3322 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.
This paper establishes an axiomatic framework for the continuum limit of spin foam amplitudes, demonstrating that while strong convergence inevitably leads to a topological theory, a distributional approach inspired by Refined Algebraic Quantisation successfully yields a well-defined physical Hilbert space and interprets the gravitational path integral as a rigging map.
This paper introduces a highly efficient, near-optimal logarithmically-binned estimator that directly reconstructs the inflationary bispectrum shape function from Planck data, enabling rapid, millisecond-scale comparisons with over 20,000 theoretical models and revealing a 2.6σ hint of spin-two particle exchange.
This paper demonstrates that in Einstein-Nonlinear-Electrodynamics models depending on two electromagnetic invariants, vacuum birefringence causes photons to follow two distinct paths, resulting in a single black hole casting two separate shadows and allowing researchers to constrain the charge-to-mass ratio of Sagittarius A* based on this phenomenon.
This paper investigates false vacuum decay catalyzed by dilaton black holes in a thermal bath by analytically constructing tunneling solutions for small field excitations and identifying non-thermal sphaleron configurations for large excitations, thereby providing insights into vacuum decay induced by primordial black holes in the early universe.
This paper utilizes a fully relativistic pipeline to quantify how the Laser Interferometer Space Antenna (LISA) will detect and characterize Intermediate and Extreme Mass Ratio Inspirals, revealing that while IMRIs are robust against instrument degradation, the full mission duration significantly enhances EMRI detection horizons and parameter precision, thereby enabling stringent tests of strong-field gravity and alternative theories.
This paper proves that the EPRL amplitude for any 4-ball region, based on the original vertex and specific face amplitudes, is supported exclusively on flat connections, a result established generally without relying on semiclassical analysis.
This paper constructs a Majorana-based , superspace formalism for the Kalb-Ramond topological term that reveals new bosonic and fermionic contributions, including a supersymmetric Chern-Simons-like coupling, which upon compactification shifts the Kaluza-Klein mass spectrum and offers novel implications for torsion phenomenology in Randall-Sundrum models.
This paper presents the first fully analytical single-field inflation model featuring a smooth transition from slow-roll to ultra-slow-roll phases, achieved by introducing a time-dependent effective mass term that maintains a continuously varying second slow-roll parameter while enabling precise tracking of the curvature power spectrum's parameter dependence.
This paper presents a model-independent framework that combines artificial neural networks with Type Ia supernovae to calibrate Gamma-Ray Burst luminosity relations, thereby overcoming the circularity problem and extending cosmological distance measurements to high redshifts () to constrain parameters in both CDM and CDM models.
This paper utilizes Fisher analysis and mock-data studies to forecast the sensitivity of Pulsar Timing Arrays to modified dispersion relations in gravitational waves, predicting that approximately 30 years of observations will be required to detect deviations in the speed of light at the 3σ level.