⚛️ Category

gr-qc

2558 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.

Strong-field signatures of a regular black hole in an Einasto dark matter halo

This paper investigates the strong-field signatures of a regular black hole embedded in an Einasto dark matter halo, revealing that while timelike orbital observables remain largely degenerate with the Schwarzschild limit, the photon sphere, shadow diameter, and optical appearance near the critical halo parameter provide the most sensitive probes for distinguishing this model from standard black holes, with current EHT observations of Sgr A* and M87* constraining the halo parameter to specific ranges.

Mohsen Fathi, Faizuddin Ahmed2026-04-30⚛️ gr-qc

H\mathcal{H}olographic N\mathcal{N}aturalness and Pre-Geometric Gravity

This paper proposes a unified resolution to the cosmological constant problem by integrating holographic naturalness and pre-geometric gravity, arguing that the stability of the de Sitter vacuum arises from an entropic barrier linked to a pre-geometric Higgs field that dynamically generates both spacetime geometry and the observed smallness of dark energy.

Andrea Addazi, Salvatore Capozziello, Giuseppe Meluccio2026-04-30⚛️ hep-th

Inflationary Scenarios in f(Q,ϕ)f(Q,\phi) Gravity with Scalar Field Coupling

This paper investigates inflationary scenarios in modified f(Q,ϕ)f(Q,\phi) gravity with nonminimal scalar coupling, demonstrating that while De Sitter inflation requires a tightly constrained coupling parameter (ξ∼10−3\xi \sim 10^{-3}) to match Planck data, the Cosh-type model offers a robust and observationally consistent description of inflation with predicted spectral index and tensor-to-scalar ratio values in excellent agreement with current constraints.

F. Mavoa, M. B. Barry, R. Ndioukane, M. G. Ganiou, F. K. Ahloui2026-04-30⚛️ gr-qc

Trapping, Irregular Waveforms, and Efficient Radiation in Ultra-relativistic Black Hole Encounters

Using numerical relativity, this study demonstrates that ultra-relativistic black hole encounters at high Lorentz factors (γ≈5.1\gamma \approx 5.1) enter a new regime characterized by prolonged, irregular gravitational wave emission and horizon absorption driven by transient null trapping, resulting in the radiation of over 65% of the system's initial energy.

Hengrui Zhu, Frans Pretorius, James M. Stone2026-04-30⚛️ gr-qc

Algebraic quantum kinematics and SR-selection

This paper establishes the first part of a six-paper series presenting an operator-algebraic framework that derives special relativity from non-relativistic quantum mechanics by analyzing the photon sector of free QED, distinguishing the roles of constants cc and ℏ\hbar, and proposing the "SR-selection conjecture" which posits that the transition to a relativistic Haag-Kastler net is structurally obstructed in the Galilean case.

Leonardo A. Pachon2026-04-30🔢 math-ph

Newton-Cartan limit of Klein-Gordon AQFT and the collapse of Galilean modular structure

This paper extends the known absence of Reeh-Schlieder and Tomita-Takesaki modular flow in Galilean algebraic quantum field theory to curved Newton-Cartan backgrounds by demonstrating that the c→∞c \to \infty limit of the free Klein-Gordon field yields a Galilean net where the gravitational potential influences the Hamiltonian but fails to restore the modular structure obstructed by the Bargmann central charge.

Leonardo A. Pachon2026-04-30🔢 math-ph