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.

⚛️ phenomenology

Universal Mechanism of Dynamical Memory in Light-Nuclei Formation and Cosmological Bose-Einstein Condensation

This paper identifies a universal reduced-dynamical framework where eliminating intermediate sectors in both light-nuclei formation and cosmological Bose-Einstein condensation generates non-Markovian memory kernels, enabling predictions that the sequential-to-direct hypertriton formation ratio is sensitive to the hadronic stage's expansion history.

Takeshi Fukuyama2026-10-07
⚛️ phenomenology

Stochastic Bubble Completion in de Sitter Space: Power Spectrum, Bispectrum, and Infrared Moment Hierarchies

This paper investigates the stochastic completion time of first-order phase transitions in de Sitter space, demonstrating how rare ancient bubbles create an infrared-sensitive hierarchy in the power spectrum and bispectrum that is regulated by finite starting times or temporal localization, ultimately establishing a general framework for understanding curvature perturbations and non-Gaussianity.

Hyukjung Kim, Alp Kagan Ozmen, Heeseung Zoe2026-10-07
⚛️ general relativity

Universal Relations Meet Causality: Bounding the Dynamical Love Number of Neutron Stars

This paper demonstrates that fundamental physical principles like causality and passivity impose a tight upper bound on the dynamical tidal deformability of neutron stars, which is found to be nearly saturated by current theoretical models, thereby confirming the dominance of f-modes and offering a new equation-of-state-independent method to constrain dynamical tides.

Alex Kehagias, Antonio Riotto2026-10-07
⚛️ high-energy theory

QCD_2: 't Hooft equation vs. relativistic Schroedinger equation

This paper compares the meson mass spectrum of 2D QCD in the 't Hooft limit derived from the Bethe-Salpeter equation against that obtained from a relativistic Schrödinger equation, finding that while both methods agree in the leading semiclassical approximation, they yield different preasymptotic WKB corrections that are significant for the ground state but converge rapidly for higher excited states.

Andrei Smilga2026-10-07
⚛️ general relativity

Regular black holes do not violate the first law of thermodynamics

This paper demonstrates that regular black holes in general relativity coupled to nonlinear electrodynamics strictly obey the standard first law of thermodynamics, proving that the previously reported thermodynamic mismatch arises from an incorrect differentiation of mass along a subfamily of metrics that inadvertently varies the theory's couplings and conserved charges rather than representing a valid thermodynamic state change.

Bobir Toshmatov, Bobomurat Ahmedov, Nozima Isamadinova, Chengxun Yuan2026-10-07
⚛️ high-energy theory

Relative-Entropy Flow Across the Page Transition

This paper develops a computational framework using the replica trick to demonstrate that the Page transition in Jackiw-Teitelboim black hole evaporation can be understood as a flow of relative entropy costs, where the thermodynamic accuracy of the replica wormhole description overtakes the Hawking saddle precisely at the Page time, thereby providing an information-theoretic diagnosis for the emergence of effective irreversibility in coarse-grained semiclassical descriptions.

Minghui Yu, Xian-Hui Ge2026-10-07