gr-qc papers | Gist.Science

Quantum gravity represents the frontier where the very large meets the very small, attempting to unify Einstein's theory of gravity with the strange rules of quantum mechanics. This field explores the fundamental fabric of spacetime, seeking to understand how the universe behaves at its most extreme scales, from the heart of black holes to the moment of the Big Bang. Because these concepts often involve complex mathematics, they can feel distant to non-specialists, yet they hold the key to a complete picture of physical reality.

At Gist.Science, we bridge this gap by processing every new preprint in this category directly from arXiv. Our team provides both plain-language explanations and detailed technical summaries for each paper, ensuring that groundbreaking research is accessible to everyone, from curious students to seasoned researchers. Below are the latest papers in quantum gravity, offering fresh insights into the nature of our cosmos.

Probing the sensitivity of dark energy dynamics to equation of state parametrization flexibility

This paper investigates whether apparent deviations from the $\Lambda$ CDM model in dark energy dynamics reflect genuine phantom-like evolution or parametrization artifacts, finding that while flexible models like power-law forms mildly improve fits and consistently suggest phantom behavior at intermediate redshifts ( $1 \leq z \leq 2$ ), the statistical significance remains modest and the specific evolutionary details are not robustly constrained.

Md. Wali Hossain2026-04-21⚛️ gr-qc

Creation of spin-3/2 dark matter via cosmological gravitational particle production

This paper investigates the cosmological gravitational production of stable spin-3/2 particles, termed "raritrons," demonstrating that their ability to constitute dark matter depends critically on the mass hierarchy relative to the inflationary Hubble scale, which governs the sound speed of the longitudinal mode and can lead to significant enhancements in particle production, particularly for lighter masses or time-dependent mass scenarios.

Edward W. Kolb, Andrew J. Long, Evan McDonough, Jingyuan Wang2026-04-21⚛️ hep-ph

Measuring Eccentricity and Addressing Waveform Systematics in GW231123

This paper reanalyzes the heavy binary black hole event GW231123 using a complete physical model to demonstrate that the event exhibits no significant eccentricity and that previous discrepancies in parameter estimates stem from waveform model disagreements regarding strong spin precession rather than orbital eccentricity.

Aasim Jan, Sophia Nicolella, Deirdre Shoemaker, Richard O'Shaughnessy2026-04-21⚛️ gr-qc

Isotropic stochastic gravitational wave background reconstruction for Taiji constellation

This paper presents a preliminary data analysis pipeline for the Taiji space mission that successfully reconstructs the isotropic stochastic gravitational wave background, demonstrating its ability to recover both known and unknown spectral morphologies from simulated datasets while addressing the unique challenges of space-based noise separation.

Yang Jiang, Qing-Guo Huang2026-04-21⚛️ gr-qc

Resumming Scattering Amplitudes for Waveforms

This paper introduces a non-perturbative formalism inspired by Feshbach's projector method to compute 5-point scattering amplitudes and derive gravitational waveforms for arbitrary two-body trajectories by relating effective emission potentials to perturbative amplitudes and applying the KMOC framework.

Katsuki Aoki, Andrea Cristofoli2026-04-21⚛️ hep-th

Numerical investigation of the generalized Jang equation coupled to conformal flow of metrics

This paper presents a numerical investigation demonstrating that, unlike the Jang/zero divergence system which exhibits a finite-radius breakdown, coupling the generalized Jang equation to the conformal flow of metrics in spherically symmetric, time-symmetric settings preserves solution regularity, suggesting this modified system remains a viable approach for proving the Penrose conjecture.

Hollis Williams2026-04-21⚛️ gr-qc

AI--Assisted Exploration: DHOST Theories without Quantum Ghosts

This paper resolves the tension between higher-derivative quantum corrections and Ostrogradsky ghost instabilities in DHOST theories by proving that the algebraic conditions derived from gauge symmetry invariance are mathematically identical to the dynamical constraints required for Hamiltonian stability, thereby establishing symmetry principles as a robust tool for constructing ghost-free gravitational effective field theories.

Ginevra Braga, Raul Jimenez, Sabino Matarrese2026-04-21🔭 astro-ph

A First Investigation of Repeated-Signal Localization of Strongly Lensed Gravitational Waves for Multimessenger Astronomy

This paper demonstrates that combining multiple lensed images of strongly lensed gravitational wave sources significantly improves sky localization accuracy, with the most substantial gains achieved by merging just two images, thereby facilitating effective multimessenger follow-up and host galaxy identification.

Alvin K. Y. Li, Otto A. Hannuksela2026-04-21🔭 astro-ph

Quantum Reference Frames and Correlation Geometry

This paper offers a self-contained introduction to correlation geometry as the foundation of causal fermion systems, emphasizing its treatment of gauge transformations and unitary equivalence while arguing that this framework conceptually aligns more closely with thermodynamics than with standard quantum theory.

Claudio F. Paganini2026-04-21🔢 math-ph

Effective Trace Framework for Self-Similar Casimir Systems

This paper establishes a unified effective framework that decouples rigorous mathematical bounds from phenomenological models to describe the vacuum trace in self-similar Casimir systems, demonstrating that the integrated vacuum trace is proportional to the logarithmic running of a scale-dependent Casimir coefficient while distinguishing this macroscopic backreaction from local trace anomalies.

Goren Gordon2026-04-21⚛️ quant-ph

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