Local Expansion Mechanisms for Quantum-Scale WormholesQuantum models of spacetime have been conjectured to hypothetically allow for the formation of Planck scale wormholes. Building on the proposal of Morris, Thorne, and Yurtsever that such microscopic…Philipp Dorau, Albert Much·May 27, 2026SaveLearn
Emergent Gravity from Topological Quantum Field Theory: Stochastic Gradient Flow Perspective away from the Quantum Gravity ProblemWe propose a scenario according to which the ultraviolet completion of General Relativity is realized through a stochastic gradient flow towards a topological BF theory. Specifically, we consider the…Andrea Addazi, Salvatore Capozziello, Jinglong Liu et al.·May 27, 2026SaveLearn
Effective chemical potential and its phenomenological implications for the Hubble parameterIn cosmological models, the Hubble parameter is determined by the time evolution of the scale factor, and current observations reveal a persistent tension between its values inferred from different…L. L. Sales, F. C. Carvalho·May 26, 2026SaveLearn
Reconstructing ACT-compatible and GW170817-compatible Einstein-Gauss-Bonnet Inflation from the Observational IndicesIn this work we use an inverse reconstruction technique for constructing ACT-compatible and GW170817-compatible Einstein-Gauss-Bonnet inflationary theories. From a given tensor-to-scalar ratio using…V. K. Oikonomou·May 26, 2026SaveLearn
Lorentz-Violating (Regular) Black Holes in Einstein GravityWe introduce a minimally coupled dark sector based on a nonlinear electrodynamics to generate regular spacetime textures that interpolate from a regular core to an asymptotic Lorentz-violating…Zhi-Chao Li, H. Lu·May 26, 2026SaveLearn
Charting causal set configuration space with graph observablesThe configuration space of causal sets is vast. It is a critical goal to map out this space. Here, we take a practical step towards this goal. We investigate nine classes of causal sets, most of them…Astrid Eichhorn, Harald Mack, Kim Tuyen Le et al.·May 26, 2026SaveLearn
A no-go study on gravitational helicity in connection variablesWe study the gravitational helicity using the covariant phase space method. Starting from the covariant phase space of general relativity expressed in terms of connection variables, we construct the…Xiao-Kan Guo, Shupeng Song·May 26, 2026SaveLearn
Reconstructing the cosmic expansion in f(R, Lm) gravity via parametrized Hubble function constraintsWe probe the cosmic expansion scenario within the framework of f(R, Lm) gravity by employing a well-motivated functional form of f(R, Lm) = R2 + Lmλ. Specifically, we introduce…Khomesh R. Patle, G. P. Singh·May 26, 2026SaveLearn
Strong-lensing degeneracies of black holes embedded in self-interacting scalar field dark matter halosIn this paper, we explore the strong gravitational lensing properties of black holes embedded in self-interacting scalar field dark matter halos, together with NFW-type configurations for comparison.…Mohsen Fathi, Gabriel Gómez·May 26, 2026SaveLearn
Hybrid Expansion Cosmology in f(T) Gravity: Late-Time Evolution and Observational BoundsThis study investigates the cosmological dynamics of an accelerating universe within the framework of teleparallel gravity using an exponential f(T) functional form. To obtain exact cosmological…Rajalakshmi Jena, Vishal M C, Sankarsan Tarai·May 26, 2026SaveLearn
Diffeomorphism-Like Symmetry in GravitoelectromagnetismGravitoelectromagnetism in the Weyl formalism is investigated through an analysis of the consequences of a restricted gauge symmetry acting on the tensor field Aμν. The propagator associated…L. A. S. Evangelista, A. F. Santos·May 26, 2026SaveLearn
Are Petrov type-N and D spacetimes admitting CTCs valid in f(R,Lm,Φ,X) gravity?We ask whether two classical time-machine geometries, the Ori (2005) compact-vacuum-core metric and the Ahmed (2018) four-dimensional generalisation of Misner space, remain admissible exact solutions…Faizuddin Ahmed, Ahmad Al-Badawi, İzzet Sakallı·May 26, 2026SaveLearn
The Stability of Minkowski SpacetimeThe nonlinear stability of Minkowski spacetime has been one of the central achievements in the mathematical theory of general relativity and, more broadly, in the analysis of nonlinear geometric wave…Dawei Shen·May 26, 2026SaveLearn
Probing Spacetime Topology and Superposition with Accelerated DetectorsWe study entanglement harvested by Unruh DeWitt detectors following Rindler trajectories in compactified and superposed Minkowski spacetime. We consider different directions of acceleration (both…P. Poopathysankar, Lucas Hackl, Anwesha Chakraborty·May 26, 2026SaveLearn
Universal Thermodynamic Topological Classes of BTZ Black Holes in Einstein and F(R) GravityIn this paper, we systematically study three classes of three-dimensional Bañados-Teitelboim-Zanelli (BTZ) black holes based on different gravitational frameworks and matter field structures: the…Yu-Die Wan, Peng Zhao, Meng-Yao Zhang et al.·May 26, 2026SaveLearn
Dynamics of Binary System around a Supermassive Black Hole :Binary Scattering and Eccentric vZLK OscillationsWe study the dynamics of a binary orbiting a supermassive black hole (SMBH), focusing on both binary scattering in unbound orbits and eccentric von Zeipel-Lidov-Kozai (vZLK) oscillations in bound…Kei-ichi Maeda, Hirotada Okawa·May 26, 2026SaveLearn
Dymnikova Black Holes in Unimodular Gravity: Maxwell Sources and Vacuum ContributionsIn this work, we investigate the Dymnikova regular black hole within the framework of unimodular gravity, emphasizing the role of the effective vacuum sector in the regularization of the geometry. By…G. Alencar, V. H. U. Borralho·May 26, 2026SaveLearn
Canonical Vielbeins for General Relativity: D + 1 Decomposition and Constraint AnalysisWe provide a self-contained derivation of the Hamiltonian formulation of General Relativity in vielbein variables in d=D+1 dimensions. Starting from the Einstein--Hilbert action in a standard…Joakim Flinckman, Daniel Blixt·May 26, 2026SaveLearn
Resummed energy loss in extreme-mass-ratio scattering using critical orbitsMotivated by recent efforts to bridge between weak-field and strong-field descriptions of black-hole binary dynamics, we develop a resummation scheme for post-Minkowskian radiative observables in…Leor Barack, Riccardo Gonzo, Benjamin Leather et al.·May 26, 2026SaveLearn
Jacobson's thermodynamic approach to classical gravity applied to non-Riemannian geometries: remarks on the simplicity of NatureThree decades ago, Ted Jacobson surprised us with a very appealing approach to classical gravity. According to him, the gravitational field equations are the consequence of the first law of…Jhan N. Martinez, Jose F. Rodriguez-Ruiz, Yeinzon Rodriguez·May 26, 2026SaveLearn
Numerical simulations of primordial black hole formation via delayed first-order phase transitionsWe perform fully nonlinear, spherically symmetric numerical simulations of superhorizon false-vacuum-domain (FVD) collapse in a coupled gravity-scalar-fluid system to study primordial black hole…Zhuan Ning, Xiang-Xi Zeng, Rong-Gen Cai et al.·May 26, 2026SaveLearn
Renormalisation Group approach to General RelativityThe detection of gravitational waves has intensified the need for efficient, high-precision modeling of the two-body problem in General Relativity. Current analytical methods, primarily the…F. Gutiérrez, K. Falls, A. Codello·May 26, 2026SaveLearn
Effects of the ekpyrotic mechanism on inflationary phase in loop quantum cosmologiesIn bouncing cosmological models, either classical or quantum, the big bang singularity is replaced by a regular bounce. A challenging question in such models is how to keep the shear under control in…Christian Brown, Jared Fier, Brian Phillips et al.·May 26, 2026SaveLearn
Comparing a Compact-Binary Mass-Shell Model with Select Observed Gravitational WavesIn a recent work, coalescing compact binaries (CCBs) were modeled as a rotating and contracting compact mass shell, providing an alternative effective representation to the state-of-the-art…Noah M. MacKay·May 26, 2026SaveLearn
GRTresna: An open-source code to solve the initial data constraints in numerical relativityGRTresna is a multigrid solver designed to solve the constraint equations for the initial data required in numerical relativity simulations. In particular, it is focussed on scenarios with…Josu C. Aurrekoetxea, Sam E. Brady, Llibert Aresté-Saló et al.·May 26, 2026SaveLearn