2593 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 develops a consistent field-based perturbation framework to analyze the impact of oscillating generalised axion-like quintessence fields on cosmic structure growth, demonstrating that the standard effective fluid description fails during this dynamical phase.
This paper proposes that interactions between gravitons and inflatons during the inflationary period, combined with horizon-induced "which-path" information, generate entangled graviton states that produce a measurable quantum signature in the scalar four-point correlation function, potentially observable through high-order galaxy correlations like halo bias and intrinsic alignment.
This paper proposes a method to test the quantum origin of primordial fluctuations by constructing a Bell inequality from the eight-point correlation function of scalar curvature perturbations, which encodes polarization entanglement from pairs of gravitons generated during inflation.
This paper demonstrates that while a first-order phase transition in Kerr extreme mass-ratio inspirals may not significantly hinder gravitational-wave detectability due to small overall waveform mismatches, the resulting large cumulative dephasing creates a bias-sensitive regime that compromises the faithfulness of precision parameter inference, thereby motivating the inclusion of transition sectors in future LISA waveform models.
This paper presents the largest narrowband continuous gravitational wave search to date in the advanced detector era, analyzing data from the first two parts of the fourth LIGO–Virgo–KAGRA observing run for 34 known pulsars (including binary systems) using the 5n-vector pipeline with expanded frequency derivative parameters, which yielded no detections but established stringent upper limits, including a tight constraint on the Crab pulsar at less than 0.04% of its spin-down power.
This paper demonstrates that relational observables in quantum gravity can be expressed as dressed operators, revealing that the algebraic structure of quasi-de Sitter space corresponds to a Type II von Neumann algebra due to isometry breaking, which fundamentally distinguishes it from the Type II algebra of de Sitter space.
This paper establishes that any non-quantized model of gravity consistent with Galilean invariance and Newtonian averages must introduce a quantifiable minimum level of noise, implying that observing gravity below this noise threshold would experimentally prove its ability to entangle massive objects and thus its quantization.
This paper constructs regular, horizon-free, and asymptotically flat traversable wormhole solutions inspired by noncommutative geometry by utilizing a nontrivial redshift function and reformulating the required exotic matter through quasi-de Sitter and Chaplygin-like equations of state to confine NEC violation to a thin neighborhood of the throat.
This paper investigates how new physics prior to recombination affects late-time dynamical dark energy models, finding that while such early-time solutions can alleviate the Hubble tension, they introduce severe conflicts with matter density constraints and render the evidence for phantom-crossing dark energy inconclusive.
The paper investigates the Brout-Englert-Higgs mechanism prior to symmetry breaking and demonstrates that the interaction between Higgs fields and massless gauge fields results in the production of particles with negative squared mass.