Partial Orderings of Curvature InvariantsWe establish a new set of pointwise inequalities that order curvature invariants across various Petrov and Segre types of spacetimes. In arbitrary spacetime dimension, we systematically analyze…Ivica Smolić·Jul 14, 2026SaveLearn
Universality of the Blandford-Znajek emission in stationary and axisymmetric spacetimesThe Blandford-Znajek (BZ) mechanism is widely recognised as the most compelling process to extract rotational energy from an accreting black hole and power the emission of relativistic jets. We…Filippo Camilloni, Luciano Rezzolla·Jul 14, 2026SaveLearn
Violation of the Leggett-Garg inequality in photon-graviton conversionThe Leggett-Garg inequality (LGI) is a temporal analogue of Bell's inequality and provides a quantitative test of the nonclassicality of a system through its violation. We analytically…Kimihiro Nomura, Akira Taniguchi, Kazushige Ueda·Jul 14, 2026SaveLearn
Fermi Acceleration Mechanisms Beyond Lorentz SymmetryWe construct models for first- and second-order Fermi acceleration of particles, incorporating generic frame transformations, dispersion relations, and conservation laws. Within this framework, we…Gilson A. Ferreira, Erick Aguiar, A. A. Araújo Filho et al.·Jul 14, 2026SaveLearn
Parity violating spectral dynamics of black holes in dynamical Chern-Simons gravityWe study how environmentally driven spectral instabilities of quasinormal modes respond to parity violating gravito-scalar coupling in black holes. Focusing on dynamical Chern-Simons gravity as a…Han-Wen Hu, Chen Lan, Zong-Kuan Guo·Jul 14, 2026SaveLearn
Gravitational lensing of gravitational waves: universal characteristics of strongly lensed memory waveformsIn this work, the strong lensing effect of the memory signal was considered. In the geometric optics limit, the lensed memory signal becomes oscillatory, while the unlensed is basically monotonic.…Ruanjing Zhang, Zhi-Chao Zhao, Shaoqi Hou et al.·Jul 14, 2026SaveLearn
When vacuum breaks: a self-consistency test for astrophysical environments in extreme mass ratio inspiralsGravitational-wave signals are typically interpreted under the vacuum hypothesis, i.e. assuming negligible influence from the astrophysical environment. This assumption is expected to break down for…Lorenzo Copparoni, Rohit S. Chandramouli, Enrico Barausse·Jul 14, 2026SaveLearn
Polymer Bianchi-I with polymer matterWe analyze the effective dynamics of a polymer quantized Bianchi-I universe coupled to a polymer quantized scalar field, with a pressureless dust field acting as an internal clock. We show that for a…Aleena Zulfiqar, Syed Moeez Hassan·Jul 14, 2026SaveLearn
Well-posedness of Ricci Flow in Lorentzian Spacetime and its Entropy FormulaThis paper attempts to construct monotonic entropy functionals for four-dimensional Lorentzian spacetime under physical boundary conditions, as an extension of Perelman's monotonic entropy…M. J. Luo·Jul 14, 2026SaveLearn
Inflationary Decoherence from the Gravitational FloorWe re-examine the decoherence rate of primordial fluctuations within minimal inflationary models, using only the gravitational interactions required for the underlying fluctuation-generation…C. P. Burgess, R. Holman, Greg Kaplanek·Jul 14, 2026SaveLearn
A discussion on the symmetry of relativistic Vlasov gas and its accretion in Kerr-Newman black holeWe investigate the kinetic properties of collisionless Vlasov gas in Kerr-Newman spacetime, analyzing how spacetime symmetries constrain the distribution functions. The distribution function is shown…Yongqiang Liu·Jul 14, 2026SaveLearn
Revisiting light propagation over (loop) quantum UniverseWe investigate the propagation of electromagnetic waves over a quantum cosmological background, aiming to uncover potential signatures of quantum gravity through modifications to the dynamics of the…Aliasghar Parvizi, Tomasz Pawłowski·Jul 14, 2026SaveLearn
High-order gravitational late-time tails in Kerr spacetimeWe calculate high-order late-time tails of the retarded Green function of the Teukolsky equation for linear field perturbations of (subextremal) Kerr spacetime. We calculate these tails at a fixed…Marc Casals, Chris Kavanagh, Jakob Neef et al.·Jul 13, 2026SaveLearn
No persuasive evidence yet of gravitational-wave tails from perturbers along the line of sight in LVK observationsObservations of compact binary coalescences (CBCs) by the LIGO-Virgo-KAGRA collaboration resulted in 90 events in the first three observing runs. We search the data near the loudest of these…Kuba Kopczuk, Ethan Blake, Matthew F. Carney et al.·Jul 13, 2026SaveLearn
Spinning particle dynamics, epicyclic frequencies, and transient QPO signatures in Schwarzschild spacetimeWe study the motion of spinning test particles in Schwarzschild spacetime within the Mathisson--Papapetrou--Dixon pole--dipole approximation, imposing the Tulczyjew--Dixon spin supplementary…Uktamjon Uktamov, Ali Övgün, Reggie C. Pantig et al.·Jul 13, 2026SaveLearn
A new non-commutative correction to the thermodynamics and evaporation of the Schwarzschild black hole in non-commutative gauge theoryWe investigate the modified thermodynamic properties of a deformed Schwarzschild black hole arising from new noncommutative corrections to the tetrad fields obtained through the Seiberg-Witten map.…Slimane Zaim, Fatma Zohra Bara·Jul 13, 2026SaveLearn
Geometric effects of torsion on black hole ringdown and shadows in Poincaré gauge gravitySpacetime torsion provides a natural extension of general relativity and may lead to black hole solutions that differ significantly from their Einsteinian counterparts. We investigate a class of…Terkaa Victor Targema, Kazuharu Bamba, Riasat Ali et al.·Jul 13, 2026SaveLearn
Optical and thermodynamic properties of Kerr-Bertotti-Robinson black holesWe investigate the thermodynamic and optical properties of Kerr--Bertotti--Robinson black holes, namely rotating black holes immersed in an external Bertotti--Robinson electromagnetic background. In…Hassan Hassanabadi, Michael R. R. Good, Soroush Zare et al.·Jul 13, 2026SaveLearn
Higher-derivative gravitational effective field theories are generically weakly hyperbolicWe analyse the initial-value problem of metric higher-derivative effective theories of gravity. We show that any such theory whose characteristic velocities are independent of derivatives of the…Farid Thaalba, Fernando Abalos, Miguel Bezares·Jul 13, 2026SaveLearn
Corrected thermodynamics and radiation predictions of modified black bounce compact objectsWe study the thermodynamic properties and radiation characteristics of a regular compact object obtained by applying the Simpson-Visser (SV) regularisation to the Schwarzschild modified gravity black…Shokhzod Jumaniyozov, Javlon Rayimbaev, Yassine Sekhmani et al.·Jul 13, 2026SaveLearn
Universal Bounds on Black Hole Observables Imposed by Energy ConditionsWe establish a universal connection between the classical energy conditions and directly observable black hole properties. By imposing the energy conditions locally at the photon sphere, we derive…Rahul Kumar Walia, Boris Georgiev, Chi-kwan Chan·Jul 13, 2026SaveLearn
Is there ghost and tachyon free bounce in UV complete gravity theory?Analytic infinite derivative gravity theories provide a renormalizable and ghost-free description of gravity around covariantly constant backgrounds. These theories can have non-singular bouncing…Hao Hu, Alexey S. Koshelev, Abhishek Naskar·Jul 13, 2026SaveLearn
A way to constrain a graviton mass from astronomical observationsAlong with a whole range of alternative theories of gravity, variants of the massive theory of gravity, i.e. the theory of gravity, in which the graviton has mass, have been actively discussed in…Alexander F. Zakharov, Predrag Jovanovic, Dusko Borka et al.·Jul 13, 2026SaveLearn
Black-hole evaporation from the semiclassical Einstein equations in 3+1 dimensionsWe solve the semiclassical Einstein equations for an evaporating Schwarzschild black hole in closed form, obtaining its backreacted geometry in 3+1 dimensions. This is achieved by a reformulation of…Adrián del Río, F. Javier Marañón-González·Jul 13, 2026SaveLearn
Dynamics and observational signatures of warm Dirac-Born-Infeld inflation with nonminimal derivative couplingThis paper investigates a warm Dirac-Born-Infeld (DBI) inflationary model with nonminimal derivative coupling (NMDC) to gravity, where the inflaton kinetic term interacts with the Einstein tensor,…Run-Qing Zhao, Xiao-Min Zhang, Peng-Cheng Chu et al.·Jul 13, 2026SaveLearn