless Kim-Lee backreacted spacetimes as interiorAsymptotic zero Arnowitt-Deser-Misner (ADM) mass wormholes, such as the zero-mass traversable Ellis-Bronnikov wormhole, are of great interest for astrophysical applications such as in the galactic…G. F. Akhtaryanova, R. Kh. Karimov, R. N. Izmailov et al.·Jul 2, 2026SaveLearn
First-order thermodynamics of multi-scalar-tensor gravityWe formulate a first-order thermodynamic description of Jordan-frame tensor--multi-scalar gravity. We derive the exact covariant 1+3 split of the geometric sector and recast it as an effective…David S. Pereira·Jul 2, 2026SaveLearn
Analytic Quasinormal Spectrum of Effective de Sitter Space in Generalized Proca TheoryQuasinormal modes describe the relaxation of perturbed black holes and relate ringdown observables to the background geometry. In this work we study the problem in a de Sitter setting within a…Zainab Malik·Jul 2, 2026SaveLearn