3273 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 a background magnetic field modifies the critical behavior and fine structure of photon rings around a rotating black hole in Kerr-Bertotti-Robinson spacetime by analyzing unstable spherical orbits and deriving key parameters that characterize radial compression, azimuthal advancement, and time delay for various observer configurations.
This paper investigates how holonomy corrections in loop quantum gravity, encoded by the parameter , influence the horizons, timelike geodesic motions, and gravitational wave emissions of rotating black holes, revealing that increasing significantly alters orbital dynamics and enhances waveform deviations near the event horizon.
This paper uses fully general-relativistic simulations to demonstrate that binary neutron star mergers involving a subsolar-mass neutron star exhibit unique tidal deformabilities and enhanced dynamical ejecta, yet remain detectable by current gravitational wave observatories without significant parameter bias, despite discrepancies with existing waveform models.
This paper investigates the observational consequences of a fractional Schwarzschild-Tangherlini black hole with a fractal horizon by analyzing Shapiro and Sagnac time delays, shadows, orbital precession, and gravitational lensing against empirical data, ultimately demonstrating the metric's viability in solar-system tests and the necessity of exploring fractional spacetimes.
This paper identifies and clarifies two compensating sign errors in the 1973 Bardeen-Carter-Hawking paper on black hole mechanics, demonstrating that while the definitions of total particle number and entropy were missing minus signs and the mass formula equations had incorrect signs, these errors canceled each other out, leaving all original conclusions valid.
This paper investigates the optical and radiative signatures of an accretion disk around a Schwarzschild black hole immersed in a uniform magnetic field within the Schwarzschild-Bertotti-Robinson spacetime, revealing that increasing magnetic field strength expands key characteristic radii, contracts the observed direct image, and dramatically reduces radiative efficiency by up to 91%.
This paper derives an equidistant, discrete spectrum for the black hole horizon area operator in theories with non-minimally coupled scalar fields using the weak isolated horizon formalism, demonstrating that horizon geometry is inherently discrete independent of specific quantum gravity theories and yielding black hole entropy consistent with the Bekenstein-Mukhanov proposal.
This paper introduces a new non-parametric method to constrain the ratio between gravitational-wave and electromagnetic-wave luminosity distances, which, when applied to GWTC-3 binary black hole merger data, yields results consistent with General Relativity and previous parametric analyses.
Motivated by a one-cycle cosmological scenario where the Big Bang emerges from a Euclidean regime, this paper proposes that black holes could serve as entry portals to such a realm, requiring them to contain de Sitter cores and a spacelike shell of non-inflationary matter to ensure metric regularity.
By developing a gravitational-wave waveform model that incorporates a slowly varying gravitational constant and applying it to a joint multi-messenger analysis of the binary neutron star merger GW170817, this study finds no evidence for temporal variation in and establishes the most stringent constraints to date on its fractional time derivative, thereby validating the strong equivalence principle in the relativistic regime.