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.

Lattice determination of the QCD low-energy constant 7\ell_{\scriptscriptstyle{7}}

This paper presents a non-perturbative lattice QCD determination of the scheme- and scale-independent low-energy constant 7\ell_7 using Nf=2+1N_f=2+1 staggered fermion simulations, yielding a final result of 2.79(61)×1032.79(61) \times 10^{-3} that significantly improves upon previous estimates.

Claudio Bonanno, Gilberto Colangelo, Francesco D'Angelo, Massimo D'Elia, Roberto Dionisio, Roberto Frezzotti, Giuseppe Gagliardi, Vittorio Lubicz, Guido Martinelli, Francesco Sanfilippo, Silvano Simul (…)2026-03-26⚛️ hep-lat

Acceleration Radiation of Freely Falling Atoms: Nonlinear Electrodynamic Effects

This paper investigates horizon-brightened acceleration radiation for freely falling two-level atoms in a Bardeen regular black hole geometry, demonstrating that the excitation spectrum remains Planckian with a temperature set by the Bardeen Hawking temperature while showing that the radiation is strongly suppressed as the black hole approaches an extremal, cold remnant limit.

Ali Övgün, Reggie C. Pantig, Bobomurat Ahmedov, Uktamjon Uktamov2026-03-26⚛️ gr-qc

Interpolating conformal algebra in (1+1)(1+1) dimensions between the instant form and the light-front form of relativistic dynamics

This paper presents an interpolating conformal algebra and its matrix representations in (1+1)(1+1) dimensions that bridge instant and light-front dynamics, demonstrating how the latter maximizes kinematic generators to significantly reduce the dynamical complexity of solving quantum field theories.

Chueng-Ryong Ji, Hariprashad Ravikumar2026-03-26⚛️ hep-th

Cosmology with Logarithmic Corrected Horizon Entropy According to the Generalized Entropy and Variable-G Correspondence

This paper applies the Generalized Entropy Varying-G (GEVAG) framework to investigate early-time cosmology with logarithmic entropy corrections, demonstrating that a positive correction coefficient naturally facilitates slow-roll inflation and ameliorates the "arrow of time" problem while avoiding sudden singularities that plague constant-GG models.

Chen-Hao Wu, Yen Chin Ong2026-03-26⚛️ gr-qc

Energy conditions of bouncing solutions in quadratic curvature gravity coupled with a scalar field

This paper analyzes energy conditions in nonsingular bouncing cosmologies within quadratic curvature gravity coupled to a scalar field, revealing that while the scalar-field description satisfies most conditions except the strong one, the effective energy-momentum tensor approach violates all four conditions near the bounce, thereby highlighting the intrinsically non-Einsteinian nature required to avoid initial singularities.

Yuki Hashimoto, Kazuharu Bamba, Sanjay Mandal2026-03-26⚛️ gr-qc

A Breath of Fresh Air for Molière: Detecting Molière Scattering using Jet Substructure Observables in Oxygen Collisions

This paper proposes that jet substructure observables, specifically the Soft Drop splitting angle and energy-energy correlators, in ultra-relativistic oxygen-oxygen collisions can uniquely detect rare, large-angle Molière scatterings between jet partons and quark-gluon plasma quasiparticles, offering a model-independent method to probe the medium's short-distance structure.

Arjun Srinivasan Kudinoor, Arthur Yi-Ting Lin, Daniel Pablos, Krishna Rajagopal2026-03-26⚛️ hep-ph