Hep-Th, or high-energy theoretical physics, explores the fundamental building blocks of our universe and the forces that govern them. Researchers in this field use complex mathematics to understand everything from subatomic particles to the behavior of black holes, often pushing the boundaries of what we know about space and time.

At Gist.Science, we monitor the arXiv repository to ensure you stay ahead of the curve in this rapidly evolving discipline. For every new preprint uploaded to arXiv under this category, our team generates both accessible plain-language overviews and detailed technical summaries, making cutting-edge research understandable regardless of your background.

Below are the latest papers in high-energy theoretical physics, curated to help you navigate the most significant recent discoveries.

The Influence of Stable Photon Sphere Advent on Orbital Precession in moving towards the Extremality: Periapsis Shift as a Gateway to the Weak Gravity Conjecture

This paper investigates how dynamic mass variations and the presence of a stable photon sphere near extremal black holes alter orbital periapsis shifts, demonstrating that these qualitative changes in strong-field orbital behavior serve as a viable experimental probe for the Weak Gravity Conjecture.

Mohammad Ali S. Afshar, Jafar Sadeghi2026-06-03⚛️ gr-qc

Exceptional Lines and Excitation of (Nearly) Double-Pole Quasinormal Modes: A Semi-Analytic Study in the Nariai Black Hole

This paper provides a semi-analytic study of the Nariai limit in Kerr-de Sitter and Myers-Perry black holes to demonstrate that massive scalar field quasinormal modes form an exceptional line in parameter space, leading to unique excitation phenomena such as destructive interference and transient linear growth near these double-pole frequencies.

Nao Nakamoto, Naritaka Oshita2026-06-03⚛️ gr-qc

Thermal Metastable Strings in One-Scale Models and Gravitational Waves

This paper demonstrates that thermal effects in a minimal one-scale dark-sector gauge theory significantly alter the decay dynamics of metastable ZZ-strings by favoring thermally induced nucleation over zero-temperature monopole nucleation, thereby shifting the viable parameter space for explaining the nanohertz gravitational wave background observed by Pulsar Timing Arrays toward lower dark fine-structure constants and higher monopole-to-string-tension ratios.

Arturo de Giorgi, James Ingoldby, Valentin V. Khoze, Jessica Turner2026-06-03⚛️ hep-ph

Perturbative construction of amplitudes from on-shell trees with vacuum pairs: the all-plus four-gluon amplitude through order g6\boldsymbol{g}^{\boldsymbol{6}}

This paper proposes a fixed-order perturbative on-shell construction of scattering amplitudes using BCFW-generated trees and integrated vacuum pairs, successfully reproducing the known one- and two-loop all-plus four-gluon amplitudes up to order g6g^6 through a polygon-organized inclusion-exclusion framework.

M. Maniatis2026-06-03✓ Author reviewed ⚛️ hep-th