3151 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 computes the quadrupolar gravitational waveform for two-mass scattering at third-and-a-half post-Newtonian accuracy using the Multipolar Post-Minkowskian formalism, explicitly evaluating frequency-domain contributions up to the 2-loop level and confirming consistency with existing Effective Field Theory results after accounting for supertranslation frame differences.
This paper proposes a model of fermion condensate inflation driven by spacetime torsion that eliminates the need for new scalar fields, utilizes an axial chemical potential to trigger a dynamical waterfall mechanism and instant preheating, and generates primordial black holes from Q-ball seeds within a parity-violating Chern-Simons gravity framework.
This paper proposes a model in 2+1 dimensions where the black hole horizon is composed of quantized elementary lengths, enabling a length ensemble formulation that directly derives the Hawking black body spectrum and its modified temperature for a local observer via the Tolman factor.
This paper investigates the shadow, geodesic structure, and radiation properties of a regular black hole embedded in a Dehnen-type dark matter halo, using M87* and Sgr A* observations to constrain its model parameters and demonstrating that increasing the parameter enlarges the accretion disk's effective radiation area while significantly enhancing image asymmetry and Doppler boosting effects.
This paper investigates the chaotic dynamics of charged particles around weakly magnetized black holes in Einstein-ModMax theory using a symplectic integrator and entropy-based indicators, revealing that while Shannon entropy and MIPP effectively distinguish orbital chaos, the system's dynamical transitions are less sensitive to specific model parameters than to conserved energy and angular momentum.
This paper investigates how primordial dipole-type statistical anisotropy affects the stochastic gravitational wave background detectable by pulsar timing arrays, deriving frequency-dependent overlap reduction functions and finding that current NANOGrav 15-year data yields no significant evidence for such anisotropy due to observational frequency limitations, though future broader-band datasets promise tighter constraints.
This paper investigates how gravitational inhomogeneity affects transport phenomena in a system of massless Dirac fermions coupled to both Maxwell and dark photon fields, revealing that the resulting currents are proportional to beta functions and predicting specific corrections to scale conductivities in both the visible and dark sectors.
This paper utilizes a semi-numerical model to demonstrate that primordial black holes, acting as seeds for early AGNs, significantly alter high-redshift 21-cm observables by shallowing the global signal depth and suppressing power spectrum amplitudes, with the specific impact heavily dependent on the chosen PBH mass function.
This paper proposes and tests a family of phenomenological cosmological models featuring an interacting dark sector modulated by a sparseness scale parameter, demonstrating through phase-space analysis and Bayesian constraints from multiple observational datasets that a nonzero sparseness scale is favored at over 95% confidence, thereby supporting its role in bounding energy exchange and preventing phantom crossing.
This paper investigates the infrared behavior of one-loop complex saddles in 4D Lorentzian Einstein-Hilbert gravity by computing the renormalized Hartle-Hawking wavefunction under Dirichlet and fixed extrinsic curvature boundary conditions, revealing that metric fluctuations induce secularly growing infrared divergences similar to those in pure Lorentzian de Sitter space, while confirming that all considered saddles remain KSW-allowed.