Ovcharenko-Podolsky Einstein-Maxwell gravitational instantonsWe present an explicit three-parameter family of toric Einstein-Maxwell gravitational instantons. These are complete Riemannian manifolds with vanishing scalar curvature which satisfy the Riemannian…Hari K. Kunduri·Sep 9, 2026SaveLearn
Probing quantum chaos near a wormhole throat with a circular stringWe investigate whether quantum fluctuations of a circular probe string develop a quantum-chaotic response while traversing a wormhole throat. The classical circular-string embedding is periodic and…Ai-chen Li, Xin-Fei Li, Xuanting Ji·Sep 9, 2026SaveLearn
Non-equilibrium thermodynamics of an expanding Swiss-Cheese braneworld cosmology with a matter bounceWe investigate the non-equilibrium thermodynamics of a Swiss-cheese (SC) braneworld universe. By employing Hayward's unified first law and the Clausius relation at the apparent horizon, we first…Nasr Ahmed·Sep 8, 2026SaveLearn
Emergence of Gravity's Dynamical and Topological Sectors from Pre-geometryWe identify the complete set of fundamental building blocks for a 4D pre-geometric theory of gravity. Based on a gauge theory of SO(1,4) or SO(2,3) coupled to a Higgs-like field under the rigid…Andrea Addazi, Giuseppe Meluccio·Sep 8, 2026SaveLearn
From driven oscillations to free ringdown: a particle plunging into KerrWe show that a ringdown waveform can admit a constant-coefficient quasinormal-mode (QNM) representation while its individual QNM-pole contributions remain driven. To establish this result, we…Colin Weller, Andrew Laeuger, Fulin Li et al.·Sep 8, 2026SaveLearn
Shadows and gravitational perturbations of black bouncesWe investigate axial gravitational perturbations and shadow formation in black-bounce geometries supported by anisotropic fluids within general relativity. Two distinct classes of solutions are…Alana C. L. Santos, Leandro A. Lessa, Roberto V. Maluf et al.·Sep 8, 2026SaveLearn
Space-Based Lock-In Determination of Newton's Gravitational ConstantInspired by a recent ground-breaking space-based measurement of Newton's gravitational constant, we outline a proposal for a general layout of an optimized space-based approach that combines the…Ulrich D. Jentschura·Sep 8, 2026SaveLearn
Perturbations of Charged Black Holes with Higher-Order InteractionsWe study linear gravitational perturbations and the corresponding quasinormal-mode spectra of electrically and magnetically charged black holes in the presence of higher-order corrections to the…Oleksandr S. Stashko, Roman A. Konoplya, Mark P. Hertzberg·Sep 8, 2026SaveLearn
Gravitational Radiation from Shockwave Scattering in the Self-Force EFTWe investigate the high-energy collision of two spinless bodies within the Self-Force Effective Field Theory, taking one of the two bodies to be massless and highly energetic, such that it generates…Emanuele Rosi·Sep 8, 2026SaveLearn
Ruling out matter-induced bumps in black-hole effective potentialsMatter fields localized around black holes can produce small secondary bumps in the effective potentials governing black-hole perturbations, potentially leading to quasinormal-mode spectral…Matteo Della Rocca, Romeo Felice Rosato, Paolo Pani·Sep 8, 2026SaveLearn
Gravitational quantum friction and the information-loss problemWe study the gravitational collapse of a shell, modeled as a coherent state of quantum matter. Without adding any physics beyond semiclassical gravity, we show that the universal gravitational…Francesco Del Porro, Francesco Di Filippo·Sep 8, 2026SaveLearn
Reconstructing sign-switching dark energy histories: Scalar-field regularity, conditional potential comparison, and representative dynamicsPhenomenologically similar sign-switching dark-energy histories need not have comparable scalar-field realizations. We reconstruct minimally coupled scalars with fixed kinetic sign for three…Shahnawaz A. Adil, Özgür Akarsu, Mariam Bouhmadi-López et al.·Sep 8, 2026SaveLearn
On The Regularized McVittie Black Bounce and a Family of Traversable WormholesThe McVittie metric describes a self-gravitating compact object embedded in an expanding universe. It inherits two singularities: a curvature singularity at r 0 and a cosmological singularity…Soumya Chakrabarti, Chiranjeeb Singha·Sep 8, 2026SaveLearn
Static spherically symmetric electroweak models with fermions and gravityIn this article we provide a systematic reduction to static spherical symmetry for (classical) gauge theoretic models with structure group SU(2) x U(1), coupled to gravity. In particular, we derive…Marko Sobak·Sep 8, 2026SaveLearn
Persistence of measurement-induced nonlocality in uniformly accelerating Unruh-DeWitt detectorsUniform acceleration induces a thermal response to the Minkowski vacuum and can thereby modify quantum correlations. For measurement-induced nonlocality (MIN), a form of nonclassical correlation…Shi-Pu Gu, Ming-Ming Du, Yu-Bo Sheng et al.·Sep 8, 2026SaveLearn
Black holes with torsion hair in cubic Holst-type Poincaré gauge gravity: from singular to regular geometriesMotivated by the singularity theorems of Poincaré Gauge (PG) theory, we investigate extensions of the Holst quadratic model by introducing cubic order invariants constructed from the curvature and…Sebastian Bahamonde, Jorge Gigante Valcarcel, Matteo Magi·Sep 8, 2026SaveLearn
Picard Iteration for the Characteristic Initial Value Problem in Einstein EquationsWe present an iteration algorithm for vacuum and Einstein scalar-field equations in double-null gauge, which transform the non-linear PDE into systems of ODE. The numerical realization combines…Shengrong Wu·Sep 8, 2026SaveLearn
Dynamical systems in quadratic teleparallel cosmologyWe discuss the cosmological dynamics of general teleparallel quadratic gravity. Using a suitable set of variables, we write the cosmological field equations as a homogeneous dynamical system. We find…Manuel Hohmann·Sep 8, 2026SaveLearn
Particle Dynamics and Thermodynamics of a Charged-Like Hairy Black Hole in Extended Gravitational DecouplingThis work focuses on the analysis of particle dynamics and the thermodynamic properties associated with a particular branch of hairy black hole solutions. These solutions are obtained by using…M. Zeeshan Gul, Ahmad Al-Badawi, J. Andrade et al.·Sep 8, 2026SaveLearn
Kerr-referenced analytical parametrization of rotating black holes in dynamical Chern-Simons gravityRotating black holes in dynamical Chern-Simons gravity are known nonperturbatively mainly through numerical solutions, which limits their direct use in strong-field applications. We construct a…Sardor Murodov, Bahodir Ahmedov, Bekzod Rahmatov et al.·Sep 8, 2026SaveLearn
Cosmological extra dimensions can mimic dark energyWe present a simple model of a higher dimensional spacetime in which the 4d submanifold is a FLRW metric, while the extra dimensions are compactified to a hypersphere. We calculate the Friedmann…Mattia Villani·Sep 8, 2026SaveLearn
Scalarized Einstein-Euler-Heisenberg black holes at the approach to extremalityWe investigate extremal black holes with scalar hair in the generic Einstein-Euler-Heisenberg (EEH)-scalar theory with two scalar couplings to the Maxwell term. One is an exponential coupling with…Hong Guo, Xiao Yan Chew, Yun Soo Myung·Sep 8, 2026SaveLearn
Noether and Mei symmetries in static spherically symmetric quadratic gravity: variational consistency, constraints, and conserved curvature fluxThe symmetry content of static spherical f(R) gravity is reconsidered for the pure quadratic model. We first derive the radial action without prematurely eliminating the equation carried by the…G. G. N. Nashed, A. Eid, Kazuharu Bamba·Sep 7, 2026SaveLearn
Survey of Novel Deep Learning Architectures for Denoising Gravitational-wave SignalsGravitational-wave denoising must handle the full diversity of spinning, precessing binaries, since the recovered waveform underpins parameter estimation, tests of general relativity, and population…Rohan Raha, Prayush Kumar·Sep 7, 2026SaveLearn
Black Holes, Gravitational Waves and Space-Time Singularities Lemaitre Conference 2024This editorial introduces the topical collection arising from the Lemaitre Conference 2024 - the second in a series of meetings dedicated to the scientific legacy of Georges Lemaitre - held at the…Massimo Bianchi, Sergio Luigi Cacciatori, Matteo Galaverni et al.·Sep 7, 2026SaveLearn