Gauge-Unfixed Hamiltonian Casimir and Static Torsionful Sector in the Katanaev-Volovich ModelHamiltonian analysis of the first-order Katanaev-Volovich model of two-dimensional gravity with torsion. The first-order action already singles out natural canonical pairs: the auxiliary Lorentz…J. Manuel-Cabrera, J. M. Paulin-Fuentes·Jul 16, 2026SaveLearn
Schwarzschild-like Black Holes Submerged in an Exponential Density Dark Matter ProfileWe study a class of Schwarzschild black holes embedded in an exponential-spheroidal dark matter halo, modelled by a phenomenological density profile ρ(r)=ρ0 e-r/r0. By solving the Einstein…Kuantay Boshkayev, Yassine Sekhmani, Soroush Zare et al.·Jul 16, 2026SaveLearn
Quasinormal Modes of Self-Dual Loop Quantum Gravity Corrected Kerr Black HolesWe investigate scalar quasinormal modes and ringdown signals of a rotating loop quantum gravity black hole constructed via the revised Newman--Janis algorithm. The spacetime incorporates two quantum…Yu Wang, Meilin Liu, Haiguang Xu·Jul 16, 2026SaveLearn
Nonlinear Gravitational Wave Interactions in an Expanding UniverseThis study explores the nonlinear interactions between gravitational waves in an expanding universe. Random ensembles of gravitational waves are evolved numerically in cosmological models whose…Fan Zhang, Lee Lindblom, Zhi-Peng Peng·Jul 16, 2026SaveLearn
Noncommutative black holes: Topological bulk-boundary correspondence and Binary Merger BoundsWe investigate the thermodynamic topology of charged AdS black holes in a non-commutative spacetime sourced by Lorentzian-smeared matter distributions. Since exact analytical solutions for the…Ankit Anand, Anshul Mishra, Aditya Singh et al.·Jul 16, 2026SaveLearn
Comment on "Non-linear interactions in cosmologies with energy exchange"This work provides a critical reassessment of the cosmological models presented in the article "Non-linear interactions in cosmologies with energy exchange" Eur. Phys. J. C 80, 120 (2020)…Naman Soni·Jul 16, 2026SaveLearn
Kerr black holes without primary hairsWe present a class of regular axisymmetric black hole geometries fully characterized by the parameters \ M,a\ and possessing the Kerr event horizon. This family interpolates between regular…J Ovalle·Jul 16, 2026SaveLearn
Chaos bound violation by spinning particles in Gauss-Bonnet-AdS black holesIn this work, we investigate the violation of the chaos bound for spinning test particles in Gauss-Bonnet anti-de Sitter spacetime, focusing on the regulatory roles of the Gauss-Bonnet parameter and…Xiaowei Li, Mengxuan Wu, Guoping Li·Jul 16, 2026SaveLearn
The radial action for massive particles in spherically symmetric geometries: Exact resummation at any PM orderWe compute the massive particles radial action along hyperboliclike geodesics in various spherically symmetric spacetimes: the standard 4d Schwarzschild spacetime, its d-dimensional genralization…Donato Bini, Giorgio Di Russo·Jul 16, 2026SaveLearn
Orbital Dynamics and Gravitational-Wave Signatures of EMRIs in Self-Dual Loop Quantum Gravity Black HolesLoop quantum gravity (LQG) predicts quantum modifications to classical black-hole spacetimes, which may leave imprints on the dynamics and gravitational-wave signals of compact objects in the…Yu Wang, Meilin Liu, Haiguang Xu·Jul 16, 2026SaveLearn
Warped Spacelike Singularities and the C0-Inextendibility of Birmingham-Kottler SpacetimesWe establish a local obstruction to continuous Lorentzian extensions at a class of warped spacelike singularities. The criterion is expressed through two integrability conditions, a monotonicity…Bobby EkaGunara·Jul 16, 2026SaveLearn
Random walks around black holes and low-frequency X-ray variabilityThe stochastic dynamics of a grain embedded within a turbulent fluid subject to strong gravitational fields can be formulated as a random walk on a Riemannian manifold. Such curvature-weighted walks…Arthur G. Suvorov·Jul 16, 2026SaveLearn
Scalarization of Charged Black Hole in Gauss-Bonnet Extended Starobinsky-Maxwell GravityWe re-examine spontaneous scalarization of black holes within Starobinsky gravity supplemented by the Gauss-Bonnet invariant. A novel feature is uncovered: scalarized solutions split into two smooth…Rui-Xi Zhu, Hai-Shan Liu·Jul 16, 2026SaveLearn
Periodic line-of-sight velocity-driven modulations to gravitational waves emitted by compact binaries in Keplerian outer orbitsThe centre of mass (CoM) of compact binary coalescences (CBCs) occurring in the vicinity of a supermassive black hole, through interaction with an arbitrary third body (e.g., of stellar mass), or in…Avinash Tiwari, Shasvath J. Kapadia, Aditya Vijaykumar et al.·Jul 16, 2026SaveLearn
5d Schwarzschild-Tangherlini spacetime: MST-like formalism for a Reduced Confluent Heun EquationWe study the five-dimensional Schwarzschild-Tangherlini solution, with particular attention to its geodesic structure and massless scalar perturbations. In the probe limit, we present two…Donato Bini, Giorgio Di Russo, Veronica Fantini·Jul 16, 2026SaveLearn
Modified Cosmology from Mass-to-Horizon Relation: Background EvolutionWe investigate the cosmological implications of the mass-to-horizon relation, which provides a unified framework for thermodynamically consistent generalized horizon-entropy functionals. Using the…Pranav Prasanthan, Hussain Gohar, Vincenzo Salzano·Jul 16, 2026SaveLearn
Ray tracing ultracompact boson stars: visibility modulations and incomplete photon ringsModified black holes and black hole mimickers can give rise to additional photon rings in ray-traced images. With the photon ring structure of Kerr well understood, the question arises how well…Seppe J. Staelens, Ece Alkan·Jul 16, 2026SaveLearn
Physical nonviability of f(Q) in the scalar-tensor representationWe show the known pathological character of f(Q) gravity in its scalar-tensor representation.Jose Beltrán Jiménez, Alejandro Jiménez Cano, Tomi S. Koivisto·Jul 16, 2026SaveLearn
Bounds on the radius of outermost photon sphere and black hole shadow in n-dimensional Einstein gravityThe photon sphere, which determines the contour of the black hole shadow, provides a direct probe of strong-field gravity. In this work, we derive model-independent bounds on both the outermost…Jiaqi Fu, Yong Song·Jul 16, 2026SaveLearn
Newtonian Shirokov Effect: Epicyclic Frequency Splitting from Mass MultipolesWe analyze small oscillations of nearly circular orbits in an axisymmetric Newtonian potential expanded in mass multipoles, as the classical counterpart of the relativistic Shirokov effect. Computing…Anuar Idrissov, Kuantay Boshkayev, Abylaikhan Tlemissov et al.·Jul 16, 2026SaveLearn
Extended parameterized spin expansion formalism for ringdown analysis with GW250114Parameterized descriptions of black-hole quasinormal-mode spectra are essential for testing gravity with ringdown observations. We extend the Parameterized Spin Expansion Coefficients (ParSpec)…Jia-Ning Chen, Liang-Bi Wu, Zong-Kuan Guo·Jul 16, 2026SaveLearn
Traversable Wormholes with Non-Exotic Matter: The Role of Higher Curvature CorrectionsIn this paper, we explore wormhole solutions in a higher-derivative theory of gravity where the action depends not only on the Ricci scalar R, but also on its d'Alembertian, R. Such…M Daniel Ranjan, Soumya Chakrabarti, Sanjit Das·Jul 16, 2026SaveLearn
Birkhoff rigidity from a covariant optical seedWe present a local seed-to--Kerr--Schild route to Birkhoff rigidity in four-dimensional spherical vacuum gravity. On the two-dimensional orbit space, the areal radius r determines a scalar…D. A. Easson·Jul 16, 2026SaveLearn
Two shadows of a single black hole: Vacuum birefringence phenomena within Einstein-nonlinear-electrodynamicsOne of the main features of nonlinear electrodynamics is the existence of an effective geometry that describes the geodesic motion of photons. A detailed analysis of the properties of effective…Marco A. A. de Paula, Haroldo C. D. Lima, Pedro V. P. Cunha et al.·Jul 16, 2026SaveLearn
Frozen Motion: Why Single Carrollian Scalars Cannot PropagateWe investigate a class of first-order scalar field theories minimally coupled to a Carrollian connection that are defined intrinsically on the Carrollian plane, i.e., the theories are not defined via…Andrew James Bruce·Jul 16, 2026SaveLearn