Non-monotonic evolution of multipartite entanglement under the Unruh effectWe investigate the behavior of tetrapartite entanglement in a four-qubit Dicke state under relativistic motion by employing the Unruh-DeWitt detector model, where one detector undergoes uniform…Shu-Min Wu, Si-Han Shang, Si-Yu Liu et al.·May 23, 2026SaveLearn
Imprints of Black Hole Shadows and Polarization Patterns of Various Thick Disks: Bumblebee gravityThe main objective of this study is to explore the shadow and polarization patterns of a Kerr-Sen-like BH induced from Bumblebee gravity, which, among other alternative theories of gravity beyond…Muhammad Israr Aslam, Nazek Alessa, Chen-Yu Yang et al.·May 23, 2026SaveLearn
Astrophysical Objects in Modified Theories of GravityThis thesis investigates compact astrophysical objects within modified theories of gravity, focusing on neutron stars and strange stars. The work studies their internal structure, equilibrium, and…Sneha Pradhan·May 23, 2026SaveLearn
Generalized Mass-to-Horizon Entropy and Horizon ThermodynamicsWe investigate the cosmological implications of generalized mass-to-horizon entropy, a two-parameter extension of the standard Bekenstein entropy based on the mass-to-horizon relation. Assuming the…Smeehan S Shameeem, Priyesh K, Krishna P. B et al.·May 23, 2026SaveLearn
Non-vacuum metrics for the Newman-Unti-Tamburino background: A coordinate-free approach to diverging and twisting solutionsThe geometry of the Newman-Unti-Tamburino (NUT) vacuum solution is characterized as the unique Petrov Type D vacuum metric such that the two double principal null directions form an integrable…Ayşe Hümeyra Bilge, Tolga Birkandan, Tekin Dereli et al.·May 23, 2026SaveLearn
Circularly polarized gravitational waves from parity-violating scalar-tensor theoryWe study both primordial gravitational waves (GWs) and scalar-induced gravitational waves (SIGWs) in a class of the parity-violating scalar-tensor (PVST) theory, of which the Lagrangian is the linear…Jia-Xi Feng, Jia-Yuan Fang, Xian Gao·May 23, 2026SaveLearn
Evolution of Hawking mass under perturbative spacetime uniformly expanding flowsWe present a numerical investigation of the evolution of the Hawking mass for perturbed surfaces evolving under hypersurface-restricted uniformly expanding flows in Minkowski spacetime. Although…Hollis Williams·May 23, 2026SaveLearn
Twisting asymptotically-flat spacetimesWe extend the Bondi formalism to describe asymptotically-flat spacetimes where the outgoing null geodesic congruence is not hypersurface-orthogonal, i.e. has non-vanishing twist. In the…Marc Geiller, Pujian Mao, Antoine Vincenti·May 23, 2026SaveLearn
A Universal Framework for Horizon-Scale Tests of Gravity with Black Hole ShadowsIn this Letter, we have developed a numerically efficient framework for evaluating parameters in metric theories of gravity, and applied it to constrain the horizon-scale magnetic field in the…Wentao Liu, Yang Liu, Di Wu et al.·May 23, 2026SaveLearn
GW250114 reveals black hole horizon signaturesThe horizon of a black hole, the "surface of no return", is characterized by its rotation frequency ΩH and surface gravity κ. A striking signature is that any infalling object appears to…Neil Lu, Sizheng Ma, Ornella J. Piccinni et al.·May 23, 2026SaveLearn
Cosmological Tests of f(R,G,T) Dark Energy Model in FRW UniverseThis research article presents a new cosmological model formulated within the f(R,G,T) framework, focusing on the observational signatures and parameter constraints of the model. The Markov Chain…Himanshu Chaudhary, Amine Bouali, Niyaz Uddin Molla et al.·May 23, 2026SaveLearn
Stress-Energy Tensor for Modified General Relativity with Quantum-Deformed Metric in Riemann SpacetimeThe generalized noncommutative Heisenberg algebra, which is based on the generalized uncertainty principle, imposes a minimal length uncertainty on quantum mechanics (QM), on one hand. On the other…A. Tawfik, Saleh O. Allehabi, A. A. Alshehri et al.·May 22, 2026SaveLearn
Inferring Neutron-Star Properties from Post-merger Gravitational-wave Spectra with Neural NetworksWe present a proof-of-concept study of the inverse problem of inferring neutron-star properties directly from the post-merger gravitational-wave spectrum of equal-mass binary neutron-star mergers.…Dimitrios Pesios, Nikolaos Stergioulas·May 22, 2026SaveLearn
Probing the limits of the semiclassical Einstein equationIn the context of semiclassical gravity, the semiclassical Einstein equation is often invoked when backreaction of quantum matter/fields on the spacetime is at stake. It is expected to hold when…Gustavo Schranck Habermann, Daniel A. Turolla Vanzella·May 22, 2026SaveLearn
Hawking atmosphere of anti-de Sitter black holesThis work investigates the semiclassical evolution of the Hawking atmosphere surrounding evaporating, spherically symmetric anti-de Sitter (adS) black holes. We model the evaporation process within a…A. F. Cardona, C. Molina·May 22, 2026SaveLearn
Natural Metric-Affine Inflation: ReloadedWe revisit natural inflation within the framework of metric-affine gravity, considering the impact of a periodic non-minimal coupling between the inflaton and the Nieh-Yan term. Such a term, alone,…D. Kraiko, A. Racioppi·May 22, 2026SaveLearn
Entropy and stability of an extremally charged Einstein-Born-Infeld thin shellSpacetimes with a thin shell offer a framework where both the dynamical and the thermodynamical stability of the matter comprising the shell can be consistently studied. In the present work, we…Ernesto Eiroa, Griselda Figueroa-Aguirre, Miguel Peñafiel·May 22, 2026SaveLearn
The imprints of the instantaneous appearance of a conformal Killing vector field on the evolution of self-gravitating fluid spheresWe study the influence of the instantaneous appearance of a conformal Killing vector (CKV) in self-gravitating fluid spheres during their evolution. For doing that we introduce a tensor variable…L. Herrera, A. Di Prisco, J. Ospino·May 22, 2026SaveLearn
On the Gravitational Angular Momentum of Axial Perturbations of a Regular Black HoleThis Letter deals with the gravitational angular momentum carried by axial (odd-parity) perturbations of the Bardeen regular black hole within the teleparallel equivalent of general relativity…S. C. Ulhoa, F. L. Carneiro, B. C. C. Carneiro·May 22, 2026SaveLearn
The field-theoretical formalism for TEGRThe teleparallel equivalent of general relativity (TEGR) is represented in a field-theoretical form, where tetrad and matter perturbations are propagated on a background solution of TEGR. Thus, the…E. D. Emtsova, A. N. Petrov·May 22, 2026SaveLearn
General Expressions for Measurable Parameters in Curved SpacetimeGeneral covariant expressions for measurable angles, distances, velocities, and accelerations are provided in terms of fundamental parameters that can be applied in any setup. The relativistic…Dmitri Lebedev, Kayll Lake·May 22, 2026SaveLearn
Greybody Factor, Resonant Frequencies, and Entropy Quantization of Charged Scalar Fields in the Kerr-EMDA Black HoleWe study charged massive scalar field perturbations on the rotating black hole (BH) background of Einstein-Maxwell-Dilaton-Axion (EMDA) theory, known as the Kerr-EMDA BH. Starting from the…Nazım Sertkan, İzzet Sakallı·May 22, 2026SaveLearn
Cosmological coupled black holes immersed in dark sectorMotivated by theoretical and observational developments of cosmological coupled black holes, we construct an exact analytical solution for a black hole immersed in an anisotropic dark sector…Chen-Hao Wu, Yue Chu, Ya-Peng Hu·May 22, 2026SaveLearn
Repetitive Penrose process in Konoplya-Zhidenko rotating non-Kerr black holesThis paper investigates the repetitive Penrose process in Konoplya-Zhidenko rotating non-Kerr black hole, exploring the influence of the deformation parameter on the repetitive Penrose process. After…Xiao-Xiong Zeng, Dong-Ping Su, Ke Wang·May 22, 2026SaveLearn
Grey-body factors of higher dimensional regular black holes in quasi-topological theoriesWe study grey body factors and Hawking radiation of higher dimensional regular black holes arising in quasi topological gravity. These spacetimes incorporate infinite curvature corrections that…Juan Pablo Arbelaez·May 22, 2026SaveLearn