Tootfinder

Miniaturized Chaos-assisted Spectrometer
Yujia Zhang, Chaojun Xu, Zhenyu Zhao, Yikai Su, Xuhan Guo
https://arxiv.org/abs/2506.15186 https://

Miniaturized Chaos-assisted Spectrometer
Computational spectrometers are at the forefront of spectroscopy, promising portable, on-chip, or in-situ spectrum analysis through the integration of advanced computational techniques into optical systems. However, existing computational spectrometer systems have yet to fully exploit optical properties due to imperfect spectral responses, resulting in increased system complexity and compromised performance in resolution, bandwidth, and footprint. In this study, we introduce optical chaos into …

SpecDetect: Simple, Fast, and Training-Free Detection of LLM-Generated Text via Spectral Analysis
Haitong Luo, Weiyao Zhang, Suhang Wang, Wenji Zou, Chungang Lin, Xuying Meng, Yujun Zhang
https://arxiv.org/abs/2508.11343

SpecDetect: Simple, Fast, and Training-Free Detection of LLM-Generated Text via Spectral Analysis
The proliferation of high-quality text from Large Language Models (LLMs) demands reliable and efficient detection methods. While existing training-free approaches show promise, they often rely on surface-level statistics and overlook fundamental signal properties of the text generation process. In this work, we reframe detection as a signal processing problem, introducing a novel paradigm that analyzes the sequence of token log-probabilities in the frequency domain. By systematically analyzing …

Codimension two spacelike submanifolds into null hypersurfaces of generalized Robertson-Walker spacetimes
Luis J. Alias, Josue Melendez, Matias Navarro, Didier A. Solis
https://arxiv.org/abs/2508.13852

Codimension two spacelike submanifolds into null hypersurfaces of generalized Robertson-Walker spacetimes
We study codimension two spacelike submanifolds contained into a general class of null hypersurfaces in generalized Robertson-Walker spacetimes, refer to as nullcones. In particular we analyze light cones and lightlike cylinders in Lorentz-Minkowski spacetime, as well as null cones in de Sitter spacetime. We give conditions on a radial coordinate that guarantee that such a spacelike submanifold is conformally diffeomorphic to the hyperbolic space, a round cylinder a sphere; respectively. We als…

From Bill McKibben
https://billmckibben.substack.com/p/shameless-self-promotion/
"I’m proud of my new book and I think it will be helpful. It will be on sale in a few weeks, but it’s available for pre-order now."

A Tale of Two Sightlines: Comparison of Hydrocarbon Dust Absorption Bands toward Cygnus OB2-12 and the Galactic Center
Yvonne J. Pendleton, T. R. Geballe, Laurie E. U. Chu, Marjorie Decleir, Karl D. Gordon, A. G. G. M. Tielens, Louis J. Allamandola, Jeroen Bouwman, J. E. Chiar, Curtis Dewitt, Burcu Gunay, Thomas Henning, Vito Mennella, M. E. Palumbo, Alexey Potapov, Maisie Rashman, Sasha Zeegers

A Tale of Two Sightlines: Comparison of Hydrocarbon Dust Absorption Bands toward Cygnus OB2-12 and the Galactic Center
Infrared spectra of hydrocarbon dust absorption bands toward the bright hypergiant Cygnus OB2-12 are compared to published spectra of the Quintuplet Cluster, a sightline to the Galactic center. The Cyg OB2-12 data include a new ground-based 2.86-3.70 microns spectrum and a previously published, but here further analyzed, spectrum of the 5.50-7.34 microns region. Higher spectral resolution data for the Cyg OB2-12 sightline in the 3 micron region allows a detailed comparison of the 3.4 micron ali…

Generalize across Homophily and Heterophily: Hybrid Spectral Graph Pre-Training and Prompt Tuning
Haitong Luo, Suhang Wang, Weiyao Zhang, Ruiqi Meng, Xuying Meng, Yujun Zhang
https://arxiv.org/abs/2508.11328

Generalize across Homophily and Heterophily: Hybrid Spectral Graph Pre-Training and Prompt Tuning
Graph ``pre-training and prompt-tuning'' aligns downstream tasks with pre-trained objectives to enable efficient knowledge transfer under limited supervision. However, existing methods rely on homophily-based low-frequency knowledge, failing to handle diverse spectral distributions in real-world graphs with varying homophily. Our theoretical analysis reveals a spectral specificity principle: optimal knowledge transfer requires alignment between pre-trained spectral filters and the intrinsic spe…

Observational Analysis of Multi-thermal Counter-streaming Flows in a Forming Filament and Their Relationship with Local Heating at Filament Footpoints
Hongrui Li, Hechao Chen, Chun Xia, Xiaoli Yan, Yongyuan Xiang, Jincheng Wang
https://arxiv.org/abs/2508.12737

Observational Analysis of Multi-thermal Counter-streaming Flows in a Forming Filament and Their Relationship with Local Heating at Filament Footpoints
Utilizing high-resolution imaging and spectroscopic observations from the New Vacuum Solar Telescope (NVST), the Interface Region Imaging Spectrograph (IRIS), and the Solar Dynamics Observatory (SDO), we investigated the nature and origin of counter-streaming flows within a forming active region filament. The ever-present counter-streaming flows observed within the filament are identified as interleaved unidirectional mass flows in opposing directions occurring in neighboring threads. Multi-wav…

"Antifaschismus muss heißen: Gegen jeden Antisemitismus. Egal, ob sich dieser aus dem völkisch-nationalistischen Denken der AfD speist, aus einem immer noch virulenten christlichen Antijudaismus, ob er sich mittels des Islams legitimiert oder – wie in Teilen der Linken – einer gefährlichen Mischung aus regressivem Antikapitalismus und postkolonialen Theorien."

„Antisemitismus ist ideologische Klammer der AfD.“
In seinem neuen Buch analysiert der Publizist und Gewerkschafter Stefan Dietl den Antisemitismus in der AfD. Der sei zentral für die ideologische Ausrichtung der Partei. Für Dietl ist klar: Antisemitismus dient innerhalb der AfD als verbindendes Element verschiedenster Strömungen. Er sei kein Nebenschauplatz. Wir haben mit Dietl über sein Buch, ein mögliches Verbotsverfahren und Antsemitismus jenseits der AfD gesprochen.

A Generalized Genetic Random Field Method for the Genetic Association Analysis of Sequencing Data
Ming Li, Zihuai He, Min Zhang, Xiaowei Zhan, Changshuai Wei, Robert C Elston, Qing Lu
https://arxiv.org/abs/2508.12617

A Generalized Genetic Random Field Method for the Genetic Association Analysis of Sequencing Data
With the advance of high-throughput sequencing technologies, it has become feasible to investigate the influence of the entire spectrum of sequencing variations on complex human diseases. Although association studies utilizing the new sequencing technologies hold great promise to unravel novel genetic variants, especially rare genetic variants that contribute to human diseases, the statistical analysis of high-dimensional sequencing data remains a challenge. Advanced analytical methods are in g…

Spectral analysis of HD 49798, a bright, hydrogen-deficient sdO-type donor star in an accreting X-ray binary
Thomas Rauch (Institute for Astronomy and Astrophysics, Eberhard Karls University, Tuebingen, Germany), Paul Strau{\ss} (Institute for Astronomy and Astrophysics, Eberhard Karls University, Tuebingen, Germany)
https://arx…

Spectral analysis of HD 49798, a bright, hydrogen-deficient sdO-type donor star in an accreting X-ray binary
Context: HD 49798 is a bright ($m_{\rm V} = 8.287$), hot (effective temperature $T_{\rm eff} = 45000$ K) subdwarf star of the spectral type O (sdO). It is the only confirmed sdO-type mass-donor star of an X-ray binary that has a high-mass (1.28 $M_\odot$) white-dwarf or neutron-star primary with a spin period of only 13.2 s. Aims: Since a high-quality spectrum of HD 49798, obtained with the Tübingen Ultraviolet Echelle Spectrometer (TUES), that has never been analyzed before is available in th…