Cosmic structure formation in massive conformal gravityWe study the evolution of cosmological density perturbations in massive conformal gravity (MCG). We show that conformal fermionic matter alone does not generate growing density perturbations in the…F. F. Faria, G. S. Silva·Jul 9, 2026SaveLearn
Traversable Wormholes in the Conservative f (R, T ) GravityWe present a wormhole construction in the framework of the f(R,T) extended gravity theory, with R being the Ricci curvature scalar and T the trace of the energy-momentum tensor, in the case in…Marcelo Montenegro Lapola, Seetesh Prande·Jul 9, 2026SaveLearn
Novel Kerr-Hernquist Black Hole: Quasibound State, Scalar Cloud, Bomb, Superradiant ScatteringWe present a novel rotating black hole solution surrounded by a Hernquist dark matter halo, obtained by applying the Newman--Janis algorithm to the exact Schwarzschild--Hernquist spacetime. The…David Senjaya·Jul 8, 2026SaveLearn
Wave and particle probes of a regular T-duality-inspired black hole with gravitational self-energyRecently it was shown that a non-local T-duality-inspired smearing of the point mass introduces a finite zero-point length, while the regularized Newtonian gravitational self-energy is promoted to an…Alexey Dubinsky·Jul 8, 2026SaveLearn
Nonlinear hydrodynamics in spinning neutron stars: Theoretical universal relations and equilibrium solutionsWe study tides during the inspiral of a binary neutron star system, including nonlinear hydrodynamical interactions. Using an affine approximation that treats the perturbed neutron star (NS) as an…Hang Yu, Giorgio Nicolini, Shu Yan Lau et al.·Jul 8, 2026SaveLearn
Finite mass two throat wormholes: global light rings, branch resolved strong lensing, and scalar transmissionWe introduce a static, horizonless, asymptotically flat two throat wormhole family in which one global metric determines the geometry, effective source, null dynamics, lensing, and test field…Anirudh Pradhan, K. Ghaderi, M. Zeyauddin et al.·Jul 8, 2026SaveLearn
Charging up regular black holesWe present a general construction of charged regular black holes as solutions of a generalization of the Einstein--Maxwell field equations in spherical symmetry in which the Einstein tensor is…Raúl Carballo-Rubio, Chiara Coviello, Vania Vellucci·Jul 8, 2026SaveLearn
Singularity resolution and unitarity in two-dimensional dilaton black holes with negative central chargeWe study a one-loop corrected extension of the classical Callan-Giddings-Harvey-Strominger (CGHS) model of two-dimensional dilaton gravity. The effective action combines the non-local Polyakov action…César García-Pérez, F. Javier Marañón-González, José Navarro-Salas et al.·Jul 8, 2026SaveLearn
Regular Black Holes in Nonlocal Quasitopological GravityWe present infinite-derivative completions of Quasitopological gravities that are ghost-free, avoid strong coupling instabilities and admit exact, spherically symmetric vacuum regular-black-hole…Pablo Bueno, Pablo A. Cano, Robie A. Hennigar et al.·Jul 8, 2026SaveLearn
Observational Limits on Einasto Dark Matter Parameters from Event Horizon Telescope Images of Sgr A* and M87*The Event Horizon Telescope (EHT) has provided images of the supermassive black-holes Sgr A* and M87*, enabling direct tests of gravity. Any extended mass-distribution, such as a…A. Errehymy, S. Hansraj, C. Hansraj·Jul 8, 2026SaveLearn
Systematic Light Propagation Bias from the Heliosphere and Its Impact on the Hubble TensionThe Hubble tension (HT) represents one of the most significant discrepancies in modern cosmology, with local distance measurements yielding H0 = 73.5 1.4 km/s/Mpc while cosmic microwave…Behnam Pourhassan, İzzet Sakallı, Sudhaker Upadhyay et al.·Jul 8, 2026SaveLearn
When one sign is not enough: 2+1 circular motion Unruh effect at low energiesWe address the circular motion Unruh effect in 2+1 spacetime dimensions, as probed by a pointlike Unruh-DeWitt detector coupled to a massless scalar field. The effective temperature due to circular…Leo J. A. Parry, Christopher J. Fewster, Jorma Louko·Jul 8, 2026SaveLearn
On relativistic observables in black bounce spacetimesWe investigate the phenomenology of black bounce spacetimes through a combined analytical and numerical study of relativistic observables associated with both time-like and null geodesics. Black…Víctor Ovejero-Bermúdez, Álvaro de la Cruz-Dombriz, Riccardo Della Monica·Jul 8, 2026SaveLearn
Vacuum polarization and renormalized stress-energy tensor of spherical thin shellsWe provide a thorough study of the properties of the Boulware vacuum in the spacetime of a spherical, static thin shell with a Minkowski interior. To this end, we calculate the renormalized vacuum…Julio Arrechea, Cormac Breen, Adrian Ottewill et al.·Jul 8, 2026SaveLearn
Light bending around the Kerr-Bertotti-Robinson black hole using material medium approachIn this paper, we study the deflection of massless particles due to a rotating, axially symmetric Kerr-Bertotti-Robinson (KBR) black hole via; material medium approach. We explored the effect of…Saswati Roy, Anshul Tapase, Shubham Kala et al.·Jul 8, 2026SaveLearn
Neural-Spectral Discovery of Rotating Black Holes Beyond General RelativityFinding rotating black hole solutions in higher-curvature theories of gravity is a problem of fundamental importance. Virtually every approach to reconcile gravity with quantum mechanics predicts…Felipe Agurto-Sepúlveda, Marcelo Oyarzo, Anxo Biasi et al.·Jul 8, 2026SaveLearn
Impact of H0 on gravitational wave propagation: prospects for the LISA missionIt was previously shown that H0 influences gravitational wave propagation beyond simple redshift, by modifying the effective wavenumber. While earlier studies focused on Pulsar Timing Arrays, we…Nil Blanco, Domenec Espriu·Jul 8, 2026SaveLearn
Hierarchy of Angular Instabilities in Scalarized Black HolesWe investigate the stability of scalarized black holes in Einstein-scalar-Gauss-Bonnet-Ricci theory along their fundamental branches. We show that initially stable solutions first lose nonspherical…Jose Luis Blázquez-Salcedo, Luis Manuel González-Romero, Fech Scen Khoo et al.·Jul 8, 2026SaveLearn
Naked Singularities beyond Spherical Symmetry: Singular Inner Cauchy Horizons for the Einstein-Scalar Field SystemIn this work, we investigate the formation of naked singularities for the 3+1-dimensional Einstein-scalar field system without symmetry assumptions. We generalize the spherically symmetric and…Xinliang An, Shengrong Wu·Jul 8, 2026SaveLearn
Testing General Relativity with GWTC-4.0 through mixture modelsGravitational-wave observations of compact binary mergers have enabled precision tests of gravity in the strong-field dynamical regime. Current approaches combine single-event results that assume…Koustav Chandra, Juan Calderón Bustillo·Jul 8, 2026SaveLearn
The twin paradox in the vicinity of rotating black holesThe twin paradox is a foundational thought experiment in the special theory of relativity where a returning twin ages less than the one who remains stationary. However, the intricacies of the twin…Shuiquan Bai, Geraint F. Lewis·Jul 8, 2026SaveLearn
Primordial black hole in Lorentz-violating theories: Insights from Bumblebee gravityThe Bumblebee gravity (BG) model, featuring spontaneous Lorentz symmetry breaking via a vector field non-minimally coupled to curvature, has been widely used to explore Lorentz-violating effects in…Mohsen Khodadi, Javad T. Firouzjaee·Jul 8, 2026SaveLearn
Slowly rotating condensate dark stars beyond the mean-field approximationWe investigate rotational properties and universal relations of slowly rotating Bose-Einstein condensate dark stars in the context of General Relativity, both at the mean-field level and when the…Grigoris Panotopoulos, Ángel Rincón, Ilidio Lopes·Jul 8, 2026SaveLearn
Beyond the Bounce: Multiple Tidal Sign Reversals and Turning-Point Bifurcations in Multi-Horizon Black HolesWe investigate the radial motion and tidal forces experienced by neutral test particles in multi-horizon black hole solutions arising from Einstein gravity coupled to nonlinear electrodynamics (NED).…Mohammad Ali S. Afshar, J. Sadeghi·Jul 8, 2026SaveLearn
Periodic Timelike Motion and Gravitational Wave Signatures around a Magnetically Charged Black Hole Surrounded by QuintessenceWe investigate timelike geodesics and gravitational wave signatures of periodic motion around a static magnetically charged black hole arising from nonlinear electrodynamics and immersed in a…R. H. Ali·Jul 8, 2026SaveLearn