3285 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 investigates how anisotropic primordial power spectra from specific inflation models, such as Finslerian and gauge field inflation, influence scalar-induced gravitational waves, concluding that current pulsar timing array observations cannot yet rule out the existence of small-scale anisotropic primordial perturbations.
This paper extends the standard cosmological model within the quadratic energy-momentum squared gravity framework to analyze Big Bang Nucleosynthesis dynamics, deriving stringent constraints on the interaction parameter from primordial helium abundance measurements that either align with or deviate from standard cosmology depending on the dataset used.
This paper presents a visual approach to relativistic mechanics using Minkowski diagrams in energy-momentum space and hyperbolic trigonometry to derive elegant new formulations of the relativistic rocket equation and Doppler effect.
This paper establishes a mathematical framework for signature-changing manifolds with a transverse radical, demonstrating that such spacetimes inherently admit closed pseudo-timelike loops that reverse time direction and prevent a consistent causal distinction between future and past, offering a geometric interpretation of particle-antiparticle pair creation near the origin of time.
This paper presents a general procedure for calculating gravitational wave backgrounds from cosmic string loops with evolving shapes due to gravitational backreaction, revealing that such backgrounds are 3% to 30% lower than prior predictions and providing updated comparisons for current and future detectors.
This paper introduces PT2GWFinder, a Mathematica package that automates the computation of phase transition parameters and gravitational wave spectra for arbitrary scalar theories exhibiting first-order phase transitions, featuring integration with DRalgo for high-temperature effective potentials and validated through analytical and numerical case studies.
This study presents general relativistic magnetohydrodynamic simulations demonstrating that the lifetime of a metastable massive neutron star remnant critically shapes the polar outflow environment, thereby significantly influencing the propagation and final properties of the subsequent black hole-driven jet in binary neutron star mergers.
This paper establishes a unified framework for nonlinear and nonadiabatic transport phenomena by introducing a momentum-space nonadiabatic metric tensor derived from Bloch electron evolution, which generates geometric and geodesic velocity corrections and recasts wave packet dynamics as forced geodesic motion in curved momentum space.
This paper demonstrates that superrotation charges, which are formally ill-defined due to singularities at a point in both Bondi and Penrose formalisms, can be rendered well-defined through a regularization procedure devised by Flanagan and Nichols.
This paper investigates primordial black hole formation during an early matter-dominated era, concluding that despite shape-dependent threshold variations, the required large amplitude of primordial fluctuations makes this mechanism barely more efficient than in radiation domination and predicts a slightly larger but still small dimensionless spin parameter.