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 horizon-brightened acceleration radiation for freely falling two-level atoms in a Bardeen regular black hole geometry, demonstrating that the excitation spectrum remains Planckian with a temperature set by the Bardeen Hawking temperature while showing that the radiation is strongly suppressed as the black hole approaches an extremal, cold remnant limit.
This paper proposes that replacing the cosmological constant with the thermal energy of an expanding vacuum, characterized by the Gibbons-Hawking temperature, resolves the Hubble tension within a modified inflationary CDM framework.
This paper applies the Generalized Entropy Varying-G (GEVAG) framework to investigate early-time cosmology with logarithmic entropy corrections, demonstrating that a positive correction coefficient naturally facilitates slow-roll inflation and ameliorates the "arrow of time" problem while avoiding sudden singularities that plague constant- models.
This paper investigates the coupling of General Relativity with Nonlinear Electrodynamics to address axial singularities in four-dimensional black strings, proving that regular purely electric configurations are impossible for Lagrangians recovering the Maxwell limit while simultaneously constructing and validating new exact regular solutions, such as cylindrical analogues of the Bardeen and Hayward metrics, that satisfy causality and unitarity constraints.
This paper analyzes energy conditions in nonsingular bouncing cosmologies within quadratic curvature gravity coupled to a scalar field, revealing that while the scalar-field description satisfies most conditions except the strong one, the effective energy-momentum tensor approach violates all four conditions near the bounce, thereby highlighting the intrinsically non-Einsteinian nature required to avoid initial singularities.
This paper establishes sufficient conditions for "entanglement transference," a phenomenon where global entanglement decomposes into perspectival entanglement and coherence, demonstrating that in non-inertial quantum reference frames, entanglement degradation can be offset by increased coherence resources.
This paper demonstrates that combining LISA observations of extreme mass-ratio inspirals at low redshifts with massive black hole binaries at high redshifts significantly reduces cosmological degeneracies, yielding competitive constraints on the Hubble constant and dark-energy equation of state.
This paper investigates how viscosity affects the radial oscillations and gravitational collapse thresholds of cold, spherically symmetric neutron stars within both Eckart and BDNK hydrodynamic frameworks, finding that viscosity damps oscillations on millisecond timescales and shifts frequencies by up to the percent level without being able to stabilize an otherwise unstable star against collapse.
This paper demonstrates that dynamical dark energy theories, exemplified by the cubic Galileon model, induce cosmological "hair" around black holes that significantly alters their ringdown quasi-normal mode spectrum, enabling future gravitational wave detectors like LVK and LISA to constrain dark energy field profiles with high precision.
This paper derives a rotating Generalized Uncertainty Principle (GUP) black hole metric using the modified Newman-Janis algorithm, analyzes its thermodynamic properties and singularity structure, and constrains its quantum parameters by comparing the predicted shadow with Event Horizon Telescope observations of M87* and Sgr A*.