Gravitational Waves from Primordial Black Holes formed by Null Energy Condition Violation during InflationA transient violation of the null energy condition (NEC) during inflation provides a novel mechanism for producing primordial black holes (PBHs) and stochastic gravitational wave (GW) backgrounds. In…Dong-Hui Yu, Jia-Zuo Zhang, Yong Cai·Jul 2, 2026SaveLearn
"Waveforms" at the HorizonWe study perturbations induced by a light particle scattering off a Schwarzschild black hole. Exploiting recent results for the wave propagation in this geometry, we derive the fields that this…Andrea Cipriani, Francesco Fucito, Carlo Heissenberg et al.·Jul 2, 2026SaveLearn
Lorentz-violating modifications to particle dynamics, thermodynamics and vacuum energy in bumblebee gravityWe investigate how spontaneous Lorentz symmetry breaking in bumblebee gravity modifies particle dynamics, thermodynamics, and vacuum energy around a static black hole background. Starting from the…A. A. Araújo Filho, K. E. L. de Farias, E. Passos et al.·Jul 2, 2026SaveLearn
Dynamical axisymmetric compact objects in General RelativityThe search for exact solutions describing asymptotically FLRW compact objects in General Relativity remains a challenging problem. Progress has largely been limited to the spherically symmetric case,…Jibril Ben Achour, Adolfo Cisterna, Mokhtar Hassaine·Jul 2, 2026SaveLearn
Gravitational decoupling and regular hairy black holes: Geodesic stability, quasinormal modes, and thermodynamic propertiesThe stability of geodesic orbits around a regular hairy black hole, in the gravitational decoupling setup, is investigated by employing Lyapunov exponents, which quantify the divergence rate of…R. C. de Paiva, K. S. Alves, R. T. Cavalcanti et al.·Jul 2, 2026SaveLearn
Exact Regions of Superradiant Instability of Kerr-Newman Black Holes and Massive Scalar FieldsWe investigate the superradiant instability of Kerr-Newman black holes in the presence of a massive, charged scalar field using the Vieira-Bezerra-Kokkotas (VBK) method. We study the solutions of the…John Adrian B. Baybay, Kevin T. Grosvenor·Jul 2, 2026SaveLearn
Quasinormal spectra of higher dimensional regular black holes in theories with infinite curvature correctionsWe investigate the quasinormal modes of massless scalar and electromagnetic test fields propagating on several families of higher-dimensional regular black holes arising in gravitational theories…Juan Pablo Arbelaez·Jul 2, 2026SaveLearn
Cosmological Model in f(R, G) Gravity : Stability Analysis and Observational Constraints from DESI DR2In this article, we examine the dynamical system of the Decoupled Power-law f(R,G) gravity model. This f(R,G) model framework is composed of interactions between dark matter and scalar…Shivani Sharma, R. Chaubey·Jul 2, 2026SaveLearn
Particle creation, clock variables, and relabelling symmetry in pull-back variational fluidsParticle-number conservation is usually built into the pull-back variational formulation of relativistic fluids because the conservative Eulerian variation of the number current is compatible with…Hyeong-Chan Kim·Jul 2, 2026SaveLearn
Global Distinctions Between New Electrovacuum and Kundt ClassIt was observed [2606.30426] that our recently constructed electrovacuum [2606.23782], supported by electromagnetic fields, can be locally transformed to a special Petrov type D solution within the…Liang Ma, H. Lu·Jul 1, 2026SaveLearn
Vacuum Cherenkov radiation in supercritical magnetic fieldsIn the presence of very intense electromagnetic fields, the refractive index of vacuum is modified such that light velocity is less than c and ultrarelativistic charged particles can be faster than…Daniel Gálvez-García, Nora Bretón·Jul 1, 2026SaveLearn
Impact of Spacecraft Orbit Uncertainties and Velocity Mismodeling on the LISA Gravitational-Wave ResponseThe Laser Interferometer Space Antenna (LISA) is a space-based gravitational wave observatory that consists of three spacecraft in a near-equilateral triangular formation. The spacecraft orbits are…Lorenzo Speri, Olaf Hartwig, Waldemar Martens et al.·Jul 1, 2026SaveLearn
Hypersurface Anchored Variational Principle for General RelativityA hypersurface anchored variational extension of General Relativity is formulated in which the Einstein-Hilbert action is supplemented by a diffeomorphism invariant functional supported on an…Prasanta Sahoo·Jul 1, 2026SaveLearn
Preheating and oscillon formation in Einstein-scalar-Gauss-Bonnet gravityNon-perturbative processes in the early universe may create overdense structures in scalar fields like the inflaton, called oscillons. In this work, we explore whether the leading order higher…Areef Waeming, Josu C. Aurrekoetxea, Katy Clough et al.·Jul 1, 2026SaveLearn
Backreaction of stimulated Hawking radiation in an optical analogueHawking radiation - the emission of quantum particles at the event horizon of a black hole - connects gravity with quantum mechanics and thermodynamics; the Bekenstein-Hawking entropy has been the…Lorenzo M. Procopio, Raul Aguero-Santacruz, David Bermudez et al.·Jul 1, 2026SaveLearn
Horizon-scale intensity and polarization images of rotating Konoplya-Zhidenko black holes with thick accretion flowsWe investigate the shadow and polarization images of a Konoplya-Zhidenko rotating non-Kerr black hole surrounded by a geometrically thick and optically thin accretion flow. The accretion flow is…Bing-Bing Chen, Chen-Yu Yang, Guo-Ping Li et al.·Jul 1, 2026SaveLearn
Environmental effects vs. modified gravity in the LISA massive black hole binary populationGravitational-wave signals from massive black hole binaries observed by LISA can carry imprints of both the astrophysical environment of the source and possible deviations from general relativity. We…Lorenzo Copparoni, Enrico Barausse·Jul 1, 2026SaveLearn
Gravitational Wave Signatures of Schwarzschild Black Hole in a Generalized Dehnen-Type (1,4,γ) Dark Matter HaloIn this paper, we investigate timelike geodesic motion, periodic orbits, and the associated gravitational-wave signals around a Schwarzschild-like black hole (BH) embedded in a generalized…Bahromjon Shokirov, Arabboy Mirzakulov, Tursunali Xamidov et al.·Jul 1, 2026SaveLearn
Closed Timelike Curves from a Vacuum Traveling WaveWe construct an exact vacuum spacetime that develops closed timelike curves from regular, asymptotically flat initial data respecting the weak, dominant, and strong energy conditions. Einstein's…Semin Xavier·Jul 1, 2026SaveLearn
Thermodynamic-Geometric Phase Transition and Gravitational-Wave Quasinormal Modes of Schwarzschild Black Holes in f(Q) Gravity: An RVB-Residue ApproachWe construct a residue-based framework connecting the thermodynamic geometry of a Schwarzschild-type black hole in f(Q) gravity with its gravitational-wave quasinormal-mode spectrum. The analysis…Wen-Xiang Chen·Jul 1, 2026SaveLearn
Spin-torsion interaction and geodesic bendingThe intrinsic spin of fermions induces torsion in spacetime, leading to an effective four-fermion interaction. This affects the bending of null and timelike geodesics inside a star with a spherically…Sagar Kumar Maity, Amitabha Lahiri·Jul 1, 2026SaveLearn
Relaxation without ringdown for a compact object in modified gravityCompact objects with black-hole-like exteriors may hide new strong-field physics in their interiors, making their dynamical response a sensitive probe of gravity beyond General Relativity. We present…Gianmassimo Tasinato·Jul 1, 2026SaveLearn
Reference Frames and Gravitational-Wave Polarizations: Symmetry Classification and Preferred-Frame PhenomenologyGravitational wave (GW) polarizations are traditionally classified in a fixed frame (E(2) classification), which does not account for how polarization patterns change under Lorentz boosts. In this…Jie Zhu, Hao Li·Jul 1, 2026SaveLearn
Comments on the non-existence of unified hoop conjectureIn a recent article, Hod [1] has concluded the non-existence, heretofore unnoticed, of a unified Thorne's hoop conjecture that holds for the quasi-local mass, M(r≤ R+) for…A. Bhattacharya, R. N. Izmailov, R. Kh. Karimov·Jul 1, 2026SaveLearn
Bondi Accretion onto a Damour-Solodukhin WormholeThe Damour-Solodukhin wormhole (hereinafter DSWH) is known to mimic Schwarzschild black hole (hereinafter SBH) horizon in some properties. To act as a mimicker, the DSWH parameter λ by definition…R. M. Yusupova, R. Kh. Karimov, A. Bhattacharya·Jul 1, 2026SaveLearn