⚛️ Category

gr-qc

3826 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.

🔭 astrophysics

Testing the Direction of Dark Sector Interaction Using Late-Time Datasets

Using late-time datasets including DESI DR1/DR2, cosmic chronometers, CMB, and various supernova compilations, this study finds that while the interacting dark energy model slightly alleviates the Hubble tension and suggests a weak preference for energy transfer from dark energy to dark matter, the data ultimately provide no statistically significant evidence for dark sector interaction and consistently favor the standard Λ\LambdaCDM model.

Anil Kandel, Phongpichit Channuie, Ertan Güdekli, Farruh Atamurotov2026-07-15
🔬 atomic physics

High-Frequency Gravitational Wave Constraints from Precision Spectroscopy

This paper presents the first constraints on high-frequency gravitational waves in much of the 100 kHz to 100 MHz range, although parts of this region have been previously probed by the Holometer and bulk acoustic wave devices. By utilizing optical precision spectroscopy to detect the modulation of photon frequencies in laser cavities, this method offers a path toward significantly enhanced sensitivity and an extended detectable frequency range of at least 1 GHz.

Dmitry Budker, Valerie Domcke, Joachim Kopp, Oleg Tretiak2026-07-15✓ Author reviewed ⓘ
⚛️ nuclear theory

Two-fluid ff-mode oscillations of dark-matter-admixed neutron stars

This study investigates quadrupolar ff-mode oscillations of dark-matter-admixed neutron stars in full general relativity, revealing that intermediate dark matter fractions can induce a weakly radiating oscillation branch with significantly enhanced damping times, thereby refining previous models by incorporating metric perturbations and radiative boundary conditions.

Zi-Yue Zheng, Ting-Ting Sun, Huan Chen, Xiao-Ping Zheng, Jin-Biao Wei, G. F. Burgio, H. -J. Schulze2026-07-15
⚛️ general relativity

Evaluating KAGRA upgrade scenarios for multimessenger observations of binary neutron stars

This paper presents a computationally efficient framework to evaluate KAGRA upgrade scenarios for multimessenger astronomy, revealing that while high-frequency optimizations improve sky localization for individual sources, broadband upgrades yield more well-localized events overall, and KAGRA's inclusion significantly increases the number of detectable binary neutron star mergers within a 1000 Mpc³ volume.

Yuta Michimura, Soichiro Morisaki, Kenta Hotokezaka, Masaomi Tanaka2026-07-15
⚛️ general relativity

The entropy of dynamical black holes deviating from electrovacuum in second order

This paper demonstrates that for dynamical black holes in Einstein–Maxwell theory deviating from electrovacuum, the entropy remains proportional to the apparent horizon area and satisfies the second law up to second-order perturbations under the null energy condition, by utilizing a modified canonical energy within the covariant phase space formalism.

Wen-Tao Fu, Ming-Fei Ji, Yu-Sen Zhou, Li-Ming Cao2026-07-15
⚛️ general relativity

Inflaton Dynamics in Higher-Derivative Scalar-Tensor Theories of Gravity

This paper investigates higher-derivative corrections in scalar-tensor theories where the inflaton is the additional scalar degree of freedom, finding that while non-linear dynamics generally resemble General Relativity, driving the system out of the weak-coupling regime requires fine-tuning and is therefore unlikely to occur generically.

Sam E. Brady, Katy Clough, Pau Figueras, Áron D. Kovács2026-07-14