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.

⚛️ high-energy theory

Revival Dynamics from Equilibrium States: Scars from Chords in SYK

This paper develops a novel framework for constructing quantum many-body scar states in bipartite systems with perfectly correlated Hamiltonians, demonstrating that initializing such systems in a purification of a generic equilibrium state leads to universal finite-time revivals, a phenomenon analytically and numerically validated using the double-scaled SYK model.

Debarghya Chakraborty, Dario Rosa2026-04-03
⚛️ high-energy theory

Asymptotic freedom, lost: Complex conformal field theory in the two-dimensional O(N>2)O(N>2) nonlinear sigma model and its realization in Heisenberg spin chains

This paper demonstrates that the two-dimensional O(N>2)O(N>2) nonlinear sigma model possesses a generic complex conformal field theory fixed point in the complex coupling plane, which is numerically confirmed in non-Hermitian Heisenberg spin chains and can be realized through engineered dissipation to prepare long-range entangled states.

Christopher Yang, Thomas Scaffidi2026-04-03
⚛️ phenomenology

Laser-assisted production of the light charged Higgs boson from top quark decay in the type-I two Higgs doublet model

This paper investigates the impact of a circularly polarized laser field on top quark decay within the type-I two Higgs doublet model, demonstrating that specific laser parameters can significantly enhance the branching ratio of the t→bH+t \rightarrow bH^+ channel to 0.97, thereby surpassing the standard t→bW+t \rightarrow bW^+ decay and offering a promising strategy for detecting charged Higgs bosons.

M. Jakha, S. Mouslih, M. Ouhammou, R. Chahri, S. El Asri, S. Taj, B. Manaut2026-04-03
⚛️ phenomenology

Origin of the Covariant Wigner Operator as a Quantum Amplitude in QCD

This paper extends the Koopman-von Neumann-Sudarshan Hilbert space formulation to relativistic QCD, demonstrating that the covariant Wigner operator is fundamentally a quantum probability amplitude projected onto phase space, thereby offering a unified framework that clarifies the origin of nonclassical features like negativity and establishes a transparent foundation for parton distribution functions.

Chueng-Ryong Ji, Daniel W. Piasecki2026-04-03
⚛️ general relativity

Plummer Dark Matter Black Hole with Topological Defects: Shadow, Greybody Factors, Quasinormal Modes, and Thermodynamics

This paper presents a static, spherically symmetric black hole solution embedded in a Plummer dark matter halo and a Letelier cloud of strings, systematically analyzing its geometric properties, shadow, deflection angle, scalar perturbations, and thermodynamics to demonstrate that the string-cloud tension parameter α\alpha drives leading-order modifications to all observables while the dark matter halo density ρ0\rho_0 provides only subdominant corrections.

Ahmad Al-Badawi, Faizuddin Ahmed, İzzet Sakallı2026-04-03
⚛️ high-energy theory

Descending into the Modular Bootstrap

This paper employs machine-learning-style optimization, featuring a novel singular-value-based optimizer and uncertainty estimation, to numerically explore the landscape of two-dimensional conformal field theories with central charges between 1 and 8/7, identifying candidate spectra in a previously uncharted region and suggesting a tighter constraint on the spectral gap near c=1c=1.

Nathan Benjamin, A. Liam Fitzpatrick, Wei Li, Jesse Thaler2026-04-03
🤖 machine learning

Sven: Singular Value Descent as a Computationally Efficient Natural Gradient Method

The paper introduces Sven, a computationally efficient natural gradient optimization algorithm that utilizes a truncated singular value decomposition of the loss Jacobian to simultaneously satisfy individual data point residuals, offering faster convergence and lower final loss than standard first-order methods on regression tasks while scaling linearly with the number of retained singular directions rather than quadratically with the number of parameters.

Samuel Bright-Thonney, Thomas R. Harvey, Andre Lukas, Jesse Thaler2026-04-03