Gravitational Waves as Thermodynamic Shear Excitations in Scalar-Tensor GravityCan a propagating spin--2 mode participate in a local thermodynamic process without assigning an autonomous entropy or a unique local energy to the wave itself? We show that this occurs in…David S. Pereira·Jul 17, 2026SaveLearn
Probing f(R) AdS Black Hole via Hawking Evaporation, Shadows and Thermal FluctuationsThe process of Hawking evaporation, shadows and thermal fluctuations are investigated within the fabric of f(R) AdS Black Hole (BH). Specifically, the Hawking evaporation process is analyzed…Muhammad Israr Aslam, Saira Waheed, Rabia Saleem et al.·Jul 17, 2026SaveLearn
No late-time role for adiabatic torsion: a no-go result for Hubble-cutoff holographic dark energy in Einstein--Cartan cosmologyIn Friedmann cosmology with Einstein--Cartan torsion, the homogeneous torsion mode compatible with a separately conserved matter sector scales as Φ a-3 and enters the Friedmann constraint…Fernando Izaurieta, Samuel Lepe, Cristian Quinzacara·Jul 17, 2026SaveLearn
Comparison of f(R,T) Gravity with Multiple DatasetsWe examine f(R,T)=R+λTε gravity models by finding the best fit parameters for various values of ε. This is accomplished by analyzing data from the cosmic microwave background, baryon acoustic…Vincent R. Siggia, Eric D. Carlson·Jul 17, 2026SaveLearn
Massless scalar scattering by Kerr-Bertotti-Robinson black holes:transparent-end channels and superradianceWe formulate and numerically solve the real-frequency scattering problem for a neutral, minimally coupled, massless scalar on the rotating Kerr--Bertotti--Robinson (Kerr--BR) black-hole geometry,…Hai Huang, Xudong Sun, Juhua Chen·Jul 17, 2026SaveLearn
Accelerating electrically charged ModMax black hole solutions in F(R) gravityUsing the C-metric in the context of F(R) gravity coupled with the ModMax nonlinear electromagnetic field (the F(R)-ModMax theory), we derive an exact black hole solution in a four-dimensional…B. Eslam Panah, N. Heidari, A. Rincón·Jul 17, 2026SaveLearn
On dark sector scalar field theories driven by cosmological c-fieldsThe interplay of Hoyle-Narlikar (HN) creation field cosmology and scalar field models for the dark sector, including the generalized Chaplygin Gas (GCG), is investigated . Though originating from…Alex E. Bernardini, Orfeu Bertolami·Jul 17, 2026SaveLearn
Optical and Thermodynamic Signatures of Lorentz Symmetry Breaking in Bumblebee AdS Black HolesWe investigate the impact of spontaneous Lorentz symmetry breaking on scalar wave propagation, null geodesics, and thermodynamic behavior of four-dimensional asymptotically AdS black holes in…Behzad Eslam Panah, Abdullah Guvendi, Semra Gurtas Dogan et al.·Jul 17, 2026SaveLearn
The weight of light: colliding pulses of radiation in General RelativityWe study the gravitational interaction of very strong pulses of electromagnetic radiation, up to and beyond gravitational collapse. We demonstrate the existence of very compact states close to the…Jorge Expósito Patiño, Vitor Cardoso, Hannes R. Rüter·Jul 17, 2026SaveLearn
Einstein crystals in Snyder and Snyder-de Sitter noncommutative backgroundsWe investigate the behavior of Einstein crystals in noncommutative backgrounds described by the Snyder and Snyder-de Sitter models. Possible novel effects, which may arise in realistic systems such…Anna Pachoł, Aneta Wojnar·Jul 17, 2026SaveLearn
Scalar quasinormal modes of Schwarzschild--anti-de Sitter black holes: spectral analysis and generalized boundary conditionsWe study quasinormal modes (QNMs) of a minimally coupled massless scalar field on four-dimensional Schwarzschild--anti-de Sitter black holes using a Chebyshev spectral method. After compactifying the…Davide Batic, Alan S. Cornell, Denys Dutykh·Jul 17, 2026SaveLearn
Viscous Accretion Disks around Regular Black Holes Embedded in a Quintessence Dark Energy Field: Beyond the Novikov--Thorne ApproximationWe develop a comprehensive relativistic framework for geometrically thin, optically thick Shakura--Sunyaev α-viscous accretion disks around rotating Hayward regular black holes embedded in a…Sandip Dutta·Jul 17, 2026SaveLearn
Thin-shell wormholes in cosmic voidsCosmic voids are underdense regions that can provide an effective large-scale environment with a de Sitter-like gravitational behavior. Motivated by recent black-hole solutions embedded in void…Jonathan A. Rebouças, Edson Otoniel, Francisco S. N. Lobo·Jul 17, 2026SaveLearn
Ringdown and lensing of triple systemsTriple systems have progressively been recognized as ubiquitous in our Universe and provide a good testing ground for wave generation and propagation in nontrivial environments. We study the dynamics…Vitor Cardoso, Giuseppe Ficarra, Jaime Redondo-Yuste et al.·Jul 17, 2026SaveLearn
Gravitational-wave astronomy requires population-informed parameter estimationGravitational-wave events are interpreted in terms of Bayesian posteriors for their source properties inferred under unphysical reference priors. Though these parameter estimates are important…Matthew Mould, Rodrigo Tenorio, Davide Gerosa·Jul 17, 2026SaveLearn
Dynamics for Spin-1/2 Particles in Einstein-Gauss-Bonnet GravityIn this work, I investigate the quantum dynamics of a spin-1/2 particle propagating in the spacetime of a static, spherically symmetric Einstein-Gauss-Bonnet (EGB) black hole within the framework of…E. Maciel·Jul 17, 2026SaveLearn
On regular black string spacetimes in nonlinear electrodynamicsIn this work, we investigate the coupling of General Relativity with Nonlinear Electrodynamics (NED), governed by a general Lagrangian L(F), to address the axial singularity of…G. Alencar, V. H. U. Borralho, T. M. Crispim et al.·Jul 17, 2026SaveLearn
(Lovelock)2 inflation: explaining the ACT data and equivalence to Higgs-Gauss-Bonnet inflationWe revisit the Starobinsky model of inflation in light of recent data from the Atacama Cosmology Telescope (ACT), which indicates a potential preference for a slightly larger scalar spectral index…Andrea Addazi, Yermek Aldabergenov, Daulet Berkimbayev et al.·Jul 17, 2026SaveLearn
Unified dynamical system formulations for f(R,ϕ,X) gravity with applications to nonminimal derivative coupling and R2-Higgs inflationTwo different dynamical system formulations are presented that can be implemented to analyze a rather large class of modified gravity theories within the generic f(R,ϕ,X) family. As illustrative…Saikat Chakraborty, Sergio E. Jorás, Alberto Saa·Jul 17, 2026SaveLearn
Gravitational waves from parabolic encounters: A study of linear and nonlinear memoryThe memory effect is known to introduce a permanent displacement in the gravitational wave (GW) detectors after the passage of a GW signal. While the linear memory adheres to the source…Samik Dutta, Ankur Chhabra, Aritra Banerjee et al.·Jul 17, 2026SaveLearn
Black hole echos reflect the phase transition and fluctuations in Hawking radiationBlack holes are thermal objects. They can form thermodynamic phases and exhibit phase transitions. Furthermore, black holes can also radiate, termed as Hawking radiation. However, the signatures of…Tianqi Yue, Jin Wang·Jul 17, 2026SaveLearn
An Extended Second Law of ThermodynamicsThe second law of thermodynamics constitutes a fundamental principle of physics, precluding the existence of perpetual motion machines and providing a natural definition of the arrow of time. Its…Alejandro Corichi, Omar Gallegos·Jul 17, 2026SaveLearn
Unitary quantum matter-bounce in a universe with a positive cosmological constantWe analyze the Wheeler-DeWitt quantization of a spatially flat Friedmann-Lemaître-Robertson-Walker universe containing pressureless dust and a positive cosmological constant (Λ> 0). Following…Harkirat Singh Sahota, Dipayan Mukherjee, S. Shankaranarayanan·Jul 17, 2026SaveLearn
Laying the foundation of the effective-one-body waveform models SEOBNRv5: improved accuracy and efficiency for spinning non-precessing binary black holesWe present SEOBNRv5HM, a more accurate and faster inspiral-merger-ringdown gravitational waveform model for quasi-circular, spinning, nonprecessing binary black holes within the effective-one-body…Lorenzo Pompili, Alessandra Buonanno, Héctor Estellés et al.·Jul 17, 2026SaveLearn
On Accretion and Neutrino Investigations of Thermodynamically Reconstructed Black Holes from Three-Parameter Generalized EntropyWe study accretion and neutrino-sensitive thermal signatures of a static black hole reconstructed from a three-parameter generalized entropy. The construction is thermodynamic by design: the entropy…F. Barzi, W. El Hadri, H. El Moumni et al.·Jul 16, 2026SaveLearn