2615 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 derives a systematic framework for one-loop effective potentials in curved spacetimes and demonstrates that, for scalar theories in de Sitter and anti-de Sitter backgrounds, the computed -functions and anomalous mass dimensions coincide exactly with their flat-space counterparts despite significant curvature-induced modifications to physical masses and couplings.
This paper provides a comprehensive review of analogue Hawking radiation in nonlinear quantum optics, outlining the theoretical concepts of the gravitational analogy and chronicling the timeline of key fiber-optical experiments from 2008 to the present.
This paper demonstrates within the holographic QCD framework that the ground state in a strong magnetic field and finite baryon density is a chiral soliton lattice, which is interpreted as uniformly distributed D4-branes and unified through five-dimensional instanton charge, leading to a magnetic-field-dependent pion decay constant that qualitatively agrees with lattice QCD results.
This paper investigates how modeling quark deconfinement in neutron stars via higher-order phase transitions, rather than a traditional first-order transition, influences binary merger dynamics and the interpretation of future gravitational wave observations.
This paper demonstrates that the trace-free Einstein tensor cannot be derived from any local action functional via variation with respect to the metric, even when the requirement of diffeomorphism invariance is removed.
This study utilizes fully general relativistic numerical simulations of charged binary black hole mergers to demonstrate that while electric charge significantly alters the inspiral phase, it only mildly affects ringdown mode amplitudes, suggesting that previous estimates of charge detectability were overestimated and highlighting the necessity of including higher modes for future analyses with next-generation detectors.
This paper employs the scalar field as a time variable to deparametrize and nonperturbatively quantize scalar-tensor gravity using loop quantum gravity techniques, revealing that in the resulting Brans-Dicke cosmological model, the classical big bang singularity is resolved and replaced by a quantum bounce.
This paper presents an improved methodology for testing general relativity using gravitational waves, featuring group velocity parametrization and enhanced sampling, which yields tighter constraints on modified dispersion relations and a reduced upper bound on the graviton mass when reanalyzing GWTC-3 events, while finding no evidence for violations of general relativity for negative momentum exponents.
This paper resolves the ambiguity of field space geometry in gravitational effective field theories by developing a frame-covariant framework that interprets conformal frames as distinct foliations of a higher-dimensional auxiliary geometry, thereby demonstrating that key Swampland Distance Conjectures are universal consequences of frame covariance rather than specific quantum gravity constraints.
This paper investigates how a time-dependent Newton constant and non-conserved energy-momentum tensor, constrained by the Bianchi identity and thermodynamic principles, lead to specific power-law relations between and black hole mass that determine the black hole's evaporation behavior and temperature evolution based on the chosen entropy definition.