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Physics Preprint PDF DOI

MG-NECOLA: A Field-Level Emulator for $f(R)$ Gravity and Massive Neutrino Cosmologies

J. Bayron Orjuela-Quintana, Mauricio Reyes, Elena Giusarma, Marco Baldi, Neerav Kaushal, Cesar A. Valenzuela-Toledo · 2026

Accurate modeling of non-linear gravitational dynamics is essential for constraining extensions to the standard cosmological model using large-scale structure observations. While high-resolution $N$-b…

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Mathematics Preprint PDF DOI

Whitehead torsion and the kernel of assembly

Oscar Harr · 2026

For a topological space that is homeomorphic to a finite simplicial complex, we prove that the Bartels--Nikolaus assembly functor has a fully faithful right adjoint. Using this, we define for each suc…

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Mathematics Preprint PDF DOI

Statistical Limit Theorems for Axiom A Diffeomorphisms: Exponential Mixing, Central Limit Theorem, and Large Deviations

Abdoulaye Thiam · 2026

We establish statistical limit theorems for equilibrium states of Axiom A diffeomorphisms, derived from the spectral gap of the Ruelle transfer operator established in Part I (Thiam2026a) and transfer…

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Physics Preprint PDF DOI

Multi-Fidelity Monte-Carlo Estimation of Satellite Drag in Very-Low-Earth Orbit

Jovan Boskovic, Marcel Pfeifer, Andrea Beck · 2026

Very-low-Earth orbit drag uncertainty quantification in the rarefied/transitional Knudsen-number regime requires estimating not only the mean drag coefficient but also higher-order moments under atmos…

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Mathematics Preprint PDF DOI

Normal approximation for iterated inner functions

Yukun Chen, Xiangdi Fu, Zhaofeng Lin, Yanqi Qiu · 2026

A Berry--Ess\'{e}en theorem for linear combinations of iterates of an inner function is obtained. Our proof, which is based an elementary transfer argument and classical results in martingale theory, …

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AI & Data Science Preprint PDF DOI

Why MLLMs Struggle to Determine Object Orientations

Anju Gopinath, Nikhil Krishnaswamy, Bruce Draper · 2026

Multimodal Large Language Models (MLLMs) struggle with tasks that require reasoning about 2D object orientation in images, as documented in prior work. Tong et al. and Nichols et al. hypothesize that …

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Mathematics Preprint PDF DOI

On Petr Novikov's problem of ordered systems of uniform sets

Vladimir Kanovei, Vassily Lyubetsky · 2026

We prove that every ordinal $\alpha<\omega_2$ is the order type of a certain system of uniform Borel sets in the sense of a well-ordering relation defined by Petr Novikov. This result gives a positive…

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Mathematics Preprint PDF DOI

Strong Convergence of FISTA for Affinely Constrained Convex Quadratic Minimization

Sedi Bartz, Heinz H. Bauschke, Yuan Gao, Walaa M. Moursi · 2026

In October 2025, research by Bo\c{t}, Fadili, and Nguyen, and by Jang and Ryu, led to the seminal result that Beck and Teboulle's FISTA converges weakly to a minimizer of the sum of two convex functio…

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Physics Preprint PDF DOI

A Shakhov-based Bhatnagar-Gross-Krook model for polyatomic molecules and for atomic as well as polyatomic mixtures

Marcel Pfeiffer, Franziska Tuttas · 2026

The implementation of the Shakhov Bhatnagar-Gross-Krook (SBGK) method in the open-source particle code PICLas is extended for modeling of polyatomic molecules, as well as mixtures including atoms and …

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Physics Preprint PDF DOI

A P-Adaptive Hybridizable Discontinuous Galerkin Spectral Element Method for Electrostatic Particle-in-Cell Simulations

Tobias Ott, Stephen Copplestone, Marcel Pfeiffer · 2026

This paper presents a p-adaptive high-order hybridizable discontinuous Galerkin spectral element method (HDG-SEM) for solving the Poisson equation in electrostatic plasma simulations using particle-in…

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Mathematics Preprint PDF DOI

Locating isolas in nonlinear oscillator systems using uncertainty quantification

Dongxiao Hong, David A. W. Barton, Simon A. Neild · 2026

Parametric uncertainty in nonlinear dynamical systems can fundamentally alter bifurcation behaviour, leading to qualitative response changes. Predicting operating margins/envelopes under such uncertai…

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Mathematics Preprint PDF DOI

Simple Yetter-Drinfeld modules over Generalized Liu algebras

Xiangjun Zhen, Gongxiang Liu, Jing Yu · 2026

Let $H$ be a generalized Liu algebra over an algebraically closed field $k$ of characteristic zero. We prove that all simple Yetter-Drinfeld modules over $H$ are finite-dimensional and present an expl…

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Computer Science Preprint PDF DOI

From Morality Installation in LLMs to LLMs in Morality-as-a-System

Gunter Bombaerts · 2026

Work on morality in large language models (LLMs) has progressed via constitutional AI, reinforcement learning from human feedback (RLHF) and systematic benchmarking, yet it still lacks tools to connec…

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Mathematics Preprint PDF DOI

The de Rham and the syntomic logarithm

Matthias Flach, Achim Krause, Baptiste Morin · 2026

We define and study an integral refinement of the inverse of the Bloch-Kato exponential map which we call the de Rham logarithm. Our main tool to analyze the de Rham logarithm is the syntomic logarith…

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Mathematics Preprint PDF DOI

Stability of the generalized Wehrl entropy and the local concentration of homogeneous polynomials

Maria Angeles Garcia-Ferrero, Joaquim Ortega-Cerda · 2026

We study two notions of concentration for homogeneous polynomials of degree $N$ in $d+1$ complex variables on the unit sphere: a local notion measuring the fraction of the $L^2$-norm supported on a me…

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Mathematics Preprint PDF DOI

Sheets of Spectral Data of Stokes Waves in Weakly Nonlinear Models

Benjamin Akers, Ryan P. Creedon · 2026

We study the spectral stability of small-amplitude Stokes waves in a family of weakly nonlinear, unidirectional models of the form $u_t + L u + (u^2)_x = 0$. We introduce a perturbation method to expa…

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Engineering Preprint PDF DOI

LineMaster Pro: A Low-Cost Intelligent Line Following Robot with PID Control and Ultrasonic Obstacle Avoidance for Educational Robotics

Jeni Shahi, Abhishek Shah, A. S. M. Ahsanul Sarkar Akib · 2026

Line following robots are fundamental platforms in robotics education, yet commercially available solutions remain prohibitively expensive ($150-300$) while lacking integrated obstacle detection capab…

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Mathematics Preprint PDF DOI

Hopf algebras over Chevalley groups

Nicolas Andruskiewitsch, Giovanna Carnovale · 2026

We show that every finite-dimensional pointed Hopf algebra over a finite simple Chevalley group, different from $PSL_2(q)$ with q= 3 mod 4 (and from $PSL_3(2)\simeq PSL_2(7)$), is isomorphic to the co…

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Computer Science Preprint PDF DOI

On the Computational Content of Moduli of Regularity and their Logical Strength

Ulrich Kohlenbach (Department of Mathematics, Technische Universitaet Darmstadt) · 2026

We continue the investigation into the computational status of the existence of moduli of regularity (and their use for rates of convergence) in the sense of Kohlenbach, Lopez and Nicolae (2019), carr…

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Computer Science Preprint PDF DOI

Voices of the Mountains: Deep Learning-Based Vocal Error Detection System for Kurdish Maqams

Darvan Shvan Khairaldeen, Hossein Hassani · 2026

Maqam, a singing type, is a significant component of Kurdish music. A maqam singer receives training in a traditional face-to-face or through self-training. Automatic Singing Assessment (ASA) uses mac…

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