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.

Comment on Cosmological constraints on unimodular gravity models with diffusion (arXiv:2211.07424): thermodynamic inadmissibility of the H0 tension resolution mechanism

This paper demonstrates that diffusion-based Unimodular Gravity models proposed to resolve the H0H_0 tension are thermodynamically inadmissible because they violate the second law of thermodynamics by requiring a negative energy transfer rate (Q˙<0\dot{Q} < 0) that contradicts the necessary condition for alleviating the tension.

Mauricio Cataldo2026-04-21⚛️ gr-qc

Electromagnetic Wightman functions and vacuum densities for a brane intersecting the AdS boundary

This paper investigates the electromagnetic vacuum characteristics induced by a brane intersecting the AdS boundary under perfect electric and magnetic boundary conditions, deriving explicit expressions for Wightman functions and demonstrating that the resulting vacuum energy density and stress components exhibit distinct sign behaviors and non-vanishing properties unique to the AdS spacetime geometry.

A. A. Saharian, R. M. Avagyan, V. F. Manukyan2026-04-21⚛️ hep-th

Crystallography, Lorentz violation, and the Standard-Model Extension

This paper establishes a theoretical framework connecting the electromagnetic sector of the Standard-Model Extension (SME) for Lorentz violation with crystallography, demonstrating how crystal symmetries parametrize optical media properties and enabling the use of specific materials as condensed-matter analogs to rediscover and propose novel optical effects.

Marco Schreck, Rogeres A. da Silva Magalhães2026-04-21🔬 cond-mat.mes-hall

Holography and Optimal Transport: Emergent Wasserstein Spacetime in Harmonic Oscillator, SYK and Krylov Complexity

This paper proposes that holographic spacetime emerges as a Wasserstein space through optimal transport of quantum state distributions, demonstrating that the 1-Wasserstein distance between Husimi Q-representations serves as a generalized Krylov complexity to reproduce black hole geometries in harmonic oscillators and SYK models under the manifold hypothesis.

Koji Hashimoto, Norihiro Tanahashi2026-04-21⚛️ hep-th

Holographic Schwinger Effect In a Step Dilaton Background

This paper investigates the holographic Schwinger effect in a confining background with a step dilaton profile, demonstrating that the abrupt geometric transition significantly enhances the sensitivity of the critical electric field and vacuum decay compared to smooth soft-wall models, while also revealing a pronounced, orientation-dependent deformation of the potential barrier under external magnetic fields.

Sara Tahery, Qin Chang2026-04-21⚛️ hep-th