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.

⚛️ general relativity

Revisiting Critical Higgs Inflation: Electroweak Couplings, CMB Observables, and Perturbative Unitarity

This paper demonstrates that while critical Higgs inflation can individually satisfy electroweak constraints and reproduce CMB observables through appropriate parameter tuning, no region of its parameter space simultaneously fulfills all three physical criteria, implying that its predictions remain inherently sensitive to unknown ultraviolet physics.

Sarah R. Geller, Sol Gutierrez-Lara, David I. Kaiser, Thomas Steingasser2026-10-14
⚛️ general relativity

Quantum Energy Inequalities with a twist: rotating frames along stationary worldlines

This paper derives closed-form Quantum Energy Inequality bounds for massless scalar and electromagnetic fields along stationary worldlines in Minkowski spacetime by optimizing over tetrads with constant angular velocity, revealing that while Fermi-Walker tetrads yield the tightest bounds for the electromagnetic field, they do not necessarily do so for scalar fields, thereby significantly improving upon previous results that were limited to Frenet-Serret tetrads.

Christopher J. Fewster, Daniel Lomax Ford2026-10-14
⚛️ general relativity

Ultralight scalars and invisible gravitons

This paper argues that the viability of ultralight scalars and invisible gravitons depends critically on the post-inflationary expansion timeline, specifically requiring that the decelerated phase be slower than radiation to avoid conflicts with large-scale observations while simultaneously constraining the duration of such stages and the mass range of the scalars through Big Bang nucleosynthesis and high-frequency graviton spectra.

Massimo Giovannini2026-10-14
⚛️ high-energy experiments

Modular S4S_4 Inverse Seesaw at the LZ High-Recoil Frontier

This paper proposes a modular S4S_4 inverse seesaw model that unifies lepton flavor physics with high-recoil inelastic dark matter, demonstrating that a common complex modulus can simultaneously satisfy neutrino oscillation data and predict a TeV-scale pseudo-Dirac fermion with a ∼371.5\sim371.5 keV mass splitting that aligns with extended LUX-ZEPLIN nuclear-recoil analyses.

Waqas Ahmed, Vasileios Basiouris, George K. Leontaris2026-10-14
⚛️ high-energy experiments

Characteristic Modes of Non-minimally Coupled Thick Branes

This paper investigates the characteristic modes of non-minimally coupled thick branes with single-kink and deformed scalar configurations, demonstrating that while the graviton zero mode is localized in both models, the deformed brane exhibits resonant Kaluza-Klein modes whose properties are closely correlated with the quasinormal modes calculated via independent frequency and time domain methods.

Jing-Xin Gong, Heng Guo, Yong-Tao Lu, Xin-Yi Pan2026-10-14