4429 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.
By comparing 3D global HD and MHD simulations of circumbinary disks, this study reveals that MRI-driven turbulence generates a gas torque 3.5 times larger and more variable than standard -viscosity models, significantly altering predictions for gravitational-wave dephasing in LISA binaries and accretion variability signatures for LSST and Roman.
This paper demonstrates that while critical Higgs inflation can individually satisfy electroweak constraints and reproduce CMB observables through appropriate parameter tuning, no region of its parameter space simultaneously fulfills all three physical criteria, implying that its predictions remain inherently sensitive to unknown ultraviolet physics.
This study analyzes molecular gas velocities in nearby star-forming galaxies to demonstrate that recurring intermittency signatures and nonlinear scaling relations support a hierarchical turbulent model, specifically a generalized She-Leveque hierarchy, across scales from individual clouds to entire galaxies.
This study extends machine-learning-based equation of state classification for core-collapse supernovae from individual detectors to networks, demonstrating that while current and future detector configurations significantly influence classification performance and sky coverage, network additions improve uniformity and third-generation observatories can extend the reach to 100 kpc for favorable orientations.
This paper presents the first accurate computation of quasinormal-mode frequency shifts in rapidly rotating black holes surrounded by massive, nonminimally coupled scalar fields, enabling the use of existing gravitational-wave signals to search for ultralight dark-matter candidates.
This paper investigates finite-time vacuum energy relaxation in conformally coupled scalar-tensor cosmology with power-law gravity, deriving a conservative upper bound that demonstrates the system cannot achieve 60 decades of suppression within 60 e-folds from specific initial conditions, while highlighting the critical role of transient dynamics that are not captured by asymptotic attractor analysis.
This paper derives closed-form Quantum Energy Inequality bounds for massless scalar and electromagnetic fields along stationary worldlines in Minkowski spacetime by optimizing over tetrads with constant angular velocity, revealing that while Fermi-Walker tetrads yield the tightest bounds for the electromagnetic field, they do not necessarily do so for scalar fields, thereby significantly improving upon previous results that were limited to Frenet-Serret tetrads.
Through three-dimensional lattice simulations of strong first-order phase transitions in an expanding Universe, this study reveals that sound waves dominate the gravitational wave signal over bubble collisions, exhibit distinct spectral peaks and lifetime dependencies on transition strength, and produce normalized amplitudes roughly an order of magnitude smaller than those predicted in Minkowski spacetime.
This paper argues that the viability of ultralight scalars and invisible gravitons depends critically on the post-inflationary expansion timeline, specifically requiring that the decelerated phase be slower than radiation to avoid conflicts with large-scale observations while simultaneously constraining the duration of such stages and the mass range of the scalars through Big Bang nucleosynthesis and high-frequency graviton spectra.
This paper investigates the characteristic modes of non-minimally coupled thick branes with single-kink and deformed scalar configurations, demonstrating that while the graviton zero mode is localized in both models, the deformed brane exhibits resonant Kaluza-Klein modes whose properties are closely correlated with the quasinormal modes calculated via independent frequency and time domain methods.