Test-particle dynamics in a noncommutative deformation of Einstein-Rosen wavesWe investigate phenomenological effects induced by a noncommutative deformation of Einstein--Rosen gravitational-waves within the framework of the Riemannian geometry of noncommutative surfaces…Diego Henrique Carvalho dos Santos, José André Lourenço, Davi C. Rodrigues et al.·Jul 27, 2026SaveLearn
The Higgs vacuum in the presence of strong gravitational fields: curvature induced electroweak symmetry restorationI investigate the behaviour of the Higgs field in Schwarzschild spacetime by introducing a Planck-suppressed coupling between the Higgs field and the Kretschmann scalar, the leading curvature…Paul G. Abel·Jul 27, 2026SaveLearn
Entropy dynamics in gravitational collapse: From Minkowski breaking to de Sitter thermodynamicsThe origin of black hole entropy remains one of the deepest mysteries in modern physics. Two recent developments offer complementary perspectives on this puzzle: the entropy release from regular…Francisco S. N. Lobo, Manuel E. Rodrigues·Jul 27, 2026SaveLearn
Multi-gravity cosmology beyond pairwise interactionsWe develop the cosmological framework for Hassan--Schmidt-May multi-gravity, a ghost-free extension of bimetric theory with genuinely non-pairwise interactions of multiple spin-2 fields. For metrics…J. Flinckman·Jul 27, 2026SaveLearn
Modified Mukhanov-Sasaki equation and primordial perturbations in κ-deformed non-commutative space-timeWe study the inflationary primordial perturbations in κ-Minkowski non-commutative space-time, a Lie-algebraic type deformation of canonical space-time motivated by quantum gravity scenarios.…Yang Lei, Vishnu Rajagopal, Puxun Wu·Jul 27, 2026SaveLearn
Exact Analytical Phase Transitions, Horizon Bistability, and Thermodynamic State-Space Representation of Regular Hayward Black HolesWe establish exact analytical thresholds and present a unified thermodynamic state-space representation for the regular Hayward black hole, resolving the full phase structure without reliance on…Jyothipriya M Shaji, Jiswin Varghese, R. Tharanath et al.·Jul 27, 2026SaveLearn
Gravitational wave signatures of magnetized Ernst black holeWe investigate gravitational wave (GW) emission from periodic timelike orbits of a test particle around a magnetized Ernst black hole and the gravitational waveforms generated by their orbital…Fazlay Ahmed, Sanjar Shaymatov, Chengxun Yuan et al.·Jul 27, 2026SaveLearn
Gravitational Wave Signatures of Periodic Orbits around a Schwarzschild-like Black Holes Submerged in an Exponential Density Dark Matter ProfileWe study a Schwarzschild-like black hole embedded in an exponential-sphere (ESM) dark matter halo, characterized by a halo mass M0 and a scale radius r0. We first show that the halo's…Mohammad Reza Alipour, Saeed Noori Gashti, Mohammad Ali S. Afshar et al.·Jul 27, 2026SaveLearn
Landauer's Principle as a Criterion for Thermodynamic Consistency in Generalized Black Hole EntropiesUnder the assumption that black hole horizon area is quantized, each Hawking evaporation step, during which the black hole loses mass and transitions to a lower area level, is interpreted as the…Fatemeh Sadeghi, Ahmad Sheykhi·Jul 27, 2026SaveLearn
Scalar perturbations and strong cosmic censorship in a regular ABGB-de Sitter black hole spacetimeWe investigate the quasinormal modes (QNMs) of scalar perturbations and strong cosmic censorship (SCC) in regular Ayón-Beato-García-Bronnikov-de Sitter (ABGB-dS) black hole spacetime. The main…Hang Liu, Hong Guo·Jul 27, 2026SaveLearn
Gravitational Lensing of Gravitational Waves: Towards a Higher-order Geometric-optics ApproachIn this work, we study the gravitational lensing of gravitational waves (GWs) by extending the geometric-optics approximation to higher order. With the help of the Newman-Penrose formalism, we…Zhao Li, Shaoqi Hou, Wen Zhao·Jul 27, 2026SaveLearn
Perturbations of black holes in mass-varying massive gravityBased on eigendecomposition and matrix perturbation theory, we propose an alternative method for analyzing perturbations in massive gravity that is applicable to both the base theory and its various…De-Jun Wu·Jul 27, 2026SaveLearn
Inflation from Covariant Signature Change: A Geometric MechanismWe present a covariant mechanism in which a smooth change of metric signature, from a Euclidean to a Lorentzian regime, drives a finite interval of accelerated expansion. The transition, encoded by a…Raghvendra Singh, Sergey Bondarenko·Jul 27, 2026SaveLearn
Entanglement and firewalls in quantum circuit model of black hole evaporationWe reexamine the quantum circuit model of black hole evaporation proposed in a previous work (Class. Quantum Grav. 35, 235013, 2018) [1]. This tripartite model incorporates the following systems:…Yi-Chen Lu, Tien Hsieh, Da-Shin Lee·Jul 27, 2026SaveLearn
Hierarchical formulation of the self-gravitating, n-dimensional, charged scalar field in spherical symmetry in affine null formalismWe develop an affine-null characteristic formulation of the Einstein-Maxwell system coupled to a charged complex scalar field in n-dimensional spherical symmetry. By introducing suitable auxiliary…Laura Bridera, Emanuel Gallo, Thomas Mädler·Jul 27, 2026SaveLearn
Critical Behavior of Photon Rings in Kerr-Bertotti-Robinson SpacetimeIn this work, we investigate the critical behavior of photon rings in the Kerr-Bertotti-Robinson spacetime, describing a rotating black hole immersed in a background magnetic field. We analyze the…Xi Wan, Zhenyu Zhang, Fang-Stars Wei et al.·Jul 27, 2026SaveLearn
Spectral Bifurcations in Quasinormal Modes of Regular BTZ Black HolesWe study the quasinormal spectrum of massless scalar fields propagating on a family of regular BTZ black holes arising from an infinite tower of dimensionally regularized Lovelock corrections. These…Kartheek Hegde, Tajron Jurić, A. Naveena Kumara·Jul 27, 2026SaveLearn
Cosmographic Connection Between Cosmological And Planck Scales: The Barrow-Tsallis EntropyOne of the fundamental challenges of quantum gravity is to understand how the microscopic degrees of freedom of the cosmological horizon shape the evolution of the Universe. One possible approach to…Yu. L. Bolotin, V. V. Yanovsky, D. A. Yerokhin·Jul 27, 2026SaveLearn
Systematic biases in parameter estimation on LISA binaries. II. The effect of excluding higher harmonics for spin-aligned, high-mass binariesThe Laser Interferometer Space Antenna (LISA) will observe massive black hole binaries (MBHBs) with astoundingly high signal-to-noise ratio, leaving parameter estimation with these signals…Sophia Yi, Francesco Iacovelli, Emanuele Berti et al.·Jul 27, 2026SaveLearn
δN formalism with gradient interactionsThe standard δN formalism is a cornerstone technique for calculating curvature perturbations on super-Hubble scales. However, its validity relies heavily on the separate universe assumption, in…S. Mohammad Ahmadi, Nahid Ahmadi·Jul 27, 2026SaveLearn
When inflationary perturbations refuse to classicalise: the role of non-Gaussianity in Wigner negativityInflationary perturbations are quantum in origin. Yet, when computing cosmological observables, they are often treated as classical stochastic fields. Do they nevertheless retain quantum birthmarks?…Aurora Ireland, Vincent Vennin·Jul 27, 2026SaveLearn
Galactic dark matter halos: From anisotropic fluids in general relativity to Horava-Lifshitz gravityWe deform the GR Hamiltonian by adding an extra weight +1 density to the potential. We show that potential deformations of this type leave the (reduced) Dirac algebra unchanged and the modification…Paolo M Bassani·Jul 27, 2026SaveLearn
Optical appearance of regularized compact objects without an exterior photon sphereRecent observations by the Event Horizon Telescope (EHT) indicate that the shadow of the compact object at our Galaxy's center (Sgr A*) closely resembles that of a Schwarzschild black hole.…Ashok B. Joshi, Vishva Patel, Parth C. Varasani·Jul 27, 2026SaveLearn
Characteristic Decomposition for Relativistic Numerical Simulations: II. MagnetohydrodynamicsThe characteristic decomposition for GRMHD in the comoving frame of the fluid has been known for a long time. However, it has not been known in the coordinate frame of the simulation and in terms of…Saul A. Teukolsky·Jul 27, 2026SaveLearn
Characteristic Decomposition for Relativistic Numerical Simulations: I. HydrodynamicsThe characteristic decomposition for GRMHD is not known in a form useful for current numerical simulations. This prevents us from using the most accurate known computational methods, such as…Saul A. Teukolsky·Jul 27, 2026SaveLearn