Underlying mechanisms of phase transitions in scalar-tensor theoriesSpontaneous scalarization phenomenon in scalar-tensor gravity is known to be a form of phase transition, and it was recently shown that the order of this transition changes depending on the…Murat Özinan, Kıvanç İ. Ünlütürk, Fethi M. Ramazanoğlu·Jul 21, 2026SaveLearn
Homothetic Killing horizons in generic Vaidya spacetimesWe study the conformal Killing equation for generic Vaidya-like spacetimes, including those with rotation. We show that these spacetimes admit a unique class of conformal Killing vectors that are…Ritwika Ghoshal, Nilay Kundu, Srijit Bhattacharjee·Jul 21, 2026SaveLearn
Chase Orbits, not Time: A Scalable Paradigm for Long-Duration Eccentric Gravitational-Wave SurrogatesOrbital eccentricity is a key tracer of the astrophysical origins of compact binaries. Yet it remains absent from routine LIGO-Virgo-KAGRA analyses, in part because of the prohibitive computational…Akash Maurya, Prayush Kumar, Scott E. Field et al.·Jul 21, 2026SaveLearn
Reassessing the foundations of Metric-Affine GravityWe reassess foundational aspects of Metric-Affine Gravity (MAG) in light of the Dressing Field Method, a tool allowing to systematically build gauge-invariant field variables. To get MAG started, one…J. François, L. Ravera·Jul 21, 2026SaveLearn
Static horizons in cosmologyAlthough previous results have ruled out the possibility of a static event horizon in cosmology, we present black hole and white hole metrics that retain static event horizons while reproducing…Ida M. Rasulian, Amjad Ashoorioon·Jul 21, 2026SaveLearn
Quasinormal modes of Kerr-like black bounce spacetimeWe investigate the quasinormal mode (QNM) spectrum of a Kerr-like black-bounce spacetime under massive scalar-field perturbations. Starting from the Kerr-like deformation of the Simpson--Visser…Yi Yang, Dong Liu, Ali Övgün et al.·Jul 21, 2026SaveLearn
Modified Cosmology from Mass-to-Horizon Relation: Observational BoundsWe constrain the class of modified cosmologies derived in Paper I [1] from a generalized mass-to-horizon relation (MHR) that enforces thermodynamic consistency between the Cai-Kim horizon temperature…Pranav Prasanthan, Hussain Gohar, Vincenzo Salzano·Jul 20, 2026SaveLearn
Vacuum Gravity from Entropy: Stability, Spectra, and Exact WavesWe analyze the vacuum dynamics of Gravity from Entropy, including its algebraically constrained G-field formulation. Evaluating the curvature traces over zero-, one-, and two-form sectors, we show…David S. Pereira·Jul 20, 2026SaveLearn
Nonradial perturbations of static charged wormholesWe investigate the nonradial quasinormal-mode spectrum of static charged Ellis--Bronnikov wormholes in Einstein--Maxwell theory minimally coupled to a phantom scalar field. The background solutions…Jose Luis Blázquez-Salcedo, Luis Manuel González-Romero, Fech Scen Khoo et al.·Jul 20, 2026SaveLearn
Hawking emission of massive vector fields by Kerr black holesWe compute, for the first time, the Hawking emission spectrum of massive vector (Proca) fields by spinning Kerr black holes, determining the associated greybody factors and the resulting mass and…Marco Calzà, Miguel Faria, Yuber F. Perez-Gonzalez et al.·Jul 20, 2026SaveLearn
Post-Newtonian Global Conservation Laws in the Presence of Sensitive BodiesThe parameterized post-Newtonian (PPN) approach is the state of the art formalism for performing theory independent tests of weak-field gravity, and for constraining possible deviations from…Timothy Clifton, Asta Heinesen, Oliver Pitt·Jul 20, 2026SaveLearn
Defocusing dark energy: Raychaudhuri diagnostics beyond w<-1/3 and the phantom divideIn general relativity, cosmic acceleration is timelike defocusing of the comoving congruence and requires a negative total active gravitational mass density, $M tot=ρ…Özgür Akarsu, Antonio De Felice, N. Merve Uzun·Jul 20, 2026SaveLearn
Harmonic oscillation and orbital morphology for spinning charged quantum corrected black holeThis study investigates the dynamical behavior of particle's test around a spinning charged Einstein-Maxwell-dilaton (EMd) quantum corrected black hole (QCBH) by examining the effects of spinning…Rameez Khalid, Muhammad Yasir, Shahid Qaisar et al.·Jul 20, 2026SaveLearn
Massive Compact Stars Beyond the General Relativity Limit in Finslerian Gravity: A Possible Explanation for the GW190814 SecondaryThe existence of an upper mass limit for compact stars is one of the fundamental predictions of general relativity (GR), with important implications for the outcome of compact binary mergers and the…Praveen J, Rajesh Kumar, Sadaf Fatima et al.·Jul 20, 2026SaveLearn
Evaporation and fate of covariant quantum black holesA growing number of phenomena and theoretical problems indicate that quantum gravity theory is necessary. In this paper, we investigate the evaporation of covariant quantum BHs for particles with…Li-Shuai Wang, Xiangdong Zhang·Jul 20, 2026SaveLearn
Shadow of the generalized Vaidya black holeIn this paper, we investigate the shadow of the generalized Vaidya black hole described by the Husain solution. Assuming a barotropic equation of state for the additional matter sector, we first…Vitalii Vertogradov, Ali Övgün·Jul 20, 2026SaveLearn
Acoustic Firewalls: Analogue Gravity Perspective on the AMPS ParadoxThe monogamy of quantum entanglement, applied by Almheiri-Marolf-Polchinski-Sully (AMPS) to black holes, obstructs a smooth horizon vacuum after the Page time. We transcribe this argument to…Nikolay S. Akintsov, Artyom P. Nevecheria, Stepan N. Andreev et al.·Jul 20, 2026SaveLearn
Regular black holes with Minkowskian cores: causal structure and observational degeneracyWe construct a new family of asymptotically flat static and rotating regular black holes characterized by a Minkowskian core and a finite two-horizon structure. The solutions are obtained within the…Francisco Tello-Ortiz, Y. Gómez-Leyton, Alejandro Rueda et al.·Jul 20, 2026SaveLearn
Establishing Compactness as a Population Observable in Gravitational-Wave AstronomyClassically, black holes (BHs) are the most compact objects predicted in nature with C=0.5 in the Schwarzschild limit; C is defined as the mass-to-radius ratio in geometric units. In this work we…Shrobana Ghosh, Charlie Hoy, Mark Hannam et al.·Jul 20, 2026SaveLearn
Compactness Inference in Gravitational-Wave Mergers with PhenomDECO: Catalog Benchmarks and Robustness DiagnosticsSeveral gravitational wave (GW) observations have been identified as binary black hole (BBH) mergers, including systems with component masses that challenge typical formation scenarios. These…Shrobana Ghosh, Charlie Hoy, Mark Hannam et al.·Jul 20, 2026SaveLearn
A Shortest-Path Anisotropy Diagnostic for Black-Hole Graph GeometriesShortest paths in a geometric graph carry information not only about connectivity, but also about how the underlying sampled geometry is encoded by the graph. Here we study this idea for embedded…Ariadna Uxue Palomino Ylla·Jul 20, 2026SaveLearn
Rational Orbits and Gravitational Waves in Static Spherical Spacetimes: An Open-Source Numerical FrameworkTimelike orbits constitute a crucial probe for exploring the intrinsic properties of curved spacetimes, and the carried gravitational radiation signals provide a direct window into strong field…Dan Li, Shiyang Hu, Chen Deng et al.·Jul 20, 2026SaveLearn
Rapidly Rotating Neutron Star Collapse in Massive Scalar-Tensor TheoriesWe present a full 3D numerical evolution code to study neutron stars in massive-scalar-tensor theories. The code is embedded in the Einstein Toolkit framework and its implementation constitutes a…José Carlos Olvera M., Daniela D. Doneva, Pablo Cerdá-Durán et al.·Jul 20, 2026SaveLearn
Can wormholes have vanishing Love numbers?Wormholes are fascinating alternatives to black hole geometries. In this paper, we have studied a special case of wormhole solution in the context of R=0 spacetime. Our approximate analytical…Shauvik Biswas·Jul 20, 2026SaveLearn
Persistence and Transition Varieties in Scalar Field CosmologyWe develop a unified bifurcation-theoretic description of Friedmann--Robertson--Walker cosmologies with a scalar field, a barotropic fluid of index γ, and spatial curvature. For the exponential…Spiros Cotsakis·Jul 20, 2026SaveLearn