⚛️ Category

gr-qc

3256 papers

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.

Searches for Continuous Gravitational Waves from Supernova Remnants in the first part of the LIGO-Virgo-KAGRA Fourth Observing run

Using data from the first eight months of the LIGO-Virgo-KAGRA O4 run, this study conducted the most sensitive wide-band directed searches to date for continuous gravitational waves from 15 nearby supernova remnants, finding no evidence of signals and establishing the most stringent upper limits on intrinsic strain amplitude, neutron star ellipticity, and rr-mode amplitudes for these sources.

The LIGO Scientific collaboration, the Virgo collaboration, the KAGRA collaboration2026-03-30⚛️ gr-qc

Binary neutron star mergers with tabulated equations of state in SPHINCS_BSSN

This paper introduces and evaluates three new conservative-to-primitive variable conversion algorithms for the SPHINCS_BSSN Lagrangian numerical relativity code, establishing a robust hybrid strategy that defaults to a fast 3D Newton-Raphson method while utilizing a fail-safe 1D Ridders' method to efficiently handle tabulated equations of state in binary neutron star merger simulations.

Swapnil Shankar, Stephan Rosswog, Peter Diener2026-03-30🔭 astro-ph

Tracing the Evolution of Ωm(z)\Omega_m(z) over the Last 10 Billion Years with Non-parametric Methods

This study uses Gaussian Process Regression to non-parametrically reconstruct the redshift evolution of the matter density parameter Ωm(z)\Omega_m(z) over the last 10 billion years, finding that while its evolution aligns with the standard Λ\LambdaCDM model, the inferred present-day value Ωm0\Omega_{m0} is highly sensitive to uncertainties in galaxy cluster mass calibration.

R. F. L. Holanda, J. F. Jesus, Z. C. Santana, R. C. Nunes2026-03-30🔭 astro-ph

A Bell Experiment in an Entangled Universe

This paper proposes that interactions between gravitons and inflatons during the inflationary period, combined with horizon-induced "which-path" information, generate entangled graviton states that produce a measurable quantum signature in the scalar four-point correlation function, potentially observable through high-order galaxy correlations like halo bias and intrinsic alignment.

Pablo Tejerina-Pérez, Daniele Bertacca, Raul Jimenez, Leonid Sarieddine2026-03-30🔭 astro-ph

A Bell experiment during inflation: probing quantum entanglement in tensor fluctuations through correlations of primordial scalar curvature perturbations

This paper proposes a method to test the quantum origin of primordial fluctuations by constructing a Bell inequality from the eight-point correlation function of scalar curvature perturbations, which encodes polarization entanglement from pairs of gravitons generated during inflation.

Pablo Tejerina-Pérez, Leonid Sarieddine, Daniele Bertacca, Raul Jimenez2026-03-30🔭 astro-ph

Detectability and Systematic Bias from First-Order Phase-Transition Dephasing in Kerr EMRIs

This paper demonstrates that while a first-order phase transition in Kerr extreme mass-ratio inspirals may not significantly hinder gravitational-wave detectability due to small overall waveform mismatches, the resulting large cumulative dephasing creates a bias-sensitive regime that compromises the faithfulness of precision parameter inference, thereby motivating the inclusion of transition sectors in future LISA waveform models.

Jingxu Wu, Liangyu Luo, Junyi Zhang, Jiyun Yang, Haoxiang Ma, Jie Shi2026-03-30⚛️ gr-qc

Narrowband searches for continuous gravitational waves from known pulsars in the first two parts of the fourth LIGO--Virgo--KAGRA observing run

This paper presents the largest narrowband continuous gravitational wave search to date in the advanced detector era, analyzing data from the first two parts of the fourth LIGO–Virgo–KAGRA observing run for 34 known pulsars (including binary systems) using the 5n-vector pipeline with expanded frequency derivative parameters, which yielded no detections but established stringent upper limits, including a tight constraint on the Crab pulsar at less than 0.04% of its spin-down power.

The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration, A. G. Abac, I. Abouelfettouh, F. Acernese, K. Ackley, A. Adam, C. Adamcewicz, S. Adhicary, D. Adhikari, N. Adhika (…)2026-03-30⚛️ gr-qc