Gravitational entropy in Petrov Type I spacetimesThe gravitational entropy proposal of Clifton, Ellis and Tavakol (CET) is based on an effective energy momentum tensor formed by the algebraic decomposition of the 4th order Bel-Robinson tensor. So…Maharshi Sarma, Sebastián Nájera, Roberto A. Sussman·May 20, 2026SaveLearn
Post-Newtonian orbital mechanics around a black hole in modified gravityScalar-tensor-vector gravity, also known as modified gravity (MOG), has emerged as an alternative to General Relativity (GR). It aims to explain astrophysical phenomena without invoking dark matter.…Ioannis Liodis, Gernot Heissel, Rita Mastroioanni et al.·May 20, 2026SaveLearn
ModMax-black hole surrounded by cloud of strings in Bumblebee gravityIn this article, we investigate the optical, thermodynamic, and scattering properties of a ModMax black hole surrounded by a cloud of strings within the framework of Einstein-bumblebee gravity. We…Fernando M. Belchior, Allan R. P. Moreira, Abdelmalek Bouzenada et al.·May 20, 2026SaveLearn
The impact of seasonality over the sensitivity of Einstein Telescope and the SNR of CBC signals at the Sardinia candidate siteThis work presents the first investigation of the impact of seasonal variations in seismic noise on the low-frequency performance of the Einstein Telescope (ET) at the Sardinia candidate site,…Matteo Di Giovanni, Davide Rozza, Giovanni Diaferia et al.·May 20, 2026SaveLearn
Pole Skipping, Avoided Crossing, and Resonant Excitation in Kerr Quasinormal Modes near Algebraically Special FrequenciesKerr quasinormal modes near algebraically special frequencies exhibit anomalous behavior, including apparent bifurcation, disappearance, and a nonsmooth connection to the Schwarzschild limit, which…Kei-ichiro Kubota, Hayato Motohashi·May 20, 2026SaveLearn
Merger remnant and eccentricity dynamics surrogates for eccentric nonspinning black hole binariesAccurate models of merger remnants are increasingly important for gravitational-wave science, including precision tests of gravity with ringdown, inference of black-hole populations, and modeling…Adhrit Ravichandran, Peter James Nee, Keefe Mitman et al.·May 20, 2026SaveLearn
Eikonal quasinormal modes, greybody factors and shadow of charged accelerating black holesWe show that the quasinormal modes, in the eikonal limit, for accelerating (non-rotating) black holes, are related to the angular velocity of the circular null geodesics and to the corresponding…Filipe Moura, Francisco Silva·May 20, 2026SaveLearn
Gauss-Bonnet scalarization of charged qOS-black holesThe Gauss-Bonnet (GB) scalarization for charged quantum Oppenheimer-Snyder (cqOS)-black holes is investigated in the Einstein-Gauss-Bonnet-scalar theory with the nonlinear electrodynamics (NED) term.…Hong Guo, Wontae Kim, Yun Soo Myung·May 20, 2026SaveLearn
Can Oscillatory and Persistent Nonlinearities Be Bridged in Black Hole Ringdown?Quadratic quasinormal modes (QQNMs) and Christodoulou memory effect are key nonlinear phenomena in gravitational wave physics. QQNMs characterize the near zone nonlinear response of a perturbed black…Jun-Xi Shi, Zhen-Tao He, Jiageng Jiao et al.·May 20, 2026SaveLearn
Testing the Spacetime Geometry of Sgr A* with the Relativistic Orbit of S2 starIn this work, we perform a relativistic test of the spacetime geometry of Sagittarius A* (Sgr A*) using the orbit of the S2 star. We consider a broad class of compact object models, including…Parth Bambhaniya, Preet Dalal, Giovani H. Vicentin et al.·May 20, 2026SaveLearn
Critical spacetime crystals in continuous dimensionsWe numerically construct a one-parameter family of critical spacetimes in arbitrary continuous dimensions D>3. This generalizes Choptuik's D=4 solution to spherically symmetric massless…Christian Ecker, Florian Ecker, Daniel Grumiller et al.·May 20, 2026SaveLearn
Detectability of Gravitational-Wave Memory with LISA: A Bayesian ApproachGravitational wave (GW) astronomy opens a new venue to explore the universe. Future observatories such as LISA, the Laser Interferometer Space Antenna, are expected to observe previously undetectable…Adrien Cogez, Silvia Gasparotto, Jann Zosso et al.·May 20, 2026SaveLearn
Superluminal modes in a quantum field simulator for cosmology from analog trans-Planckian physicsThe quantum-field-theoretic description for the U(1)-Goldstone boson of a scalar Bose-Einstein condensate with time-dependent contact interactions is developed beyond the acoustic approximation in…Christian F. Schmidt, Stefan Floerchinger·May 20, 2026SaveLearn
Quintessence-dominated cyclic universe with negative cosmological constantWe investigate two simplified non-singular cyclic models with a negative time-varying cosmological constant to represent the non-conventional mechanism of negative cosmological constant expected to…Nasr Ahmed, Kazuharu Bamba·May 20, 2026SaveLearn
Explicit and covariant formula for thermodynamic volume in extended black hole thermodynamicsIn extended black hole thermodynamics, the cosmological constant and other couplings are treated as thermodynamic variables, yielding the first law $δM = TδS+ΩδJ +V…Yong Xiao, Yu-Xiao Liu, Yu Tian et al.·May 20, 2026SaveLearn
Finite Curvature Construction of Regular Black Holes and Quasinormal Mode AnalysisWe develop a class of regular black holes by prescribing finite curvature invariants and reconstructing the corresponding spacetime geometry. Two distinct approaches are employed: one based on the…Chen Lan, Zhen-Xiao Zhang, Hao Yang·May 20, 2026SaveLearn
Constraining Black Hole Parameters in Non-Commutative Geometry using Machine LearningMotivated by string theory, we constrain non-commutative black hole parameters through shadow behaviors using machine learning techniques combined by CUDA computations. To do so, we first investigate…Maryem Jemri·May 19, 2026SaveLearn
Long-lived quasinormal modes of Asymptotically de Sitter Black Holes in Generalized Proca TheoryMassive scalar perturbations of asymptotically de Sitter black holes in generalized Proca theory display a sharp interplay between primary hair, horizon structure, and field mass. Using high-order…S. V. Bolokhov·May 19, 2026SaveLearn
Convergence of post-Newtonian for quasi-circular non-precessing comparable mass ratios BBHsPost-Newtonian (PN) theory provides the analytic foundation for modeling the early inspiral of binary black holes. However, as an asymptotic series, successive PN orders do not necessarily improve…Dongze Sun, Béatrice Bonga, Leo C. Stein et al.·May 19, 2026SaveLearn
Light Deflection due to Spinoptic Effects in Parametrized and Spherically Symmetric Hairy Black HolesIn the standard geometric optics approximation, null rays propagating in a spherically symmetric black hole background follow planar geodesics. This picture changes, however, when the…Kelvin S. Alves, Rogerio T. Cavalcanti, Santiago E. Perez Bergliaffa·May 19, 2026SaveLearn
Remarks on electrical Penrose process for magnetized Reissner-Nordström black holeThe energy extraction from a magnetized Reissner-Nordström black hole is analyzed within the framework of the electric Penrose mechanism. The presence of an external magnetic field induces an…A. Baez, Nora Breton, I. Cabrera-Munguia·May 19, 2026SaveLearn
Transfer observables of rotating acoustic black holes from ray tracing: shadow centroid, redshift asymmetry and flux imbalanceWe construct an impact-parameter-resolved transfer framework for null acoustic rays in the rotating draining-bathtub spacetime. The formalism separates the source-independent ray geometry from the…Faizuddin Ahmed, Ahmad Al-Badawi, Fernando M. Belchior et al.·May 19, 2026SaveLearn
A novel pre-inflationary model in view of the lack of angular correlation of CMBIn this paper we propose a novel unified cosmological model that connects a pre-inflationary epoch, starting at the Planckian time, with the onset of inflation within a single scalar-field framework.…M. Montes, José Edgar Madriz Aguilar, A. Bernal et al.·May 19, 2026SaveLearn
The Role of Gravitational Energy Flux in Cosmic AccelerationThe article deals with the role of gravitational radiation energy in the large-scale dynamics of the universe. Motivated by the observed accelerated expansion, we investigate whether gravitational…S. C. Ulhoa, F. L. Carneiro, J. W. Maluf·May 19, 2026SaveLearn
Scattering and absorption of a charged massive scalar field by a Reissner-Nordström black hole surrounded by perfect fluid dark matterWe study the scattering of charged massive particles impinging on a Reissner-Nordström (RN) black hole immersed in perfect fluid dark matter (PFDM). We obtain an approximation of absorption cross…Hai Huang, Xudong Sun, Juhua Chen·May 19, 2026SaveLearn