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 demonstrates that sustaining a constant electric field in de Sitter space necessitates a tachyonic photon mass, which, when incorporated into an on-shell renormalization scheme, resolves previous infrared divergences by yielding a finite, positive Schwinger current for both charged fermions and scalars.
The paper demonstrates that all physically viable models of New General Relativity, including TEGR and the Hayashi-Shirafuji model, inevitably exhibit divergences in torsion scalars at local horizons, thereby obstructing their interpretation as valid black hole configurations.
This study employs a hierarchical Bayesian framework to analyze simulated gravitational wave data from binary neutron star mergers, demonstrating that a linear logarithmic relation between tidal deformability and quadrupole moment is sufficient for future measurements and can constrain the characteristic length of dynamical Chern-Simons modified gravity to 10 km or less.
This paper resolves thermodynamic ambiguities in four-dimensional charged de Sitter black holes by adopting a Bousso-Hawking normalization relative to a freely-falling observer, revealing that while the near-extremal Nariai limit avoids a breakdown of the semi-classical description due to finite heat capacity, fundamental statistical limitations persist in the cold and ultracold regimes where the heat capacity vanishes.
This paper extends a previously developed generally covariant formalism to incorporate the diffusion of conserved charges, while clarifying the apparent distinction between chemical potential and diffusion terms.
This paper constructs a nonperturbative Kontorovitch-Lebedev-Fourier (KLF) momentum space for quantum field theory on de Sitter spacetime, where the dS frequency serves as a unitary representation label, thereby transforming equations of motion into algebraic forms and streamlining the computation of in-in correlators and loop integrals through a group-theoretical framework.
This paper investigates a modified gravity model inspired by a generalized mass-to-horizon entropy relation, demonstrating that it successfully distinguishes itself from standard CDM frameworks by altering cosmic expansion and structure formation dynamics while satisfying thermodynamic equilibrium requirements.
This paper presents the first 3D GRMHD simulation of accretion onto a horizonless JMN-1 singularity, demonstrating that while it mimics black hole observations like M87*, it can be distinguished by detectable emission from within the shadow that would be hidden behind an event horizon.
This paper introduces a specific ansatz for force-free electrodynamics in Minkowski spacetime that reduces the nonlinear system to a semilinear scalar wave equation, enabling the derivation of explicit time-dependent solutions, including finite-energy type-changing configurations and null kinks, while characterizing minimal field-sheet foliations for traveling waves in the magnetically dominated regime.
This paper employs the Dirac-Bergmann algorithm to demonstrate that introducing fixed external currents into Seiberg-Witten mapped non-commutative electrodynamics creates a source-compatibility obstruction located within the Dirac constraint chain, which typically resolves by fixing the primary multiplier rather than generating new constraints, thereby limiting a complete reduced-phase-space analysis to specific first-class subcases.