Closed and broken electromagnetic orbits in Kerr--Newman spacetimeWe study future-pointing timelike solutions of the Lorentz force equation in the sub-extremal Kerr--Newman spacetime, with special attention to the time-machine region T, where the axial…Erasmo Caponio, Giulio Sanzeni, Stefan Suhr·Jun 22, 2026SaveLearn
Spacetime torsion fixes the mass and spin of gravitationally produced dark matterThe gravitational production of dark matter from stochastic gravitational waves requires the produced fermion to acquire a mass by unspecified late-time physics. We show that this mass is supplied by…Roh-Suan Tung·Jun 22, 2026SaveLearn
High-Stability Deformable Mirrors for Correcting Non-Axisymmetric Residual Aberrations in Thermal Compensation of Future Gravitational Wave InterferometersIn gravitational wave detectors, optical aberrations arise mainly from laser absorption in coatings and production process defects in the optics along the laser path. If left uncorrected, these…Luciano Antonio Corubolo, Matteo Lorenzini, Lorenzo Aiello et al.·Jun 22, 2026SaveLearn
Scattered wave functions and worldline instantons for particle production in curved spacetimeWe study the production of spin-1/2 particle-antiparticle pairs in curved spacetimes with nontrivial dependence on more than one coordinate. To this end, we develop two complementary approaches.…Philip Semrén, Greger Torgrimsson·Jun 22, 2026SaveLearn
Primordial Black Holes from Vector-Induced Curvature Perturbations Sourced by Primordial Magnetic FieldsGenerating an appreciable abundance of primordial black holes (PBHs) requires a substantial enhancement of primordial curvature perturbations on small scales. In this work, we propose a new…Chang Han, Zu-Cheng Chen, Hongwei Yu et al.·Jun 22, 2026SaveLearn
Polarization States and Effective Stress Energy Tensor of Gravitational Waves in Metric f(R) GravityWe investigate the polarization properties and effective stress--energy tensor of gravitational waves in metric f(R) gravity within the linearized approximation around Minkowski spacetime. Owing to…Sakshi Srivastava, Utkal Keshari Dash, Murli Manohar Verma·Jun 22, 2026SaveLearn
MaxWave Signal: Rapid, coherent maximum likelihood wavelet reconstruction of transient signals in gravitational wave dataAdvances in gravitational-wave detector sensitivity have increased the rate of transient signal detections, demanding faster automated analysis. We extend MaxWave, a fast maximum likelihood wavelet…Sudhi Mathur, Neil J. Cornish·Jun 22, 2026SaveLearn
Orientation matters: Consequences for gravitational-wave background detectabilityCross-correlation searches for gravitational-wave backgrounds depend on the geometrical configuration (physical separation and relative orientation) of the detectors comprising the network. Applying…Nelson Christensen, Joseph D. Romano, Mairi Sakellariadou et al.·Jun 22, 2026SaveLearn
Impact of the Einstein Telescope's duty cycle on the estimation of binary black holes parametersThe geometry of the Einstein Telescope, the proposed next-generation European gravitational-wave observatory, is yet to be finalized. Two competing designs are under consideration: a nested…Luca Negri, Thomas C. K. Ng, Thibeau Wouters et al.·Jun 22, 2026SaveLearn
BlackHawk v3.0: Hawking Radiation from Regular Black HolesWe present BlackHawk v3.0, a major update of the public code designed to compute Hawking radiation spectra of black holes. Building upon previous versions, this release considerably…Alexandre Arbey, Marco Calzà, Léa Malacher et al.·Jun 22, 2026SaveLearn
GrayHawk v2: wormholes and numeric extensionWe enlarged the capabilities of the publicly available Mathematica-based tool GrayHawk. This second version expands the spectrum of metrics that can be considered in two distinct and disjoined…Marco Calzá·Jun 22, 2026SaveLearn
Pitching Cosmic Curveballs: Environmental Effects on Extreme-Mass-Ratio Inspirals with Spinning SecondariesMuch like the aerodynamic deflection of a spinning curveball, a rotating secondary in an extreme-mass-ratio inspiral (EMRI) experiences Magnus and lift forces, in addition to the standard drag force,…Leif Lui, Lisa V. Drummond, Alejandro Torres-Orjuela·Jun 22, 2026SaveLearn
On the Universal Cuspy Behavior in Black Hole ShadowsThis work investigates the universality of cusp formation in the shadows of compact objects. The emergence of cusps is accompanied by three interrelated phenomena: a topological charge transition, an…Peng Cheng, Si-Jiang Yang·Jun 22, 2026SaveLearn
Non-metricity effects on electron scattering in bumblebee gravityWe investigate non-metricity effects on electron scattering in metric-affine bumblebee gravity, where spontaneous Lorentz symmetry breaking is induced by a vector field acquiring a nonzero vacuum…A. A. Araújo Filho·Jun 22, 2026SaveLearn
Local Origin of Hidden Symmetry in Rotating SpacetimesWe show that, within a broad stationary-axisymmetric class, Kerr-type separability and hidden symmetry arise as a local consequence of the Einstein equations. Without assuming separability, algebraic…Hyeong-Chan Kim·Jun 22, 2026SaveLearn
The effects of non Bunch-Davies initial conditions on gravitationally produced relicsTypical gravitational production of relics from amplification of inflationary perturbations assumes Bunch-Davies initial conditions, i.e. a vacuum with initially no particles. In this paper we…Enrico Bertuzzo, Gabriel M. Salla, Andrea Tesi·Jun 22, 2026SaveLearn
Computing nonlinearity ratios using second order black hole perturbation theoryWe revisit an analytical approximation scheme for computing nonlinearity ratios involving quadratic quasinormal modes (QQNMs). We compute these ratios for the general case when the QQNM is not one of…Jasveer Singh, Vardarajan Suneeta·Jun 22, 2026SaveLearn
A User-Friendly Python Interface for the Numerical Relativity Code AMSS-NCKUNumerical relativity has brought about profound and wide-ranging influences on modern astrophysics and gravitational-wave astronomy. In this study, we present a user-friendly Python interface for the…Chen-Kai Qiao, Yi Zheng, Zhou-Jian Cao·Jun 22, 2026SaveLearn
Physical properties of charged black holes from the nonlinear electrodynamics model based on electric potential regularizationWe investigate static, spherically symmetric black hole solutions arising from Einstein gravity minimally coupled to a nonlinear electrodynamics (NED) model constructed from a regularized electric…S. Habib Mazharimousavi·Jun 21, 2026SaveLearn
Bianchi IX dynamics with a phantom fieldWe consider Bianchi IX dynamics of a Universe filled with a massless phantom field. Such an exotic matter source enables regimes impossible in vacuum or with a standard scalar field. In particular,…Adel Awad, Dmitry Chirkov, Alexey Golovnev et al.·Jun 21, 2026SaveLearn
An Interplay Between Fractional Calculus and Holographic Dark EnergyThis dissertation aims to put forth a systematic construction of a fractional-calculus extension of holographic dark energy (HDE). We show that linking late-time cosmic acceleration to non-local or…Ayush Bidlan·Jun 21, 2026SaveLearn
Starobinsky-inflation in asymptotically safe shift-symmetric scalar-tensor theoryWe investigate the constraining power of scalaron-driven inflation on asymptotically safe scalar-tensor theories. Starting from a Horndeski-type theory and applying a renormalization group…Benjamin Koch, Cristobal Laporte, Frank Saueressig·Jun 21, 2026SaveLearn
Null geodesic defocusing in dynamical black-hole-to-white-hole transitionsWe investigate the defocusing of null geodesics in dynamical, non-singular black-hole-to-white-hole transitions. Working at the level of spacetime kinematics, and without assuming any specific…Johanna Borissova, Stefano Liberati, Matt Visser·Jun 21, 2026SaveLearn
Echoes of a hairy black hole from gravitational decouplingWe study axial gravitational perturbations of a hairy black hole constructed within the framework of gravitational decoupling and investigate the geometric origin of echo-like late-time signals in…Yi Yang, Ali Ovgun, Gaetano Lambiase et al.·Jun 21, 2026SaveLearn
Quantum dust cores of rotating black holesBlack holes are spacetimes that should describe the end state of the gravitational collapse of huge amounts of quantum matter. A quantum description of dust cores for black hole geometries that…Tommaso Bambagiotti, Roberto Casadio·Jun 21, 2026SaveLearn