Curvature-induced phantom behavior and cosmological bounces without violating the Dominant Energy ConditionWe show that a spatially closed universe can exhibit effective phantom dynamics (q<-1) and reach a finite-time cosmological event without violating the Dominant Energy Condition (DEC). Whereas the…Miguel Cruz, Samuel Lepe·Aug 18, 2026SaveLearn
No parametrisation, No Problem: A Weakly Modelled Framework to Constrain the Luminosity Distance--Redshift Relation Using Gravitational Wave SirensCosmological tests of general relativity (GR) using gravitational waves (GWs) often rely on parametrised forms of the luminosity distance-redshift ( d L - z) relation, which is modified in…Elena Colangeli, Konstantin Leyde, Tessa Baker et al.·Aug 18, 2026SaveLearn
Causal structure and light-conical singularities in Lorentzian simplicial quantum gravityThe definition of a Lorentzian gravitational path integral requires specifying which causal struc- tures are admitted off shell. Of particular importance are light-conical singularities, codimension-…Bianca Dittrich, José Padua-Argüelles·Aug 18, 2026SaveLearn
A more general exact solution for the Schwarzschild black hole in a Bertotti-Robinson-Bonnor-Melvin universeWe begin by introducing a new parameterization for the Ovcharenko-Podolský family of exact solutions of the Einstein-Maxwell equations describing uncharged and non-accelerating static black holes…Andrea Di Pinto·Aug 18, 2026SaveLearn
Gravitational Waves from Green's Function Decomposition for a Kerr black hole: I. Equatorial ISCO PlungeWe present a decomposition of the Kerr Green's function in the time domain, motivated by the frequency-domain split previously studied in the Schwarzschild limit. We show that the identification…Junquan Su, Neev Khera, Abhishek Chowdhuri et al.·Aug 18, 2026SaveLearn
Thermomechanics of Horndeski Scalar Hair with Spacelike GradientsWe develop a thermomechanical framework for viable Horndeski scalar hair with spacelike scalar-field gradients. Adapting the (1+1+2) formalism to the scalar configuration, we apply the…Marcello Miranda, Marco Sebastianutti, Andrea Giusti·Aug 18, 2026SaveLearn
Vacuum Polarization in Quantum-Corrected and Effective Black Hole Geometries: a High Performance ApproachWe compute the renormalized scalar vacuum polarization ϕ2 of a massive, non-minimally coupled quantum field in the Hartle--Hawking state exterior to a family of static, spherically…Antonino Flachi·Aug 18, 2026SaveLearn
Ostrogradsky's Theorem is Incompatible with Background Independence in Quantum GravityOstrogradsky's theorem shows that higher-derivative dynamical systems inevitably yields a Hamiltonian featuring a ghost mode that is unbounded from below. However, we argue that this theorem is…Ken-ji Hamada·Aug 18, 2026SaveLearn
Testing f(R) gravity using gravitational-wave signals from binary mergersRecently, several studies have investigated the validity of General Relativity predictions. Gravitational waves provide an ideal probe for testing the theory in the strong-field regime. In this work,…M. D. C. Torri·Aug 17, 2026SaveLearn
Bayesian constraints on quadratic f(Q) gravity from the ADM mass of white dwarfsWe calculate static equilibrium sequences for white dwarfs (WDs) in quadratic symmetric teleparallel gravity, f(Q)=Q+alpha Q2, and perform a Bayesian comparison between the negative-coupling sector,…Edson Otoniel, Lucas A. Souza, Jonathan A. Rebouças et al.·Aug 17, 2026SaveLearn
Removability criterion for radiative corrections to the Starobinsky attractor in weakly nonlocal gravityRadiative corrections at the percent level can shift the predictions of α-attractor and Starobinsky-like models into the region of the (ns,r) plane preferred by ACT DR6. We show that the…Ekapob Kulchoakrungsun, Phongpichit Channuie, Daris Samart·Aug 17, 2026SaveLearn
Rational regular black holes in non-polynomial gravityWe consider the d≥ 4 non-polynomial pure gravity theories defined so that their 2D reduction to spherical symmetry minimally modifies that of General Relativity at small distances. They satisfy…Aimeric Colléaux·Aug 17, 2026SaveLearn
Exact black hole solutions with semi-symmetric vectorial torsionSemi-Symmetric metric gravity extends general relativity by introducing a semi-symmetric connection with vectorial torsion. The modified field equations contain extra contributions from the torsion…Lehel Csillag, Tiberiu Harko·Aug 17, 2026SaveLearn
Wormhole Reconstruction in Non-Conservative Unimodular Gravity: Ricci Scalar as an Independently Prescribed Curvature ProfileThe absence of an algebraic relation between the Ricci scalar and the trace of the energy-momentum tensor in Non-Conservative Unimodular Gravity (NUG) opens new possibilities for…Marcelo H. Alvarenga, Rodrigo Santos Bufalo, Júlio C. Fabris·Aug 17, 2026SaveLearn
Astrophysical Graviton Squeezing Can Be Hidden in the Far-FieldWhile localized astrophysical sources can generate macroscopic graviton squeezing, their observable quantum signatures at far-field detectors remain unresolved. In this work, we investigate the…Cheng-Jun Fang, Zong-Kuan Guo, Zhen-Hong Lyu et al.·Aug 17, 2026SaveLearn
Polytropic wormholesTraversable wormholes in general relativity require non-standard matter sources, making the identification of physically motivated equations of state particularly important. We investigate wormholes…Remo Garattini, Emmanuel N. Saridakis, Athanasios G. Tzikas·Aug 17, 2026SaveLearn
On the (Non)Unitarity with respect to the Clock of a Dynamical Local Observer and the Einstein Equivalence PrincipleWe investigate the unitarity of quantum evolution relative to an internal time defined by a local observer's clock. The observer is modeled as a relativistic particle carrying both a clock and a…Kengo Shimada·Aug 17, 2026SaveLearn
Non-exotic traversable wormholes in Einstein-Chern-Simons gravityWe investigate traversable wormhole solutions in five-dimensional Einstein-Chern-Simons (EChS) gravity, a gauge-theoretic extension of General Relativity that introduces a higher-curvature correction…Mauricio Cataldo, Fernando Goméz, Paola Meza et al.·Aug 17, 2026SaveLearn
Quasi-local Hamiltonian for generalized Kerr-Schild black holes in the Iyer-Wald formalismGrounded in the covariant phase space approach of the Iyer-Wald formalism, we propose a quasi-local Hamiltonian for generalized Kerr-Schild (GKS) black holes. Evaluated for spherically symmetric…M. A. Jaraba, T. L. Campos, M. C. Baldiotti·Aug 17, 2026SaveLearn
Quasinormal Modes of Black Holes Embedded in Dark-Matter Halos: Analysis of Dehnen(1, 4, 5/2) and DC14 Density ProfilesWe investigate how a surrounding dark-matter halo imprints itself on the QNM spectrum of a static, spherically symmetric black hole, considering two physically distinct density profiles: the Dehnen…Gaurav Rachh·Aug 17, 2026SaveLearn
Exceptional lines of Reissner-Nordström-de Sitter black hole surrounded by a thin shell of matterWe study the exceptional line (EL) in the quasinormal modes (QNMs) of Reissner-Nordström-de Sitter black hole surrounded by a static thin shell of matter. For a conformally scalar perturbation, we…Liang-Bi Wu, Yu-Sen Zhou, Ming-Fei Ji et al.·Aug 17, 2026SaveLearn
Limiting cases of second-order moments of relativistic stars and their universalityExtending the work presented in a workshop ``From Quarks to Neutron Stars: Insights from kHz gravitational waves'', we discuss some limiting cases of the moment of inertia, tidal…Koutarou Kyutoku·Aug 17, 2026SaveLearn
Charge-Induced Pole Cancellation and Horizon Transitions in Scale-Dependent Gravitational CollapseWe construct a charged Oppenheimer-Snyder-like collapse model in scale-dependent gravity by matching a spatially flat FLRW interior to a charged scale-dependent exterior across a timelike thin shell.…Ghulam Muhammad, Syed Zaheer Abbas, Muhammad Sajjad·Aug 17, 2026SaveLearn
Exceptional points of the Schwarzschild spectrum under local potential perturbation: The Princess and the PeaBlack-hole quasinormal modes (QNMs) may coalesce at exceptional points (EPs) in the frequency spectrum. We study EPs and their phenomenology for gravitational perturbations of a Schwarzschild black…Mohamed Ould El Hadj, Sam R. Dolan·Aug 17, 2026SaveLearn
Dark Matter Admixed Quark Stars: A Relativistic Two-Fluid ApproachIn this paper, we examine the stellar properties of quark stars containing dark matter, focusing on both non-rotating and slowly rotating configurations. By employing a two-fluid framework, we…N. Priyobarta, S. K. Maurya, Ksh Newton Singh et al.·Aug 17, 2026SaveLearn