Tootfinder

Card Dealing Math
Eric Huang, Tanya Khovanova, Timur Kilybayev, Ryan Li, Brandon Ni, Leone Seidel, Samarth Sharma, Nathan Sheffield, Vivek Varanasi, Alice Yin, Boya Yun, William Zelevinsky
https://arxiv.org/abs/2509.11395

Card Dealing Math
Various card tricks involve under-down dealing, where alternatively one card is placed under the deck and the next card is dealt. We study how the cards need to be prepared in the deck to be dealt in order. The order in which the $N$ cards are prepared defines a permutation. In this work, we analyze general dealing patterns, considering properties of the resulting permutations. We give recursive formulas for these permutations, their inverses, the final dealt card, and the dealing order of th…

Resolving the Bulk-Boundary Correspondence Paradox on Low-Symmetry Surfaces of Weyl Semimetals
Cong Li, Zhilong Yang, Hongxiong Liu, Magnus H. Berntsen, Francesco Scali, Dibya Phuyal, Jianfeng Zhang, Timur K. Kim, Jacek Osiecki, Balasubramanian Thiagarajan, Youguo Shi, Tao Xiang, Quansheng Wu, Oscar Tjernberg
https://arxiv.org/abs/2509.101…

Resolving the Bulk-Boundary Correspondence Paradox on Low-Symmetry Surfaces of Weyl Semimetals
Low-symmetry surfaces of topological semimetals offer access to boundary phenomena hidden on conventional facets, yet systematic studies remain scarce due to experimental challenges and the lack of a general framework for reconciling bulk and surface periodicities. Here, we investigate the (103) surface of the Weyl semimetal NdAlSi using angle resolved photoemission spectroscopy and density functional theory. The (103) surface is an example of a low symmetry surface that presents an apparent pa…

Open-sci-ref-0.01: open and reproducible reference baselines for language model and dataset comparison
Marianna Nezhurina, Taishi Nakamura, Timur Carstensen, Niccol\`o Ajroldi, Ville Komulainen, David Salinas, Jenia Jitsev
https://arxiv.org/abs/2509.09009

Open-sci-ref-0.01: open and reproducible reference baselines for language model and dataset comparison
We introduce open-sci-ref, a family of dense transformer models trained as research baselines across multiple model (0.13B to 1.7B parameters) and token scales (up to 1T) on 8 recent open reference datasets. Evaluating the models on various standardized benchmarks, our training runs set establishes reference points that enable researchers to assess the sanity and quality of alternative training approaches across scales and datasets. Intermediate checkpoints allow comparison and studying of the …

Feuer in Regierungsgebäude in Kiew
Nach einem russischen Angriff auf Kiew ist ukrainischen Angaben zufolge ein Feuer im Regierungsgebäude der Ukraine ausgebrochen. Das Gebäude des Kabinetts befinde sich im Bezirk Petschersk, teilte der Chef der Militärverwaltung der Hauptstadt, Timur Tkatschenko, mit. Bislang lässt sich nicht unabhängig überprüfen, ob das Gebäude direkt von einer Rakete getroffen wurde oder ob herabfallende T…
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Ukraine-Liveblog: ++ Neuer Angriff auf Druschba-Pipeline gemeldet ++
Das ukrainische Militär hat eigenen Angaben zufolge erneut die Druschba-Ölpipeline angegriffen. Der Grünen-Politiker Hofreiter fordert, dass sich deutsche Soldaten an einer möglichen Sicherheitsgarantie für die Ukraine beteiligen.

Top Russian defense official gets 13 years in graft crackdown: https://benborges.xyz/2025/07/02/top-russian-defense-official-gets.html

Excess Observables Reveal Nonreciprocity in Integrated Covariance
Timur Aslyamov, Massimiliano Esposito
https://arxiv.org/abs/2507.07876 https://

Excess Observables Reveal Nonreciprocity in Integrated Covariance
Near equilibrium, the symmetric part of the time-integrated steady-state covariance, i.e., the time integral of correlation functions, is governed by the fluctuation-dissipation theorem, while the antisymmetric part vanishes due to Onsager reciprocity. Far from equilibrium, where these principles no longer apply, we develop a unified formalism for both symmetric and antisymmetric components of integrated covariances. We derive exact, computationally tractable expressions for these quantities, v…

Casimir-Lifshitz theory for cavity-modification of ground-state energy
Oleg V. Kotov, Johannes Feist, Francisco J. Garc\'ia-Vidal, Timur O. Shegai
https://arxiv.org/abs/2509.05156

Casimir-Lifshitz theory for cavity-modification of ground-state energy
A theory for ground-state modifications of matter embedded in a Fabry-Perot cavity and whose excitations are described as harmonic oscillators is presented. Based on Lifshitz's theory for vacuum energy and employing a Lorentz model for the material permittivity, a non-perturbative macroscopic QED model was built that accounts for the infinite number of cavity modes with a continuum of their wavevectors. Differences from the commonly used single-mode Hopfield Hamiltonian are revealed. The non-re…

Radio continuum and \HI 21-cm line observations of a nearby luminous infrared galaxy IRAS 17526 3253
Jianfeng Wu, Zhongzu Wu, Yulia Sotnikova, Bo Zhang, Yongjun Chen, Timur Mufakharov, Zhiqiang Shen
https://arxiv.org/abs/2508.06075

Radio continuum and \HI 21-cm line observations of a nearby luminous infrared galaxy IRAS 17526+3253
We present results from our EVN and GMRT observations of the radio continuum and spectral line emission in IRAS 17526+3253, along with an analysis of its arcsecond-scale radio properties using archival VLA data. The EVN observations detected radio continuum emission from both the northwest (NW) and southeast (SE) nuclei. The NW nucleus shows two components with high brightness temperatures and radio luminosities, likely indicating the presence of an AGN core and jet. Meanwhile, our EVN observat…

Dark states of electrons in a quantum system with two pairs of sublattices
Yoonah Chung, Minsu Kim, Yeryn Kim, Seyeong Cha, Joon Woo Park, Jeehong Park, Yeonjin Yi, Dongjoon Song, Jung Hyun Ryu, Kimoon Lee, Timur K. Kim, Cephise Cacho, Jonathan Denlinger, Chris Jozwiak, Eli Rotenberg, Aaron Bostwick, Keun Su Kim
https://arxiv.or…

Dark states of electrons in a quantum system with two pairs of sublattices
A quantum state of matter that is forbidden to interact with photons and is therefore undetectable by spectroscopic means is called a dark state. This basic concept can be applied to condensed matter where it suggests that a whole band of quantum states could be undetectable across a full Brillouin zone. Here we report the discovery of such condensed matter dark states in palladium diselenide as a model system that has two pairs of sublattices in the primitive cell. By using angle-resolved phot…

Replaced article(s) found for math.DS. https://arxiv.org/list/math.DS/new
[1/1]:
- A quasi-energy function for Pixton diffeomorphisms defined by generalized Mazur knots
Timur Medvedev, Olga Pochinka

PixelNav: Towards Model-based Vision-Only Navigation with Topological Graphs
Sergey Bakulin, Timur Akhtyamov, Denis Fatykhov, German Devchich, Gonzalo Ferrer
https://arxiv.org/abs/2507.20892

PixelNav: Towards Model-based Vision-Only Navigation with Topological Graphs
This work proposes a novel hybrid approach for vision-only navigation of mobile robots, which combines advances of both deep learning approaches and classical model-based planning algorithms. Today, purely data-driven end-to-end models are dominant solutions to this problem. Despite advantages such as flexibility and adaptability, the requirement of a large amount of training data and limited interpretability are the main bottlenecks for their practical applications. To address these limitation…

Angriff auch auf Kiew
Nach Angaben des ukrainischen Militärs hat die Ukraine auch einen russischen Luftangriff auf die Hauptstadt Kiew abgewehrt. "Die Luftabwehr ist in Kiew im Einsatz! Bleiben Sie in den Schutzräumen, bis Entwarnung gegeben wird!", teilte Timur Tkachenko, Leiter der Militärverwaltung von Kiew, bei Telegram mit.
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Experimental realization of dice-lattice flat band at the Fermi level in layered electride YCl
Songyuan Geng, Xin Wang, Risi Guo, Chen Qiu, Fangjie Chen, Qun Wang, Kangjie Li, Peipei Hao, Hanpu Liang, Yang Huang, Yunbo Wu, Shengtao Cui, Zhe Sun, Timur K. Kim, Cephise Cacho, Daniel S. Dessau, Benjamin T. Zhou, Haoxiang Li
https://arxiv.org/…

Experimental realization of dice-lattice flat band at the Fermi level in layered electride YCl
Flat electronic bands, where interactions among electrons overwhelm their kinetic energies, hold the promise for exotic correlation physics. The dice lattice has long been theorized as a host of flat bands with intriguing band topology. However, to date, no material has ever been found to host the characteristic flat bands of a dice lattice. Here, using angle-resolved photoemission spectroscopy (ARPES), we discover a dice-lattice flat band at $E_F$ in the van der Waals (vdW) electride [YCl]$^{2…

Russia's 'largest and most secret' drone factory showcased in Kremlin-media propaganda video: https://benborges.xyz/2025/07/21/russias-largest-and-most-secret.html

Machine learning-based classification of variable stars using phase-folded light curves
Almat Akhmetali, Alisher Zhunuskanov, Timur Namazbayev, Marat Zaidyn, Aknur Sakan, Dana Turlykozhayeva, Nurzhan Ussipov
https://arxiv.org/abs/2508.11964

Machine learning-based classification of variable stars using phase-folded light curves
Classifying variable stars is crucial for advancing our understanding of stellar evolution and dynamics. As large-scale surveys generate increasing volumes of light curve data, the demand for automated and reliable classification techniques continues to grow. Traditional methods often rely on manual feature extraction and selection, which can be labor-intensive and less effective for managing extensive datasets. In this study, we present a convolutional neural network (CNN)-based method for cla…

Room temperature spin injection into commercial VCSELs at non-resonant wavelengths
Timur Almabetov, Petros Androvitsaneas, Zhongze Ren, Andrew Young, Ruth Oulton, Edmund Harbord
https://arxiv.org/abs/2506.18376

Room temperature spin injection into commercial VCSELs at non-resonant wavelengths
Spin lasers leverage electron spin-polarisation to control photon polarisation, offering the potential for lower thresholds, rapid modulation, and all-optical data processing. We report successful spin injection into a commercial Vertical Cavity Surface Emitting Laser (VCSEL) using optical pumping at wavelengths of 794 nm and 810 nm. Maximum circular polarisation achieved was about 20% at 794 nm, whereas this falls to 5% with exciting at 810 nm. We attribute this to reduced spin injection due t…

Quantifying Spin Defect Density in hBN via Raman and Photoluminescence Analysis
Atanu Patra, Paul Konrad, Andreas Sperlich, Timur Biktagirov, Wolf Gero Schmidt, Lesley Spencer, Igor Aharonovich, Sven H\"ofling, Vladimir Dyakonov
https://arxiv.org/abs/2506.19803

Quantifying Spin Defect Density in hBN via Raman and Photoluminescence Analysis
Negatively charged boron vacancies ($\mathrm{V_B^-}$) in hexagonal boron nitride (hBN) are emerging as promising solid-state spin qubits due to their optical accessibility, structural simplicity, and compatibility with photonic platforms. However, quantifying the density of such defects in thin hBN flakes has remained elusive, limiting progress in device integration and reproducibility. Here, we present an all-optical method to quantify $\mathrm{V_B^-}$ defect density in hBN by correlating Rama…

Advanced SQUID-on-lever scanning probe for high-sensitivity magnetic microscopy with sub-100-nm spatial resolution
Timur Weber (University of T\"ubingen), Daniel Jetter (University of Basel), Jan Ullmann (University of T\"ubingen), Simon A. Koch (University of T\"ubingen), Simon F. Pfander (University of T\"ubingen), Katharina Kress (University of Basel), Andriani Vervelaki (University of Basel), Boris Gross (University of Basel), Oliver Kieler (PTB Braunschweig), U…

Advanced SQUID-on-lever scanning probe for high-sensitivity magnetic microscopy with sub-100-nm spatial resolution
Superconducting quantum interference devices (SQUIDs) are exceptionally sensitive magnetometers capable of detecting weak magnetic fields. Miniaturizing these devices and integrating them onto scanning probes enables high-resolution imaging at low-temperature. Here, we fabricate nanometer-scale niobium SQUIDs with inner-loop sizes down to 10 nm at the apex of individual planar silicon cantilevers via a combination of wafer-scale optical lithography and focused-ion-beam (FIB) milling. These robu…

Stellar Mass Assembly History of Massive Quiescent Galaxies since $z\sim4$: Insights from Spatially Resolved SED Fitting with JWST Data
Novan Saputra Haryana, Masayuki Akiyama, Abdurro'uf, Hesti Retno Tri Wulandari, Juan Pablo Alfonzo, Kianhong Lee, Naoki Matsumoto, Ryo Albert Sutanto, Muhammad Nur Ihsan Effendi, Itsna Khoirul Fitriana, Ibnu Nurul Huda, Anton Timur Jaelani, Sultan Hadi Kusuma, Lucky Puspitarini, Dian Puspita Triani

Stellar Mass Assembly History of Massive Quiescent Galaxies since $z\sim4$: Insights from Spatially Resolved SED Fitting with JWST Data
Massive quiescent galaxies at high redshift show significantly more compact morphology than their local counterparts. To examine their internal structure across a wide redshift range and investigate potential redshift dependence, we performed spatially resolved SED fitting using pixedfit software on massive $(\log(M_*/M_\odot)\sim11)$ quiescent galaxies at $0