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.

A Light-Cone Approach to Higher-Order Cosmological Observables

This paper develops a second-order cosmological perturbation theory on a light-cone background, establishing a gauge-invariant framework that connects to the Observational Synchronous Gauge and successfully computes the luminosity distance-redshift relation up to second order while eliminating observer-position divergences in a model-independent manner.

Pierre Béchaz, Giuseppe Fanizza, Giovanni Marozzi, Matheus R. Medeiros Silva2026-03-27⚛️ gr-qc

Topological 5d N=2\mathcal{N} = 2 Gauge Theories: Mirror Symmetry and Langlands Duality of AA_\infty-categories of Floer Homologies

This paper establishes a physical proof of mirror symmetry and Langlands duality between specific topological 5d N=2\mathcal{N}=2 gauge theories, demonstrating that the AA_\infty-categories of Floer homologies arising from Haydys-Witten and Geyer-Mülsch twists on certain five-manifolds are dual to each other and provide gauge-theoretic generalizations of mathematical conjectures by Bousseau and Doan-Rezchikov.

Arif Er, Meng-Chwan Tan2026-03-27⚛️ hep-th

Shockwaves and Time Delays in Einstein-Maxwell Effective Field Theory

This paper derives the shockwave metric in four-dimensional Einstein-Maxwell effective field theory by boosting a charged black hole with leading-order corrections, demonstrating that unlike the neutral case, electrically charged shockwaves receive nontrivial EFT modifications and that a physically consistent, field-redefinition-invariant time delay for a probe photon requires accounting for both the corrected shockwave geometry and the probe's backreaction.

Christophe Grojean, Minyuan Jiang, Pham Ngoc Hoa Vuong2026-03-27⚛️ hep-th

Exploring the twisted sector of ZL\mathbb{Z}_{L} orbifolds: Matching α\alpha'-corrections to localisation

This paper resolves a mismatch between localization results in N=2\mathcal{N}=2 circular quiver gauge theories and naive supergravity reductions of α\alpha'-corrections in ZL\mathbb{Z}_L orbifolds by demonstrating that twisted sector resonances must be included in the low-energy expansion of string amplitudes, revealing that orbifold resolution and low-energy limits cannot be directly interchanged.

Carlos Barredo Martínez, Torben Skrzypek2026-03-27⚛️ hep-th

Inflationary Dynamics and Perturbations in Fractal Cosmology

This paper investigates inflationary dynamics and scalar perturbations within a fractal cosmology framework characterized by a non-integer effective dimension, deriving generalized slow-roll parameters and a modified Mukhanov-Sasaki equation to show that comparison with Planck 2018 data constrains the fractal dimension to the range 2.7D32.7 \lesssim D \lesssim 3.

Aarav Shah, Paulo Moniz, Maxim Khlopov, Oem Trivedi, Maxim Krasnov2026-03-27⚛️ gr-qc