3949 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 proposes GravNet, a conceptual design for a global network of geographically separated detectors operating in strong magnetic fields to search for high-frequency gravitational waves (MHz to GHz) by synchronizing measurements to distinguish signals from noise and enhance detection significance.
This paper argues that while conventional quantum mechanics requires an anti-unitary time-reversal operator in orientable spacetimes to preserve energy positivity and commutation relations, spacetimes with non-orientable topology enable a purely unitary time-reversal operator by encoding the symmetry through geometry, thereby allowing for negative energy states.
This paper proposes a simple spin-measurement technique for M87* that utilizes high-resolution astrometry to detect the displacement between the direct image and the first lensed photon ring sub-image, demonstrating that a relative resolution of can constrain the black hole's spin to within 9–26% without relying on geometric modeling of the emission.
By modeling a collapsing matter shell within an effective quantum field theory where Planck length fluctuations are retained until the final limit, the paper demonstrates that finite particle production prevents the scalar expansion parameters from vanishing, thereby suppressing the formation of an apparent horizon and suggesting that astrophysical black holes may be regular, horizonless compact objects.
This paper computes the one-loop contribution to the semiclassical partition function of static, charged near-extremal black holes in five-dimensional Einstein-Gauss-Bonnet gravity, revealing that tensor, vector, and gauge fluctuations induce universal logarithmic corrections to the entropy with a low-temperature scaling of .
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 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 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.