2615 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 demonstrates that the semiclassical Einstein equations naturally emerge from the proportionality between quantum relative entropy and horizon area variations, thereby generalizing Jacobson's thermodynamic derivation by replacing classical entropy with well-defined quantum information measures.
This paper establishes a correspondence between the gravitational phase space at null infinity and the subleading phase space around finite-distance null hypersurfaces using the Newman-Penrose formalism, thereby identifying celestial symmetries, defining covariant radiation, and revealing an infinite tower of conserved charges relevant to observers near black hole or cosmological horizons.
Challenging previous conclusions that curvature enhances entanglement, this paper demonstrates that while increasing curvature in de Sitter spacetime strengthens correlations between local field modes, it paradoxically decreases their entanglement, revealing a qualitative alteration of the vacuum's entanglement structure by the cosmological constant.
This paper proposes and experimentally validates a novel "Phase-Modulated-sideband × Phase-Modulated-sideband Wave Front Sensing" (PMPMWFS) technique for gravitational-wave detectors, which demodulates signals at the difference frequency between two anti-resonant sidebands to effectively decouple Power Recycling Cavity and incident beam alignment from arm cavity signals, thereby enabling stable, multi-degree-of-freedom control.
This paper explores the physics of nanohertz gravitational wave signals recently detected by pulsar timing arrays, examining their potential astrophysical origins from massive black-hole binaries and cosmological origins from early Universe phenomena to constrain high-energy physics and deepen our understanding of the cosmos.
This paper presents a preliminary forecast demonstrating that the future space-borne LISA detector can distinguish the gravitational wave signals of eccentric extreme-mass-ratio inspirals carrying a scalar charge within non-vacuum environments (such as accretion disks and dark matter halos) from vacuum signals, potentially constraining the scalar charge with a relative error of approximately 0.1.
This paper reports the first sub-solar mass compact binary search using LIGO's O4a data, which found no significant candidates but established the tightest constraints to date on merger rates and local dark matter fractions, significantly improving upon previous limits from earlier observing runs and microlensing surveys.
This paper demonstrates that in Rastall gravity, the non-minimal coupling between matter and geometry significantly alters the collapse threshold and exponential abundance of primordial black holes, establishing them as sensitive probes for testing modified gravity theories within current cosmological constraints.
This paper demonstrates that perturbations from passing gravitational waves on a Schwarzschild-MOG black hole produce two unique, time-dependent signatures—a rhythmic "breathing" of the shadow's area and an asymmetric "wobble" caused by massive vector field delays—that distinguish Modified Gravity from General Relativity and offer a testable template for next-generation interferometry.
This paper investigates the extended thermodynamics of charged Hayward-AdS black holes surrounded by a cloud of strings and perfect fluid dark matter, demonstrating that these models exhibit van der Waals-like phase transitions, distinct Joule-Thomson expansion characteristics, and holographic heat engine efficiencies that are respectively enhanced by the cloud of strings and diminished by perfect fluid dark matter.