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General Relativity and Quantum Cosmology papers

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Spin-network states for the Bianchi I and IX cosmological models from quantum constrained symmetries
In this work, we implement at the quantum level the gauge-fixing conditions that relate the homogeneous SU(2) gauge theory of Ashtekar variables, describing the classical cosmological sector, to the…
Matteo Bruno, Giovanni Montani, Edoardo Maria PannoSep 17, 2026
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Entropy, area, and the choice of regulator during gravitational collapse
We present a real time formalism to numerically describe the gravitational collapse of a scalar quantum field in the spherically symmetric case. We employ a Pauli-Villars regulator that is…
Jana N. Guenther, Christian Hoelbling, Sophie Mutzel et al.Sep 17, 2026
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On the Extended Kerr-Newman-Bertotti-Robinson Spacetime: Two Black Holes and a Naked Singularity in Bertotti-Robinson Universe
We introduce new coordinates that extend the Kerr--Newman--Bertotti--Robinson spacetime consistently with the previous reciprocal continuation. In these coordinates, the two points at Ω=0 are…
Yu-Sen Zhou, Wen-Tao Fu, Li-Ming Cao et al.Sep 17, 2026
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The return of Palatini inflationary attractors: Universal mapping of observables
We study single-field slow-roll inflation in the context of Palatini gravity for the class of non-minimally coupled ξ-attractors, i.e.,\ models where the same function f(ϕ) fixes both the…
Christian Dioguardi, Francesco Gianesello, Antonio RacioppiSep 17, 2026
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Gravity from Invariant Weyl-Integrable space-time (IWIST)
In this paper we propose a geometrically motivated formulation of gravity in an invariant Weyl--Integrable space-time (IWIST), in which the background geometry is not imposed a priori but is…
José Edgar Madriz Aguilar, A. Bernal, M. Montes et al.Sep 17, 2026
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Quasinormal modes of Schwarzschild--AdS black holes with a near-horizon reflective surface
We investigate the scalar quasinormal mode (QNM) spectrum of Schwarzschild-AdS black holes with a partially reflective surface placed near the event horizon. The corresponding QNM problem is solved…
Libo Xie, Liang-Bi Wu, Yu-Sen Zhou et al.Sep 17, 2026
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Extremal Scalarization of Charged Black Holes: Miransky Scaling across Reissner-Nordström Extremality
We study spontaneous scalarization near and at extremality in Einstein-Maxwell-scalar theory. As Reissner-Nordström (RN) extremality is approached from below, the nonextremal scalarization existence…
Hong Guo, Yun Soo Myung, Lijing ShaoSep 17, 2026
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Extending the Love-Q Relation to Rapidly Rotating Neutron Stars for Gravitational-Waveform Modelling
Gravitational-wave observations of binary neutron star mergers probe the neutron star equation of state through finite-size effects on the waveform. These include the tidal deformation of the stars…
Natalie Williams, Tim DietrichSep 17, 2026
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Relativistic Stellar Oscillations from Ultralight Dark Matter
Ultra-light dark matter, composed of bosons behaving as classical waves, can resonantly excite stellar oscillations. In this work, we investigate this phenomenon in relativistic stars, showing that…
Shanae Oishi, Christopher Reyes, Jeremy SaksteinSep 16, 2026
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Classical Noise in Transient USR Inflation
In single-field inflation, linear perturbations originate as quantum fluctuations and undergo a quantum-to-classical transition on super-horizon scales as the decaying mode of the comoving curvature…
Harish D. N., Chen-Pin Yeh, Da-Shin LeeSep 16, 2026
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On Stochastic Memory Backgrounds In LISA
Gravitational-wave (GW) memory is a permanent change in spacetime geometry induced by a burst of gravitational waves. It is theoretically interesting for its connection to asymptotic symmetries, but…
James Buda, Andrew Laeuger, Yanbei ChenSep 16, 2026
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Deep Learning Detection of Beyond-General-Relativity Deviations in Gravitational-Wave Signals: A Detection-Threshold Study with Real LIGO Noise
We study machine-learning detection of controlled beyond-General-Relativity (beyond-GR) deviations in gravitational-wave signals, using both synthetic aLIGO-PSD noise and real LIGO H1 detector…
Muhammad Adnan ShahzadSep 16, 2026
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Bosonic stars with dark electroweak fields
We construct bosonic stars in the Einstein-Weinberg-Salam theory, namely the bosonic sector of the electroweak Standard Model minimally coupled to Einstein's theory of gravity. These…
Etevaldo dos Santos Costa Filho, Romain GervalleSep 16, 2026
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Symmetry-Driven k-Essence Cosmological Dynamics
We investigate a family of k-essence cosmological models selected by the requirement that the field equations admit a nontrivial variational symmetry. For the k-essence theory with Lagrangian…
Andrés Lueiza-Colipí, Nikolaos Dimakis, Genly Leon et al.Sep 16, 2026
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Black Hole Shadow and Light Deflection in Generalized Heisenberg-Euler Nonlinear Electrodynamics
We study the optical properties of electrically charged black holes sourced by generalized Heisenberg-Euler nonlinear electrodynamics (NLED) in the second-order formalism. Using the exact parametric…
Beyhan Puliçe, Ali Övgün, Yosef VerbinSep 16, 2026
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Shadow and Polarized Images of Schwarzschild-MOG Black Hole Illuminated by Thick Accretion Disk
Recent EHT polarimetric observations provide a powerful probe of near-horizon physics and modified gravity. We investigate the shadow and polarization images of a static Schwarzschild-MOG black hole…
Cheng Hu, Huan Ye, Hong Lei et al.Sep 16, 2026
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Second-order slow rotation of wormholes in Einstein-scalar-Gauss-Bonnet gravity
We investigate slowly rotating traversable wormholes in Einstein--scalar--Gauss--Bonnet gravity beyond the linear rotation regime. The static backgrounds are obtained without expanding in the…
Sardor Murodov, Bekzod Rahmatov, Javlon Rayimbaev et al.Sep 16, 2026
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Causal structure and optical signatures of rotating power law Kalb-Ramond geometry
We investigate a stationary and axisymmetric power law Kalb-Ramond geometry, obtained as a rotating extension of the asymptotically flat static solution. We reconstruct the exact inverse Einstein…
Hassan Hassanabadi, Orlando LuongoSep 16, 2026
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Searching for gravitational wave echo with group equivariant neural posterior estimation
Current methods for the gravitational-wave (GW) echo searches generally require substantial computational time and resources. Recent advances in group equivariant neural posterior estimation (GNPE)…
Jian-Wei Luo, Yun-Song PiaoSep 16, 2026
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Horizon--orbit scale competition underlying chaos bound violation for spinning particles
In this paper, we investigate the chaos bound through the local radial instability of charged spinning test particles on unstable circular orbits in the black-bounce--Kerr--Newman spacetime. Our…
Deyou Chen, Chuang Yang, Kangqiao LiuSep 16, 2026
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Symmetry preservation in black hole quasinormal mode spectra
We establish a general relation between symmetries of gravitational theories and black hole (BH) quasinormal mode (QNM) spectra. We show that a symmetry implies isospectrality when it induces a…
Han-Wen Hu, Chen Lan, Zong-Kuan Guo et al.Sep 16, 2026
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Correlated Galactic Confusion Foreground for the LISA-Taiji-TianQin Network and Its Impacts on Resolvable-Source Analysis
The millihertz gravitational-wave sky is expected to be observed by a network of space-based detectors (LISA, Taiji, and TianQin) in the 2030s. A dominant noise in this band is the confusion…
Minghui Du, Peng Xu, Ziren LuoSep 16, 2026
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An Operative Viability Boundary for Relaxed Single-Particle Penrose Extraction in Kerr-Vaidya Spacetimes
We present a corrected numerical investigation of the Penrose process in the Kerr-Vaidya metric for a rotating black hole losing mass at constant rate. We fix two errors from an earlier version: an…
Fabio BuffoliSep 15, 2026
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Stochastic Thermodynamics of Dynamical Thin-Shell Wormholes: Effective Temperatures, Fluctuations and Conditional Quasi-Horizon Unification
We develop an effective stochastic and semiclassical framework for dynamical thin-shell wormholes connecting two asymptotic spacetime regions. The Israel junction geometry is separated from the…
Francisco S. N. Lobo, Manuel E. RodriguesSep 15, 2026
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Extremal curves of Perlick's proper time in Weyl geometry
We investigate the extremization of Perlick's proper time in non-integrable Weyl geometry. We derive the corresponding generalized Euler--Lagrange equations and show that the resulting extremals…
E. Rodrigues, F. Dahia, I. P. Lobo et al.Sep 15, 2026
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