Parameterized Post-Newtonian Analysis of Quadratic Gravity and Solar System ConstraintsThis work systematically investigates the post-Newtonian behavior of general quadratic gravity in the weak-field regime. By extending the Einstein-Hilbert action to include quadratic curvature terms…Jie Zhu, Hao Li·Apr 27, 2026SaveLearn
Relative velocity in special relativity and quantum field theoryA derivation of the relative velocity used in the definition of the relativistic cross-section is given in terms of manifestly Lorentz invariant quantities. Along the way we find that there is a…David Garfinkle·Apr 26, 2026SaveLearn
From Big Bang Nucleosynthesis to Late-Time Acceleration in f(Q,Lm) GravityWe perform a comprehensive investigation of the early-to-late time cosmic evolution within the framework of f(Q,Lm) gravity, characterized by a non-minimal coupling between non-metricity and…Rajdeep Mazumdar, Kalyan Malakar, Kalyan Bhuyan·Apr 26, 2026SaveLearn
On gravitating dyonic configurations in nonlinear electrodynamicsWe consider static, spherically symmetric configurations of nonlinear electromagnetic fields with Lagrangians L(f), where f = Fμν Fμν, in general relativity (GR) and other metric theories…K. A. Bronnikov, S. V. Bolokhov, G. S. Nurbakova et al.·Apr 26, 2026SaveLearn
Photon regions, shadow observables and constraints from M87* of a Kerr-Newman-like black hole in Bumblebee gravity surrounded by plasmaIn this paper, we investigate the photon regions, shadow, and observational constraints of a Kerr-Newman-like black hole in Bumblebee gravity within a plasma medium. By employing a specific…Jian-Peng Zhang, Yu Zhang, Li Han·Apr 26, 2026SaveLearn
Physics informed operator learning of parameter dependent spectraSpectral problems governed by differential operators underpin a wide range of physical systems, yet remain computationally challenging because their spectra depend sensitively on continuous…Haohao Gu, Sensen He, Hanlin Song et al.·Apr 26, 2026SaveLearn
Gravitational Collapse of an Inhomogeneous Fluid in Rastall TheoryWe study spherically symmetric gravitational collapse of an inhomogeneous fluid with anisotropic energy momentum tensor (EMT) in Rastall gravity. Considering a linear equation of state (EoS) for the…Akbar Jahan, Naser Sadeghnezhad, Amir Hadi Ziaie·Apr 26, 2026SaveLearn
Forecasting graviton-mass constraints from the full covariance of PTA-astrometry ORF estimatorsWe develop a full-covariance formalism for pulsar timing array(PTA) -- astrometry verlap reduction function (ORF) estimators and use it to forecast graviton-mass constraints from a nanohertz…Jing-Hong Han, Zhi-Chao Zhao·Apr 25, 2026SaveLearn
A Complete Invariant Analysis of the Kerr Spacetime and its Photon RegionWe present an invariant characterization of the Kerr spacetime, and utilize the invariant structure of the spacetime to derive a function whose zeros identify a special family of null geodesics. Each…Nicholas Layden, Dipanjan Dey, Alan Coley·Apr 25, 2026SaveLearn
Spectral Butterfly Effect and Resilient Ringdown in Thick BraneworldsThe quasinormal mode spectrum is a unique fingerprint linking gravitational-wave observations to extra-dimensional geometry. In this Letter, we show that thick braneworlds exhibit a spectral…Hai-Long Jia, Wen-Di Guo, Yu-Peng Zhang et al.·Apr 25, 2026SaveLearn
Assessing EMRI Detectability of the Rotating Quantum Oppenheimer-Snyder Black HoleThis letter presents an assessment of quantum gravity effects on extreme-mass-ratio inspirals (EMRIs) for the rotating quantum Oppenheimer-Snyder (qOS) black hole. Employing the adiabatic evolution,…Dan Zhang, Shulan Li, Guoyang Fu et al.·Apr 25, 2026SaveLearn
Exploring Rényi Entropic Cosmology Constrained by DESI DR2 BAO and Complementary Late-Time ObservationsWe investigate the late-time cosmological viability of Rényi entropic cosmology (REC) by confronting its modified Friedmann dynamics with DESI DR2 BAO, cosmic chronometers, gravitational-wave…Rajdeep Mazumdar, Kalyan Malakar, Kalyan Bhuyan·Apr 24, 2026SaveLearn
Solving Einstein's Equation Numerically on Manifolds with Non-Orientable Spatial SlicesThis paper presents solutions to Einstein's equation -- and the numerical methods used to construct them -- that describe simple cosmological models on manifolds with compact non-orientable…Fan Zhang, Lee Lindblom·Apr 24, 2026SaveLearn
Radiation outer boundary conditions and near-to-far field signal transformations for the Bardeen-Press equationSeveral theoretical and astrophysical problems - including gravitational-wave modeling for extreme mass-ratio inspirals - require accurate time-domain solutions of the spin-weight s=-2 Teukolsky…Som Dev Bishoyi, Scott E. Field, Stephen R. Lau·Apr 24, 2026SaveLearn
Preserving the Energy-Momentum Tensor in f(R, Matter) TheoriesIn certain modified theories of gravity, non-minimal couplings between matter and geometry lead to the nonconservation of the energy-momentum tensor. By interpreting this as an effective dissipative…Szőllősi Tamás-Géza·Apr 24, 2026SaveLearn
Kahler decoupling for Kerr perturbationsThe Euclidean Kerr metric is conformal, in two distinct ways, to a Kahler metric, with conformal factors determined by the repeated eigenvalue of the two chiral halves of the Weyl curvature. A…Stephen R. Green, Kirill Krasnov, Adam Shaw·Apr 24, 2026SaveLearn
Simulation-based Inference for Gravitational Waves from Binary Neutron Stars: Application of Summary Data from HeterodyningGravitational-wave parameter estimation for binary neutron star (BNS) systems poses severe computational challenges due to the extended signal duration, which can reach several minutes in current…Masaki Iwaya, Vivien Raymond, Soichiro Morisaki et al.·Apr 24, 2026SaveLearn
Data-Driven Acceleration of Eccentricity Reduction for Binary Black Hole SimulationsReducing orbital eccentricity in numerical relativity simulations of binary black holes is essential for producing astrophysically relevant gravitational wave models, as many of these systems are…Vittoria Tommasini, Nils L. Vu, Mark A. Scheel et al.·Apr 23, 2026SaveLearn
Bianchi-I Cosmology with Radiation in Asymptotically Safe GravityWe study the late-time evolution of an anisotropic Bianchi-I universe with radiation in the framework of asymptotically safe gravity. We first discuss the radiation-dominated universe for the perfect…Chiang-Mei Chen, Ting-Kui Fan, Rituparna Mandal et al.·Apr 23, 2026SaveLearn
Perturbation Dynamics and Structure Formation in Extended Proca-Nuevo GravityA comprehensive analysis of cosmological perturbations and structure formation is presented for the Extended Proca-Nuevo (EPN) framework, a vector-tensor extension of General Relativity with a…N. S. Kavya, Avik De, Tee-How Loo·Apr 23, 2026SaveLearn
Quantum-information diagnostics of cosmological perturbations with nontrivial sound speed in inflationIn this work, we systematically investigate the quantum-information diagnostics of cosmological perturbations with a nontrivial sound speed, utilizing a normalized open two-mode squeezed-state…Shi-Cheng Liu, Lei-Hua Liu, Bichu Li et al.·Apr 23, 2026SaveLearn
Conformal anomaly transport induced by dark photonWe have considered the problem of the influence of inhomogeneity of gravitational field on transport effects predicted by the field theory describing massless Dirac fermions in the Maxwell and dark…Marek Rogatko, Karol I. Wysokinski·Apr 23, 2026SaveLearn
Exploring the statistical anisotropy of primordial curvature perturbations with pulsar timing arraysThe recent detection of a stochastic gravitational wave background by pulsar timing arrays has opened a new window in understanding supermassive black hole binaries and in probing the universe at the…Fengting Xie, Zhi-Chao Zhao, Qing-Hua Zhu et al.·Apr 23, 2026SaveLearn
Chaotic dynamics of charged particles near weakly magnetized black holes in Einstein-ModMax TheoryThis paper presents a systematic study of the chaotic dynamics of charged test particles around purely magnetically charged black holes immersed in a uniform external magnetic field within the…Zijian Liu, Wenfu Cao·Apr 23, 2026SaveLearn
Radiation properties of a regular black hole embedded in a Dehnen-type dark matter halo with a thin accretion diskWe investigate the shadow, timelike geodesic structure, radiation properties of thin accretion disks, and optical appearance of a static spherically symmetric regular black hole, constructed based on…Tianyou Ren, Jing-Ya Zhao, Xiaomei Liu et al.·Apr 23, 2026SaveLearn