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arXiv preprints from January 1, 2026 through September 15, 2026 — 15:16:30 EST

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Posted in astro-ph.HE · 2026-01-20 · An-Chieh Hsu, Tetsuya Hashimoto, Tomotsugu Goto, Tomoki Wada, Bjorn Jasper Raquel

Unveiling Hidden Clustering: An Unsupervised Machine Learning Study of Repeating FRB 20220912A

Fast Radio Bursts (FRBs) are millisecond-duration radio transients of extragalactic origin. Classifying repeating FRBs is essential for understanding their emission mechanisms, but remains challenging due to their short durations, high variability, and increasing data volume. Traditional methods often rely on subjective criteria and...

💬 0 commentsarXiv:2601.14065v2PDF
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Posted in math.DG · 2026-01-20 · Xavier Gràcia, Xavier Rivas, Daniel Torres

Time-dependent metrics and connections

Time-dependent structures often appear in differential geometry, particularly in the study of non-autonomous differential equations on manifolds. One may study the geodesics associated with a time-dependent Riemannian metric by extremizing the corresponding energy functional, but also through the introduction of a more general concept...

💬 0 commentsarXiv:2601.14064v1PDF
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Posted in cs.CL · 2026-01-20 · Mohsinul Kabir, Tasnim Ahmed, Md Mezbaur Rahman, Shaoxiong Ji, Hassan Alhuzali, Yuechen Jiang, Jimin Huang, Sophia Ananiadou

XCR-Bench: Benchmarking Cross-Cultural Reasoning in LLMs via Culture-Specific Items and Hall's Triad

Cross-cultural competence in large language models (LLMs) requires understanding and adapting Culture-Specific Items (CSIs) across varying cultural contexts. However, progress in evaluating this capability remains limited by the lack of high-quality CSI-annotated corpora with parallel cross-cultural sentence pairs. We introduce...

💬 0 commentsarXiv:2601.14063v2PDF
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Posted in q-fin.ST · 2026-01-20 · Payel Sadhukhan, Samrat Gupta, Subhasis Ghosh, Tanujit Chakraborty

Demystifying the trend of the healthcare index: Is historical price a key driver?

Healthcare sector indices consolidate the economic health of pharmaceutical, biotechnology, and healthcare service firms. The short-term movements in these indices are closely intertwined with capital allocation decisions affecting research and development investment, drug availability, and long-term health outcomes. This research...

💬 0 commentsarXiv:2601.14062v1PDF
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Posted in math.DS · 2026-01-20 · Tom Rush

Frostman dimension of Furstenberg measure for $\mathrm{SL}(2,\mathbb{R})$ random matrix products

For compactly supported $μ\in \mathcal{P}(\mathrm{SL}(2,\mathbb{R}))$ satisfying strong irreducibility and proximality, we obtain a formula for the Frostman dimension of the associated Furstenberg measure. We also describe the left neighbourhood of 0 for which the classical transfer operators defined by Le Page have a spectral gap on...

💬 0 commentsarXiv:2601.14061v1PDF
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Posted in cs.CR · 2026-01-20 · William Pan, Guiran Liu, Binrong Zhu, Qun Wang, Yingzhou Lu, Beiyu Lin, Rose Qingyang Hu

Rethinking On-Device LLM Reasoning: Why Analogical Mapping Outperforms Abstract Thinking for IoT DDoS Detection

The rapid expansion of IoT deployments has intensified cybersecurity threats, notably Distributed Denial of Service (DDoS) attacks, characterized by increasingly sophisticated patterns. Leveraging Generative AI through On-Device Large Language Models (ODLLMs) provides a viable solution for real-time threat detection at the network...

💬 0 commentsarXiv:2601.14343v1PDF
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Posted in cs.LG · 2026-01-20 · Vincent Gurgul, Ying Chen, Stefan Lessmann

Variational Quantum Circuit-Based Reinforcement Learning for Dynamic Portfolio Optimization

This paper presents a Quantum Reinforcement Learning (QRL) solution to the dynamic portfolio optimization problem based on Variational Quantum Circuits. The implemented QRL approaches are quantum analogues of the classical neural-network-based Deep Deterministic Policy Gradient and Deep Q-Network algorithms. Through an empirical...

💬 0 commentsarXiv:2601.18811v2PDF
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Posted in cs.CV · 2026-01-20 · Yongcong Ye, Kai Zhang, Yanghai Zhang, Enhong Chen, Longfei Li, Jun Zhou

Fine-Grained Zero-Shot Composed Image Retrieval with Complementary Visual-Semantic Integration

Zero-shot composed image retrieval (ZS-CIR) is a rapidly growing area with significant practical applications, allowing users to retrieve a target image by providing a reference image and a relative caption describing the desired modifications. Existing ZS-CIR methods often struggle to capture fine-grained changes and integrate visual...

💬 0 commentsarXiv:2601.14060v1PDF
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Posted in cs.PL · 2026-01-20 · Andrea Gilot, Axel Bergström, Eva Darulova

Verifying Floating-Point Programs in Stainless

We extend the Stainless deductive verifier with floating-point support, providing the first automated verification support for floating-point numbers for a subset of Scala that includes polymorphism, recursion and higher-order functions. We follow the recent approach in the KeY verifier to axiomatise reasoning about mathematical...

💬 0 commentsarXiv:2601.14059v1PDF
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Posted in physics.optics · 2026-01-20 · Manuel Kohli, Jean Teissier

VCSEL-based CPO for Scale-Up in A.I. Datacenter. Status and Perspectives

The drastic increase of bandwidth demands in AI datacenters requires new solutions with low power consumption and high bandwidth densities. Further increasing the total bandwidth with copper interconnects is challenging, thus it is crucial to introduce optics into the scale-up network. For this purpose, the most important metrics are...

💬 0 commentsarXiv:2601.14342v1PDF
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Posted in math.FA · 2026-01-20 · Vinícius Luz Oliveira, Vladimir G. Pestov

On finite-dimensional encoding/decoding theorems for neural operators

Recently, versions of neural networks with infinite-dimensional affine operators inside the computational units (``neural operator'' networks) have been applied to learn solutions to differential equations. To enable practical computations, one employs finite-dimensional encoding/decoding theorems of the following kind: every...

💬 0 commentsarXiv:2602.00068v1PDF
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Posted in math.NT · 2026-01-20 · Sándor Z. Kiss, Csaba Sándor, Maciej Zakarczemny

On the Diophantine Equation Involving Elementary Symmetric Polynomials and the Decomposition of Unity

We consider the equality of the values of the $n$th and $k$th elementary symmetric polynomials of $n$ not necessarily distinct positive integers. For $k < n$, we prove that this equation always has a solution, but only finitely many solutions. Furthermore, we consider the equality of the values of the $n$th and $(n-2)$th elementary...

💬 0 commentsarXiv:2601.14057v1PDF
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Posted in cs.CV · 2026-01-20 · Andrea Rigo, Luca Stornaiuolo, Weijie Wang, Mauro Martino, Bruno Lepri, Nicu Sebe

POCI-Diff: Position Objects Consistently and Interactively with 3D-Layout Guided Diffusion

We propose a diffusion-based approach for Text-to-Image (T2I) generation with consistent and interactive 3D layout control and editing. While prior methods improve spatial adherence using 2D cues or iterative copy-warp-paste strategies, they often distort object geometry and fail to preserve consistency across edits. To address these...

💬 0 commentsarXiv:2601.14056v1PDF
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Posted in cs.CV · 2026-01-20 · Andrea Protani, Marc Molina Van Den Bosch, Lorenzo Giusti, Heloisa Barbosa Da Silva, Paolo Cacace, Albert Sund Aillet, Miguel Angel Gonzalez Ballester, Friedhelm Hummel, Luigi Serio

Decoder-Free Supervoxel GNN for Accurate Brain-Tumor Localization in Multi-Modal MRI

Modern vision backbones for 3D medical imaging typically process dense voxel grids through parameter-heavy encoder-decoder structures, a design that allocates a significant portion of its parameters to spatial reconstruction rather than feature learning. Our approach introduces SVGFormer, a decoder-free pipeline built upon a...

💬 0 commentsarXiv:2601.14055v1PDF
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Posted in cs.CR · 2026-01-20 · Zhihao Dou, Dongfei Cui, Weida Wang, Anjun Gao, Yueyang Quan, Mengyao Ma, Viet Vo, Guangdong Bai, Zhuqing Liu, Minghong Fang

SecureSplit: Mitigating Backdoor Attacks in Split Learning

Split Learning (SL) offers a framework for collaborative model training that respects data privacy by allowing participants to share the same dataset while maintaining distinct feature sets. However, SL is susceptible to backdoor attacks, in which malicious clients subtly alter their embeddings to insert hidden triggers that...

💬 0 commentsarXiv:2601.14054v2PDF
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Posted in math.GM · 2026-01-20 · Masanori Nakazato

The Fourth Geometry II: From Angle Axioms to Metric Foundations

This paper is a sequel to arXiv:2511.01024 (Base 1), where an axiomatic framework for angles and the foundations of difference-angle geometry were introduced. In difference-angle geometry, where the difference of slopes of lines is treated as a primary angular quantity (the difference angle), we reconstruct the focal structure of...

💬 0 commentsarXiv:2605.00001v1PDF
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Posted in cs.LG · 2026-01-20 · Badri N. Patro, Vijay S. Agneeswaran

LLMOrbit: A Circular Taxonomy of Large Language Models -From Scaling Walls to Agentic AI Systems

The field of artificial intelligence has undergone a revolution from foundational Transformer architectures to reasoning-capable systems approaching human-level performance. We present LLMOrbit, a comprehensive circular taxonomy navigating the landscape of large language models spanning 2019-2025. This survey examines over 50 models...

💬 0 commentsarXiv:2601.14053v2PDF
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Posted in cs.CV · 2026-01-20 · Haoran Xu, Yanlin Liu, Zizhao Tong, Jiaze Li, Kexue Fu, Yuyang Zhang, Longxiang Gao, Shuaiguang Li, Xingyu Li, Yanran Xu, Changwei Wang

Vision Also You Need: Navigating Out-of-Distribution Detection with Multimodal Large Language Model

Out-of-Distribution (OOD) detection is a critical task that has garnered significant attention. The emergence of CLIP has spurred extensive research into zero-shot OOD detection, often employing a training-free approach. Current methods leverage expert knowledge from large language models (LLMs) to identify potential outliers....

💬 0 commentsarXiv:2601.14052v1PDF
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Posted in cs.CL · 2026-01-20 · Peter Devine, Mardhiyah Sanni, Farid Adilazuarda, Julieta Gil Loizaga, Barry Haddow

Kakugo: Distillation of Low-Resource Languages into Small Language Models

We present Kakugo, a novel and cost-effective pipeline designed to train general-purpose Small Language Models (SLMs) for low-resource languages using only the language name as input. By using a large teacher model to generate synthetic prompts and translate instruction datasets, we produced training data and SLMs for 54 low-resource...

💬 0 commentsarXiv:2601.14051v1PDF
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Posted in cs.RO · 2026-01-20 · André Helgert, Carolin Straßmann, Sabrina C. Eimler

A Decade of Human-Robot Interaction Through Immersive Lenses: Reviewing Extended Reality as a Research Instrument in Social Robotics

Over the past decade, Extended Reality (XR), including Virtual, Augmented, and Mixed Reality, gained attention as a research instrument in human-robot interaction studies, but remains underexplored in empirical investigations of social robotics. To map the field, we systematically reviewed empirical studies from 2015 to 2025. Of 6,527...

💬 0 commentsarXiv:2602.15840v2PDF
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Posted in cs.CL · 2026-01-20 · Yuxin Chen, Zhengzhou Cai, Xiangtian Ji, Weixiang Zhao, An Zhang, Xiang Wang, Tat-Seng Chua

Understanding Multilingualism in Mixture-of-Experts LLMs: Routing Mechanism, Expert Specialization, and Layerwise Steering

Mixture-of-Experts (MoE) architectures have shown strong multilingual capabilities, yet the internal mechanisms underlying performance gains and cross-language differences remain insufficiently understood. In this work, we conduct a systematic analysis of MoE models, examining routing behavior and expert specialization across...

💬 0 commentsarXiv:2601.14050v1PDF
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Posted in stat.ME · 2026-01-20 · Elena Dumitrescu, Julien Peignon, Arthur Thomas

Tail-Aware Density Forecasting of Locally Explosive Time Series: A Neural Network Approach

This paper proposes a Mixture Density Network specifically designed for forecasting time series that exhibit locally explosive behavior. By incorporating skewed t-distributions as mixture components, our approach offers enhanced flexibility in capturing the skewed, heavy-tailed, and potentially multimodal nature of predictive...

💬 0 commentsarXiv:2601.14049v2PDF
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Posted in hep-ph · 2026-01-20 · Sahabub Jahedi, Jin-Han Liang, Yi Liao, Xiao-Dong Ma, Yoshiki Uchida

A systematic study of lepton flavor violating dark matter interactions via indirect detection in effective field theories

Lepton flavor violating (LFV) interactions involving dark matter (DM) particles remain a largely unexplored area. In this study, we systematically investigate LFV DM interactions within the framework of effective field theories by analyzing astrophysical photons and positrons produced from DM annihilation. Employing the astrophysical...

💬 0 commentsarXiv:2601.14048v1PDF
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Posted in cs.GT · 2026-01-20 · Alexey V. Osipov, Nikolay N. Osipov

Collective intelligence in science: direct elicitation of diverse information from experts with unknown information structure

Suppose we need a deep collective analysis of an open scientific problem: there is a complex scientific hypothesis and a large online group of mutually unrelated experts with relevant private information of a diverse and unpredictable nature. This information may be results of experts' individual experiments, original reasoning of...

💬 0 commentsarXiv:2601.14047v2PDF