Nonradial oscillations of realistic anisotropic neutron stars: Polar modesIn this work, we study the polar perturbations of static, spherically symmetric neutron stars with anisotropic pressure in full general relativity, including linear-order perturbations of both the…L. M. Becerra, José F. Rodríguez-Ruiz, E. A. Becerra-Vergara et al.·Sep 7, 2026SaveLearn
NRSur7dq4v2: A multi-domain precessing surrogate model with improved accuracyNumerical relativity simulations provide the most accurate waveforms for binary black hole coalescences, but are prohibitively expensive for direct use in gravitational-wave data analysis. Surrogate…Abhishek Ravishankar, Vijay Varma, Scott E. Field et al.·Sep 7, 2026SaveLearn
Scalar field with nonminimal couplings to metric-affine geometryWe study a scalar field nonminimally coupled to metric-affine gravity within actions linear in the affine curvature and containing all independent parity-even and parity-odd terms quadratic in…Ilaria Andrei, Damianos Iosifidis, Laur Järv et al.·Sep 7, 2026SaveLearn
Coherent Selection of Critical Kasner ResponseA coherent wave component with extremely small initial self-energy can substantially change the first response of a contracting spacetime. We demonstrate this effect in Einstein--Maxwell--scalar…Yi-kun Li·Sep 7, 2026SaveLearn
The generalized second law for Kerr-Taub-NUT black holes perturbed by test fieldWe evaluate the variations in the area and the entropy of Kerr-Taub-NUT black holes perturbed by bosonic and fermionic test fields. We demonstrate that the critical frequency for a test field at…Koray Düztaş, Ahmet Cem Erdoğan·Sep 7, 2026SaveLearn
Global structure and stability of Kerr-Bertotti-Robinson spacetimeThe surface r=∞ of the Kerr-Bertotti-Robinson spacetime is not a genuine boundary. We construct its natural analytic extension and show that r=+∞ of one KBR region is smoothly connected…Yu-Sen Zhou, Liang-Bi Wu, Ming-Fei Ji et al.·Sep 7, 2026SaveLearn
Globally regular charged black holes in non-polynomial quasi-topological gravity with Born-Infeld electrodynamicsWe construct exact static, spherically symmetric charged solutions in four-dimensional non-polynomial quasi-topological gravity coupled to Born-Infeld electrodynamics. We focus on the model…Hong-Lin Liu, Zhong-Wen Feng, Qing-Quan Jiang et al.·Sep 7, 2026SaveLearn
Thermodynamics and phase transitions of spherically symmetric AdS regular black holesWe obtain the singular ''mother'' black hole solution by solving the coupling between Einstein gravity with a cosmological constant and a nonlinear electromagnetic field. The…Qi-Quan Li, Yu Zhang, Hoernisa Iminniyaz·Sep 7, 2026SaveLearn
Binary Black Holes in Einstein-Maxwell-Dilaton Theory: Second Post-Newtonian Dynamics from Effective Field TheoryThe detection of gravitational waves from compact binary coalescences provides a powerful opportunity to test general relativity in the strong-field regime and to search for signatures of alternative…Pawan Kumar Gupta·Sep 7, 2026SaveLearn
Black Holes Thermodynamic Topology in Sharma-Mittal StatisticsIn this study, we explore the thermodynamic topology of black holes within the Sharma-Mittal entropy framework. Our study covers several black hole solutions, including charged and uncharged black…Issam Najma, Yahya Ladghami, Amine Bouali et al.·Sep 7, 2026SaveLearn
Exact Cancellation of Horizon Modes in Kerr RingdownRingdown gravitational waves probe black hole spacetimes via quasinormal modes (QNMs). Recent studies have reported oscillatory features in QNM-filtered waveforms, and have led to conflicting…Kei-ichiro Kubota, Yusuke Manita, Hayato Motohashi et al.·Sep 7, 2026SaveLearn
Darboux Isospectrality Constraints on Quasinormal Modes Deformed by BumpsA localized Gaussian or Pöschl-Teller bump is widely used to probe the sensitivity of Schwarzschild quasinormal modes, where it is typically added to both the Regge-Wheeler and Zerilli potentials. We…Zhen-Xiao Zhang, Chen Lan, Yan-Gang Miao·Sep 7, 2026SaveLearn
Thin accretion-disc transfer functions in the q-metric spacetime: quadrupolar lensing signaturesWe study geometrically thin equatorial disc images in the static, axisymmetric q-metric spacetime using backward ray tracing. The Schwarzschild solution is recovered at q=0; for the nonzero…Saken Toktarbay, Manas Khassanov, Aray Muratkhan et al.·Sep 7, 2026SaveLearn
The (in)stability on total transmission modes with small bumpsTotal transmission modes (TTMs) are a class of reflectionless solutions to black hole perturbation equations, closely related to quasinormal modes (QNMs), and can exhibit significant sensitivity to…Xi-Ning Dong, Liang-Bi Wu, Yu-Sen Zhou et al.·Sep 7, 2026SaveLearn
A New Window for Testing the PPN in the Strong-Field Regime: Stellar Rotation of S301The recently discovered S301 star, with an orbital period of 8.7 years and eccentricity e = 0.982, reaches a pericenter of just 140\,Rs --- approximately nine times closer than…Mohsen Khodadi, Salvatore Capozziello·Sep 7, 2026SaveLearn
The Dynamical Instability of Rotating Boson StarsWe investigate the dynamical instability of rotating boson stars described by the Gross--Pitaevskii--Poisson equations with contact self-interactions. Through three-dimensional simulations, we…Kai-Dong Zhou, Shou-Shan Bao, Jian Deng et al.·Sep 7, 2026SaveLearn
Dissection of a merger-ringdown waveform in the small-mass-ratio limitWork over the past two decades has unveiled the rich phenomenology of black hole binary mergers and subsequent ringdowns, involving a tapestry of quasinormal modes (QNMs), nonlinearities, tails,…Patrick Bourg, Lorenzo Küchler, Benjamin Leather et al.·Sep 6, 2026SaveLearn
Physics-based phenomenological modeling of binary black hole hierarchical formation 2: Autodifferentiable functional inference of hierarchical compact-binary populationsThe gravitational-wave (GW) census contains mass and spin structure consistent with contributions from black holes assembled through repeated mergers in dense environments. Connecting that structure…R. O'Shaughnessy, M. Zeeshan, M. Qazalbash·Sep 6, 2026SaveLearn
Shadows and Thin-Disk Images of Kerr-Newman Black Holes in a Bertotti-Robinson Magnetic FieldIn this paper, we investigate the optical properties of Kerr-Newman-Bertotti-Robinson (KN-BR) black holes. We use the separability of null geodesics to analyze unstable spherical photon orbits and…Xi Wan, Haiyu Wang, Zhenyu Zhang et al.·Sep 6, 2026SaveLearn
Semilinear wave equations on the Witten bubble spacetimeWe initiate the study of nonlinear wave equations on the Witten bubble spacetime (also known as the "bubble of nothing"), which is an SO(3,1)× U(1)-symmetric solution…Onyx Gautam·Sep 6, 2026SaveLearn
Cycles Without End: An Ekpyrotic Braneworld Bounce with a Kinetically Coupled Entropic MechanismCyclic cosmologies replace inflation's single creation event with an eternal sequence of smooth turnarounds, but three problems have historically stood in their way: singular bounces, the blue…Rikpratik Sengupta·Sep 6, 2026SaveLearn
Distinguishing lensing and precessional modulation in binary black-hole inspiral waveformsBinary black holes (BBHs) emit gravitational waves (GWs) as they inspiral towards merger. These GWs can be gravitationally lensed by large-scale structure along the line of sight, potentially…Tien N. Nguyen-Vo, Tamanjyot Singh, Benjamin McKallip et al.·Sep 6, 2026SaveLearn
Joint Constraints on Quantum Oppenheimer--Snyder Black Holes from High-Frequency Quasi-Periodic Oscillations in X-ray Binary Systems and the S2 Star OrbitWe study a quantum-corrected version of the Oppenheimer--Snyder (OS) spacetime in which classical collapse is modified by a single effective-parameter \(α\), representing small-quantum-gravitational…A. Errehymy, Y. Khedif, M. Daoud et al.·Sep 5, 2026SaveLearn
Alternative neural-network follow-up for all-sky FrequencyHough in continuous gravitational-wave searchesContinuous gravitational waves are long-lived signals emitted by spinning neutron stars (NSs) or boson clouds around black holes. While the Milky Way is expected to host O(108-109)…Martina Di Cesare, Pia Astone, Rosario De Rosa et al.·Sep 5, 2026SaveLearn
Heat distribution of quantum fields interacting with Unruh-DeWitt detectorsWe introduce an operational framework for heat-exchange statistics between a quantum field and an Unruh-DeWitt detector in Minkowski spacetime. Using an interferometric protocol, we define the…Marcos L. W. Basso, Alberto Saa·Sep 5, 2026SaveLearn