2532 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 unifies previous work on anisotropic cosmologies by deriving perturbations of the Friedmann equations for spatially homogeneous Bianchi models, combining them into a characteristic partial differential equation, and using it to simulate the Cosmic Microwave Background power spectrum for a Bianchi V toy model.
This paper presents the first analytic example of a five-dimensional singly rotating near-horizon solution in Einstein-Gauss-Bonnet gravity where the Gauss-Bonnet term eliminates local curvature singularities to yield finite invariants, provided the rotation parameter stays below a coupling-dependent threshold, while also revealing unique challenges for standard thermodynamic descriptions.
This paper develops a formalism for coupling matter to continuous spin gravity and calculates time-delay signatures in gravitational wave detectors, suggesting that current and future instruments could constrain the continuous spin scale to be below eV for ground-based interferometers and eV for pulsar timing arrays.
This paper demonstrates that a toy FRW universe with topology and specific quantum field content supports consistent semi-classical Friedmann equations with temporal periodicity, leading to cyclic entropy reversals that align with Hawking's proposed link between thermodynamic and cosmological arrows of time.
This paper presents a validated semi-analytic waveform model for black hole binaries in scalar environments, which is applied to LIGO-Virgo-KAGRA data to set upper limits on scalar densities and identify tentative evidence for a light scalar field around the GW190728 event.
This paper establishes new quasi-universal relations between static and dynamical tidal deformabilities of neutron stars that remain robust across diverse equations of state, thereby providing a simplified framework for incorporating dynamical tidal effects into gravitational-wave modeling while demonstrating that a one-mode approximation outperforms Taylor expansions in capturing the frequency-dependent response.
This paper establishes the first exact correspondence between Einstein-scalar-Maxwell theory and gauged Skyrme-Maxwell-Einstein models, enabling the transfer of electrovacuum solution-generating techniques to construct new exact solutions with nonvanishing baryonic charge, including a rotating configuration where baryonic charge quantization enforces a quantization of the Kerr rotation parameter.
This paper establishes a phase-resolved field-space distance budget for non-inflationary cosmologies, deriving new constraints on ekpyrotic and bouncing models by integrating anisotropy suppression, quantum gravity-inspired cutoffs, and observational limits to demonstrate that achieving scale-invariant perturbations with a red tilt necessitates ultra-fast-roll dynamics, sharp turns, or significant negative field-space curvature.
This study utilizes Ruppeiner thermodynamic geometry in the grand canonical ensemble to demonstrate that quintessence-adorned Reissner-Nordström Anti-de Sitter black holes exhibit a unique transition from dominant attractive to repulsive microscopic interactions as electric potential increases, while maintaining constant interaction strength during phase transitions.
This paper compares "fast" and "slow" light propagation prescriptions for simulating black hole movies, demonstrating that significant discrepancies arise when source variability is rapid, and proposes an intermediate "brisk light" method that efficiently preserves the dominant temporal signatures of strong lensing for future space-based VLBI observations.