A perturbative geometric approach for photon spheres, massive particle surfaces and black hole shadows with mass variationsThe spacetime behavior at very extreme conditions, such as the regions near a black hole, can be very difficult to modelize. In this work we introduce a new geometric method that allows to calculate…Oscar Lasso Andino, Fernando G. Veloz·May 30, 2026SaveLearn
Constraints and Consistency of Rotating Regular Black Hole ThermodynamicsThe thermodynamics of regular black holes has long suffered from a self-consistency problem: the Hawking temperature derived from the first law disagrees with the geometrically defined one, signaling…Qi-Quan Li, Yu Zhang, Hoernisa Iminniyaz·May 30, 2026SaveLearn
Thermodynamic Phase Transitions and Quantum Entropy Corrections in the Simpson-Visser Regular Black HoleRegular black holes offer a compelling framework to explore the consequences of resolving the central singularity of standard black holes. Using the Simpson-Visser ``black-bounce" geometry as an…Vinayak Joshi, Ashok B. Joshi·May 30, 2026SaveLearn
Well-posed geometric boundary data in General Relativity, II: twisted Dirichlet boundary dataIn this second work in a series, we prove the local-in-time well-posedness of the IBVP for the vacuum Einstein equations in general relativity with twisted Dirichlet boundary conditions on a finite…Zhongshan An, Michael T. Anderson·May 30, 2026SaveLearn
Updated Constraints on Omnipotent Dark Energy: A Comprehensive Analysis with CMB and BAO DataIn this work, we present updated observational constraints on the parameter space of the DMS20 dark energy model, a member of the omnipotent dark energy (ODE) class. Our analysis combines multiple…Enrico Specogna, Shahnawaz A. Adil, Emre Ozulker et al.·May 30, 2026SaveLearn
Signatures of a de Sitter-core black hole in ringing, transmission and optical appearanceWe investigate a static, asymptotically flat black hole whose central region approaches a de Sitter vacuum. The geometry is controlled by the ADM mass M0 and a core scale R, and is generated by…N. Heidari, A. A. Araújo Filho, V. Vertogradov and et al.·May 30, 2026SaveLearn
Constraints on the Phenomenology of Dissipative Cosmological Memory from BAO (BOSS + DESI 2024) and Pantheon+ DataWe propose and test a phenomenological model of ``dissipative memory'' in the gravitational field, where early quantum gravitational processes leave a relic signature in the cosmic expansion…S. M. Ponomarenko·May 29, 2026SaveLearn
Analytical calculation of the observational parameters for tachyon inflationWe investigate the possibility of analytically calculating observational parameters in tachyon inflation cosmology, using the Hubble expansion rate as a function of the tachyon field. First, in light…Marko Stojanovic, Neven Bilić, Goran S. Djordjevic et al.·May 29, 2026SaveLearn
Future global stability of Maxwell-Jüttner equilibria and vacuum for the massless Boltzmann equation on FLRW spacetimesIn this work we study the general relativistic massless Boltzmann equation on Friedmann-Lemaître-Robertson-Walker spacetimes with spatial topology T3 in the linear and decelerated…Robert M. Strain, Martin Taylor, Renato Velozo Ruiz·May 29, 2026SaveLearn
Parametric resonance amplification of gravitational waves in dynamical Chern-Simons gravityWithin the effective field theory of dynamical Chern-Simons (dCS) gravity, we study parametric resonance amplification of gravitational waves driven by an oscillating environmental field coupled to…Han-Wen Hu, Chen Lan, Zong-Kuan Guo·May 29, 2026SaveLearn
Stability and instability of torus-symmetric Einstein spacetimes with square-integrable connectionWe study the global evolution problem for the Einstein equations under T2 symmetry on T3, allowing vacuum, scalar-field, and compressible-fluid matter models, governed by a general equation of state…Bruno Le Floch, Philippe G. LeFloch·May 29, 2026SaveLearn
Classical Corrections to Black Hole Entropy IIWe reconsider the classical one bit absorption model of black hole growth as a discrete recursion rather than a continuum equation. In this paper, one bit means one elementary absorption unit…Daulet Berkimbayev, Martin Blaschke·May 29, 2026SaveLearn
Dirac-Field Black Hole Entropy in \(f(Q)\) Gravity from the RVB Residue MethodWe compute the entropy of a Dirac quantum field near a static, spherically symmetric black hole in (f(Q)) gravity by combining the residue-based Robson--Villari--Biancalana method with the thin-film…Wen-Xiang Chen·May 29, 2026SaveLearn
Continuous Bogoliubov formalism for gravitational-wave generation in a unified dark sector warm inflationIn this work, we review gravitational-wave generation in a two-scalar-field cosmological model. The framework relies on a two-field scenario in which warm inflation is unified with the dark sector…Tommaso Mengoni·May 29, 2026SaveLearn
5D black holes and mirror (topological) stars from nonlinear electrodynamics: Existence and stabilityWe consider static, spherically symmetric solutions of 5D general relativity with magnetic fields governed by nonlinear electrodynamics (NED) with the Lagrangian L( F), $ F = FAB…Kirill A. Bronnikov, Sergei V. Bolokhov, Milena V. Skvortsova·May 29, 2026SaveLearn
Non-minimally coupled loop quantum inflation with inverse-volume correctionsWe study slow-roll inflation driven by a scalar field non-minimally coupled to gravity within the effective framework of Loop Quantum Cosmology (LQC), including inverse-volume corrections. We…Rudranil Roy, Giovanni Otalora, Joel Saavedra et al.·May 29, 2026SaveLearn
Ergodic Hysteresis of the Kerr black hole spectrumWe uncover a cascade of exceptional points (EPs) in the quasinormal mode spectrum of massive scalar perturbations of Kerr black holes, revealing an intricate non-Hermitian structure underlying their…João Paulo Cavalcante, Maurício Richartz, Bruno Carneiro da Cunha·May 29, 2026SaveLearn
Graybody factors and absorption cross-sections of non-exchange black holes in Instein-coupled scalar fieldsThis paper studies scalar field perturbations coupled with Einstein tensors of non-exchange black holes. We use the polarization method to calculate graybody factors and absorption cross-sections…Sihao Fan, Wenjun Guo, Chen Wu·May 29, 2026SaveLearn
Topological Thermodynamics of Black Holes: Revisiting the methods of winding numbers calculationIn this paper, the equivalence between two methods for computing winding numbers is established: the approach of ϕ-mapping topological current and the residue method. The methods are shown to be…A. A. M. Silva, G. Alencar, C. R. Muniz et al.·May 29, 2026SaveLearn
Strong deflection limit analysis of black hole lensing in inhomogeneous plasmaThis paper investigates gravitational lensing effects in the presence of plasma in the strong deflection limit, which corresponds to light rays circling around a compact object and forming…Fabiano Feleppa, Valerio Bozza, Oleg Yu. Tsupko·May 29, 2026SaveLearn
Black hole evolutions: Lessons from bifurcation theoryWe explore the role of the stability operator in regulating the evolution of marginally outer trapped surfaces (MOTSs). In 2005, Andersson, Mars and Simon showed that if the stability operator is…Ivan Booth, Graham Cox, Chiamaka Mary Okpala·May 28, 2026SaveLearn
Cosmological accretion onto braneworld black holes: a relativistic treatmentHigher-dimensional black holes have been extensively studied over the years, primarily from heuristic and fundamental perspectives or within the context of holographic applications. However, their…Itzi Aldecoa-Tamayo, Christian T. Byrnes, David Seery·May 28, 2026SaveLearn
Exact Mass Conservation in Binary Neutron Star Merger SimulationsA long-standing problem in the simulation of neutron star spacetimes is the treatment of vacuum regions outside the stars. The use of an artificial low-density atmosphere is a common robust approach…Boris Daszuta, Sebastiano Bernuzzi, Joan Fontbuté et al.·May 28, 2026SaveLearn
Toward a Phenomenologically Acceptable Quantum Cyclic UniverseWe put forward a quantum model of cosmology that is exactly periodic but avoids the Boltzmann Brain problem. If the universe is described by a quantum state evolving unitarily in a finite-dimensional…Sean M. Carroll, Nadiia Diachenko, Saakshi Dulani·May 28, 2026SaveLearn
Dark Energy Stars in Finch-Skea Spacetime with a Schwarzschild-(Anti)-de Sitter ExteriorIn this work, the effects of the cosmological constant on dark energy stars in Finch-Skea spacetime are systematically investigated within the framework of Einstein gravity. A static and anisotropic…Muhamad Ashraf Azman·May 28, 2026SaveLearn