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arXiv preprints from January 1, 2026 through July 21, 2026 — 10:58:29 EST

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Posted in physics.ins-det · 2026-01-19 · Seung-Kyun Lee

Radio-frequency pulse design in local rotating frame in magnetic resonance imaging

The problem of spatially selective radio-frequency (RF) pulse design in magnetic resonance imaging (MRI) is typically stated in the form of determining, analytically or numerically, RF waveforms to be applied in synchrony with one or more predetermined gradient waveforms. In most cases, the dynamics of the nuclear spin magnetization...

💬 0 commentsarXiv:2601.12645v3PDF
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Posted in math.CO · 2026-01-19 · Pedro Fernando Fernández Espinosa, Maritza Liliana Arciniegas Torres, Camilo Andrés Acevedo Cadena

On Some Properties of Matrices with Entries Defined by Products of $k$-Fibonacci and $k$-Lucas Numbers

In this paper, we study a structured family of matrices whose entries are given by products of $k$-Fibonacci and $k$-Lucas numbers. For this family, we obtain explicit and unified formulas for several classical matrix invariants, including the determinant, inverse, trace, and matrix powers, revealing nontrivial algebraic patterns...

💬 0 commentsarXiv:2601.12644v2PDF
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Posted in math.NT · 2026-01-19 · Boris M. Bekker, Yuri G. Zarhin

Torsion points of small order on cyclic covers of $\mathbb{P}^1$. III

Let $d>1$ be an integer and $K_0$ a perfect field such that $char(K_0)$ does not divide $d$. Let $n>d$ be an integer that is prime to $d$. Let $f(x)\in K_0[x]$ be a degree $n$ monic polynomial without repeated roots, and $\mathcal{C}_{f,d}$ a smooth projective model of the affine curve $y^d=f(x)$. Let $J(\mathcal{C}_{f,d})$ be the...

💬 0 commentsarXiv:2601.12643v1PDF
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Posted in physics.flu-dyn · 2026-01-19 · Anahita Mobaseri, Leonardo Gordillo, Charles Burton, Soyoon Yoon, Dong Lee, Satish Kumar, Michelle M. Driscoll, Xiang Cheng

Inertia-Dilatancy Interplay Governs Shear-Thickening Drop Impact

Combining high-speed photography with direct force measurements, we investigate the impact dynamics of drops of cornstarch-water mixtures -- a premier example of shear-thickening fluids -- across a wide range of impact conditions. Our study identifies three distinct impact regimes. In addition to the liquid-like and solid-like...

💬 0 commentsarXiv:2601.12642v1PDF
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Posted in cs.AI · 2026-01-19 · Xiangyu Shi, Junyang Ding, Xu Zhao, Sinong Zhan, Payal Mohapatra, Daniel Quispe, Kojo Welbeck, Jian Cao, Wei Chen, Ping Guo, Qi Zhu

STEP-LLM: Generating CAD STEP Models from Natural Language with Large Language Models

Computer-aided design (CAD) is vital to modern manufacturing, yet model creation remains labor-intensive and expertise-heavy. To enable non-experts to translate intuitive design intent into manufacturable artifacts, recent large language models-based text-to-CAD efforts focus on command sequences or script-based formats like CadQuery....

💬 0 commentsarXiv:2601.12641v1PDF
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Posted in cs.IT · 2026-01-19 · Jingge Zhu, Matthias Frey

Beyond Identification: Computing Boolean Functions via Channels

Consider a point-to-point communication system in which the transmitter holds a binary message of length $m$ and transmits a corresponding codeword of length $n$. The receiver's goal is to recover a Boolean function of that message, where the function is unknown to the transmitter, but chosen from a known class $F$. We are interested...

💬 0 commentsarXiv:2601.12640v2PDF
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Posted in cs.CL · 2026-01-19 · Daniel Vennemeyer, Punya Syon Pandey, Phan Anh Duong, Michael Umeokoli, Samuel Ratnam

Objective Matters: Fine-Tuning Objectives Shape Safety, Robustness, and Persona Drift

Fine-tuning LLMs on benign data can still degrade alignment and adversarial robustness, yet direct analysis of the role of fine-tuning objectives in shaping these safety outcomes remain limited. We present a controlled comparison of six fine-tuning objectives -- Supervised Fine-Tuning, Direct Preference Optimization, Conditional...

💬 0 commentsarXiv:2601.12639v1PDF
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Posted in cs.CV · 2026-01-19 · Ninnart Fuengfusin, Keisuke Yoneda, Naoki Suganuma

Mixed Precision PointPillars for Efficient 3D Object Detection with TensorRT

LIDAR 3D object detection is one of the important tasks for autonomous vehicles. Ensuring that this task operates in real-time is crucial. Toward this, model quantization can be used to accelerate the runtime. However, directly applying model quantization often leads to performance degradation due to LIDAR's wide numerical...

💬 0 commentsarXiv:2601.12638v2PDF
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Posted in cs.LG · 2026-01-19 · Long D. Nguyen, Kelin Xia, Binh P. Nguyen

Topology-Aware Multiscale Mixture of Experts for Efficient Molecular Property Prediction

Many molecular properties depend on 3D geometry, where non-covalent interactions, stereochemical effects, and medium- to long-range forces are determined by spatial distances and angles that cannot be uniquely captured by a 2D bond graph. Yet most 3D molecular graph neural networks still rely on globally fixed neighborhood heuristics,...

💬 0 commentsarXiv:2601.12637v1PDF
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Posted in cs.CV · 2026-01-19 · Satyaki Roy Chowdhury, Aswathnarayan Radhakrishnan, Hsiao Jou Hsu, Hari Subramoni, Joachim Moortgat

From Bands to Depth: Understanding Bathymetry Decisions on Sentinel-2

Deploying Sentinel-2 satellite derived bathymetry (SDB) robustly across sites remains challenging. We analyze a Swin-Transformer based U-Net model (Swin-BathyUNet) to understand how it infers depth and when its predictions are trustworthy. A leave-one-band out study ranks spectral importance to the different bands consistent with...

💬 0 commentsarXiv:2601.12636v1PDF
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Posted in quant-ph · 2026-01-19 · Aleyna Ceyran, Jair Minoro Abe

Equation-Free Discovery of Open Quantum Systems via Paraconsistent Neural Networks

Modeling the dynamics of open quantum systems on noisy intermediate-scale quantum (NISQ) devices constitutes a major challenge, as high noise levels and environmental degradations lead to the decay of pure quantum states (decoherence) and energy losses. This situation represents one of the most important problems in the field of...

💬 0 commentsarXiv:2601.12635v2PDF
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Posted in cs.CR · 2026-01-19 · Olawale Amos Akanji, Manuel Egele, Gianluca Stringhini

The Cost of Convenience: Identifying, Analyzing, and Mitigating Predatory Loan Applications on Android

Digital lending applications, commonly referred to as loan apps, have become a primary channel for microcredit in emerging markets. However, many of these apps demand excessive permissions and misuse sensitive user data for coercive debt-recovery practices, including harassment, blackmail, and public shaming that affect both borrowers...

💬 0 commentsarXiv:2601.12634v1PDF
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Posted in cs.LG · 2026-01-19 · Ishir Garg, Neel Kolhe, Andy Peng, Rohan Gopalam

Fisher-Orthogonal Projected Natural Gradient Descent for Continual Learning

Continual learning aims to enable neural networks to acquire new knowledge on sequential tasks. However, the key challenge in such settings is to learn new tasks without catastrophically forgetting previously learned tasks. We propose the Fisher-Orthogonal Projected Natural Gradient Descent (FOPNG) optimizer, which enforces...

💬 0 commentsarXiv:2601.12816v2PDF
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Posted in cs.CL · 2026-01-19 · Zhaolu Kang, Junhao Gong, Qingxi Chen, Hao Zhang, Jiaxin Liu, Rong Fu, Zhiyuan Feng, Yuan Wang, Simon Fong, Kaiyue Zhou

Multimodal Multi-Agent Empowered Legal Judgment Prediction

Legal Judgment Prediction (LJP) aims to predict the outcomes of legal cases based on factual descriptions, serving as a fundamental task to advance the development of legal systems. Traditional methods often rely on statistical analyses or role-based simulations but face challenges with multiple allegations, diverse evidence, and lack...

💬 0 commentsarXiv:2601.12815v5PDF
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Posted in cs.CV · 2026-01-19 · Yu-Jen Tseng, Chia-Hao Kao, Jing-Zhong Chen, Alessandro Gnutti, Shao-Yuan Lo, Yen-Yu Lin, Wen-Hsiao Peng

CSGaussian: Progressive Rate-Distortion Compression and Segmentation for 3D Gaussian Splatting

We present the first unified framework for rate-distortion-optimized compression and segmentation of 3D Gaussian Splatting (3DGS). While 3DGS has proven effective for both real-time rendering and semantic scene understanding, prior works have largely treated these tasks independently, leaving their joint consideration unexplored....

💬 0 commentsarXiv:2601.12814v1PDF
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Posted in cs.PL · 2026-01-19 · Keyin Wang, Xiaomu Shi, Jiaxiang Liu, Zhilin Wu, Taolve Chen, Fu Song, David N. Jansen

A Formally Verified Procedure for Width Inference in FIRRTL

FIRRTL is an intermediate representation language for Register Transfer Level (RTL) hardware designs. In FIRRTL programs, the bit widths of many components are not specified explicitly and must be inferred during compilation. In mainstream FIRRTL compilers, such as the official compiler firtool, width inference is conducted by a...

💬 0 commentsarXiv:2601.12813v1PDF
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Posted in cs.CL · 2026-01-19 · Sushant Kumar Ray, Gautam Siddharth Kashyap, Sahil Tripathi, Nipun Joshi, Vijay Govindarajan, Rafiq Ali, Jiechao Gao, Usman Naseem

Do Clinical Question Answering Systems Really Need Specialised Medical Fine Tuning?

Clinical Question-Answering (CQA) industry systems are increasingly rely on Large Language Models (LLMs), yet their deployment is often guided by the assumption that domain-specific fine-tuning is essential. Although specialised medical LLMs such as BioBERT, BioGPT, and PubMedBERT remain popular, they face practical limitations...

💬 0 commentsarXiv:2601.12812v1PDF
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Posted in cs.SE · 2026-01-19 · Julien Malka, Stefano Zacchiroli, Théo Zimmermann

Docker Does Not Guarantee Reproducibility

The reproducibility of software environments is a critical concern in modern software engineering, with ramifications ranging from the effectiveness of collaboration workflows to software supply chain security and scientific reproducibility. Containerization technologies like Docker address this problem by encapsulating software...

💬 0 commentsarXiv:2601.12811v1PDF
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Posted in math.OC · 2026-01-19 · Hoai-Minh Nguyen

Optimal bounds for the boundary control cost of one-dimensional fractional Schrödinger and heat equations

We derive sharp bounds for the boundary control cost of the one-dimensional fractional Schrödinger and heat equations. The analysis of the lower bound is based on the study of the control cost of a related singular boundary control problem in finite time, using tools from complex analysis. The analysis of the upper bound relies on the...

💬 0 commentsarXiv:2601.12810v1PDF
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Posted in cs.CV · 2026-01-19 · Takaki Yamamoto, Chihiro Noguchi, Toshihiro Tanizawa

Left-Right Symmetry Breaking in CLIP-style Vision-Language Models Trained on Synthetic Spatial-Relation Data

Spatial understanding remains a key challenge in vision-language models. Yet it is still unclear whether such understanding is truly acquired, and if so, through what mechanisms. We present a controllable 1D image-text testbed to probe how left-right relational understanding emerges in Transformer-based vision and text encoders...

💬 0 commentsarXiv:2601.12809v2PDF
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Posted in cs.IT · 2026-01-19 · Tong Wu, Zhiyong Chen, Guo Lu, Li Song, Feng Yang, Meixia Tao, Wenjun Zhang

Joint Source-Channel-Generation Coding: From Distortion-oriented Reconstruction to Semantic-consistent Generation

Conventional communication systems, including both separation-based coding and AI-driven joint source-channel coding (JSCC), are largely guided by Shannon's rate-distortion theory. However, relying on generic distortion metrics fails to capture complex human visual perception, often resulting in blurred or unrealistic reconstructions....

💬 0 commentsarXiv:2601.12808v1PDF
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Posted in cs.LG · 2026-01-19 · Zixing Song, Irwin King

Semi-supervised Instruction Tuning for Large Language Models on Text-Attributed Graphs

The emergent reasoning capabilities of Large Language Models (LLMs) offer a transformative paradigm for analyzing text-attributed graphs. While instruction tuning is the prevailing method for adapting pre-trained LLMs to graph learning tasks like node classification, it requires a substantial volume of annotated (INSTRUCTION, OUTPUT)...

💬 0 commentsarXiv:2601.12807v1PDF
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Posted in hep-ph · 2026-01-19 · Chih-Ting Lu, Kingman Cheung, Dongjoo Kim, Soojin Lee, Jeonghyeon Song

Can a pseudoscalar with a mass of 365 GeV in the 2HDM explain the CMS $t\bar{t}$ excess?

We analyze the CMS-reported t tbar excess within conventional Two-Higgs-Doublet Models of Types I, II, X, and Y, using the best-fit pseudoscalar parameters MA = 365 GeV, GammaA over MA = 2 percent, and tan beta = 1.28. Applying theoretical and experimental constraints, including stability, unitarity, perturbativity, flavor...

💬 0 commentsarXiv:2601.12806v1PDF
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Posted in cs.CR · 2026-01-19 · Nay Myat Min, Long H. Pham, Hongyu Zhang, Jun Sun

CORVUS: Red-Teaming Hallucination Detectors via Internal Signal Camouflage in Large Language Models

Single-pass hallucination detectors rely on internal telemetry (e.g., uncertainty, hidden-state geometry, and attention) of large language models, implicitly assuming hallucinations leave separable traces in these signals. We study a white-box, model-side adversary that fine-tunes lightweight LoRA adapters on the model while keeping...

💬 0 commentsarXiv:2601.14310v1PDF