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Mathematics Preprint PDF DOI

Intermediate curvature and splitting theorem

Jingche Chen, Han Hong · 2026

In this paper, we prove several rigidity results for complete noncompact manifolds with nonnegative intermediate curvatures. We show that when either $3\leq n\leq 5$, $1\leq m\leq n-1$, or $6\leq n\le…

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Mathematics Preprint PDF DOI

MacNeille completions of parabolic quotients

Yibo Gao, Hanlin Xu · 2026

Alternating sign matrices (ASMs) arise as the Dedekind-MacNeille completion of the Bruhat order on the symmetric group. They enjoy fruitful combinatorial and geometric properties, with a particularly …

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Mathematics Preprint PDF DOI

Unitary representations and von Neumann's continuous geometries

Friedrich Martin Schneider, Andreas Thom · 2026

We prove that the unit group of a non-discrete irreducible, continuous ring, in the sense of John von Neumann, does not admit any non-trivial unitary representation continuous with respect to the stro…

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Physics Preprint PDF DOI

Accelerating finite-element-based projector augmented-wave density functional theory calculations with scalable GPU-centric computational methods

Kartick Ramakrishnan, Phani Motamarri · 2026

Accurate large-scale Kohn-Sham density functional theory (DFT) calculations are essential for modeling complex material systems, including interfaces, defects, nanoclusters, and twisted two-dimensiona…

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Mathematics Preprint PDF DOI

Symmetric Limit Cycles in 3D Piecewise Linear Systems with Visible-visible Two-Fold Singularity

Samuel Carlos S. Ferreira, Bruno R. Freitas, Joao Carlos R. Medrado · 2026

We analyze a three-dimensional discontinuous piecewise linear system \(Z=(X,Y)\) whose switching manifold \(\Sigma\) contains visible-visible two-fold intersection lines. Assuming that the matrices \(…

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Physics Preprint PDF DOI

Substitutional platinum as an efficient nonradiative recombination center in silicon

Zhenxing Dai, Menglin Huang, Xin-Gao Gong, Shiyou Chen · 2026

Platinum (Pt) is widely used for carrier-lifetime control in silicon power devices, yet the microscopic nonradiative recombination mechanism of the substitutional platinum ($\text{Pt}_\text{Si}$) dopa…

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Mathematics Preprint PDF DOI

Partition division maps, symmetric functions and positivity

Per Alexandersson, Lilan Dai · 2026

We introduce a linear map on symmetric functions that 'divides' a partition by a positive integer $k$, sending a Schur function indexed by a partition of $kn$ to a symmetric function indexed by partit…

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AI & Data Science Preprint PDF DOI

Self-DACE++: Robust Low-Light Enhancement via Efficient Adaptive Curve Estimation

Jianyu Wen, Jun Xie, Feng Chen, Zhepeng Wang, Chenhao Wu, Tong Zhang, Yixuan Yu, Piotr Swierczynski · 2026

In this paper, we present Self-DACE++, an improved unsupervised and lightweight framework for Low-Light Image Enhancement (LLIE), building upon our previous Self-Reference Deep Adaptive Curve Estimati…

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Physics Preprint PDF DOI

Kohn-Sham Hamiltonian from Effective Field Theory: Quasiparticle Band Narrowing from Frozen Core Dynamics

Xiansheng Cai, Han Wang, Kun Chen · 2026

Kohn-Sham (KS) eigenvalues are routinely compared with angle-resolved photoemission (ARPES) and used as input for many-body methods, yet density functional theory (DFT) assigns them no physical meanin…

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Physics Preprint PDF DOI

Identifying strong correlation using only the Kohn-Sham density of one-electron states

Daniel D. Rivera, Gustavo M. Dalpian, John P. Perdew · 2026

Strongly correlated systems have long been a central and highly non-trivial topic in condensed matter physics. At the non-interacting level, strong correlation can be associated with powerful (near) d…

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Chemistry Preprint PDF DOI

Enhancing molecular dynamics with equivariant machine-learned densities

Mihail Bogojeski, Muhammad R. Hasyim, Leslie Vogt-Maranto, Klaus-Robert Muller, Kieron Burke, Mark E. Tuckerman · 2026

Machine-learning interatomic potentials (MLIPs) have enabled molecular dynamics at near ab initio accuracy, yet remain limited to energies and forces by construction, leaving electronic observables su…

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Economics & Finance Preprint PDF DOI

The Anatomy of a Decentralized Prediction Market: Microstructure Evidence from the Polymarket Order Book

Philipp D. Dubach · 2026

We study the microstructure of Polymarket, the largest on-chain prediction market, using a continuous tick-level archive of the public WebSocket order-book feed (30 billion events over 52 days) joined…

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Mathematics Preprint PDF DOI

On optimization on ravine functions. Minkowski-Cohn moduli surface in Cohn parameterization

Nikolaj M. Glazunov · 2026

This paper presents a brief overview of ravine functions using the example of the Minkowski-Cohn moduli surface from the point of view of optimization on it. Elements of representation and solution of…

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Physics Preprint PDF DOI

Modeling the Zero-Phonon Line of Strained SnV Centers in Diamond; Including Reflections on Computational Cost and Accuracy

Danny E. P. Vanpoucke · 2026

Among the group-IV vacancy color centers in diamond, the SnV holds promise for photonics based quantum applications. In this work, the Tin-Vacancy (SnV) zero-phonon line (ZPL) and its pressure coeffic…

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Mathematics Preprint PDF DOI

A Milestone in Formalization: The Sphere Packing Problem in Dimension 8

Sidharth Hariharan, Christopher Birkbeck, Seewoo Lee, Ho Kiu Gareth Ma, Bhavik Mehta, Auguste Poiroux, Maryna Viazovska · 2026

In 2016, Viazovska famously solved the sphere packing problem in dimension $8$, using modular forms to construct a 'magic' function satisfying optimality conditions determined by Cohn and Elkies in 20…

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Mathematics Preprint PDF DOI

Eigenvalues of Hypergraph Products and Reciprocal Eigenvalue Property

Shashwath S Shetty, K Arathi Bhat · 2026

Spectral hypergraph theory has recently attracted considerable interest as it provides a natural framework for modeling higher-order relationships beyond classical graphs. In this setting, eigenvalues…

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Physics Preprint PDF DOI

Classifying magnons in itinerant ferromagnets from linear response TDDFT: Fe, Ni and Co revisited

Thorbj{o}rn Skovhus, Thomas Olsen · 2026

The magnetic excitation spectrum of itinerant magnets exhibits rich and complex spectral features that often complicate interpretation of the underlying physics. For perturbations in the long waveleng…

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Computer Science Preprint PDF DOI

How Hard is it to Decide if a Fact is Relevant to a Query?

Meghyn Bienvenu, Diego Figueira, Pierre Lafourcade · 2026

We consider the following fundamental problem: given a database D, Boolean conjunctive query (CQ) q, and fact f in D, decide whether f is relevant to q wrt. D, i.e., does f belong to a minimal subset …

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Physics Preprint PDF DOI

Amorphous Nanoconfinement Enables Self-sustaining Sabatier Reaction at Ambient Conditions

Zhiyong Qiu, Cheng Li, Jinzhen Yang, Fangkun Sun, Zheng Zhang, Canwen Yu, Weizheng Cai, Liang Guo, Yutong Gong, Junjie Wang, Meng Danny Gu, Jiazhen Wu · 2026

The Sabatier reaction, the catalytic hydrogenation of CO2 into CH4, offers a cornerstone for carbon capture and utilization, and in-situ resource utilization during space exploration; however, it face…

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Engineering Preprint PDF DOI

Effects of Swarm Size Variability on Operator Workload

William Hunt, Aleksandra Landowska, Horia A. Maior, Sarvapali D. Ramchurn, Mohammad Soorati · 2026

Real-world deployments of human--swarm teams depend on balancing operator workload to leverage human strengths without inducing overload. A key challenge is that swarm size is often dynamic: robots ma…

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