Tootfinder

The Darkfield Approach to Measuring Vacuum Birefringence and Light-by-Light Couplings -- A Proof-of-Principle Experiment
Michal Sm\'id, Pooyan Khademi, Carsten B\"ahtz, Erik Brambrink, Jindrich Chalupsky, Tom E. Cowan, Samuele Di Dio Cafiso, Sebastian G\"ode, J\"org Grenzer, Vera Hajkova, Peter Hilz, Willi Hippler, Hauke H\"opner, Alzbeta Horynova, Oliver Humphries, Simon Jelinek, Libor Juha, Felix Karbstein, Alejandro Laso-Garcia, Robert L\"otzsch, Aim\…

The Darkfield Approach to Measuring Vacuum Birefringence and Light-by-Light Couplings -- A Proof-of-Principle Experiment
Vacuum fluctuations give rise to effective nonlinear interactions between electromagnetic fields. These generically modify the characteristics of light traversing a strong-field region. X-ray free-electron lasers constitute a particularly promising probe, due to their brilliance, the possibility of precise control and favourable frequency scaling. However, the nonlinear vacuum response is very small even when probing a tightly focused high-intensity laser field with XFEL radiation and direct me…

The Freight Multimodal Transport Problem with Buses and Drones: An Integrated Approach for Last-Mile Delivery
E Su, Hu Qin, Jiliu Li, Rui Zhang
https://arxiv.org/abs/2506.10311

The Freight Multimodal Transport Problem with Buses and Drones: An Integrated Approach for Last-Mile Delivery
This paper proposes a novel freight multimodal transport problem with buses and drones, where buses are responsible for transporting parcels to lockers at bus stops for storage, while drones are used to deliver each parcel from the locker to the corresponding customer. The integrated bus-drone system synergistically expands drone service coverage using the bus network to ensure efficient final delivery. Minimizing the total operational costs while satisfying customer demands necessitates the jo…

Hearing Hands: Generating Sounds from Physical Interactions in 3D Scenes
Yiming Dou, Wonseok Oh, Yuqing Luo, Antonio Loquercio, Andrew Owens
https://arxiv.org/abs/2506.09989

Hearing Hands: Generating Sounds from Physical Interactions in 3D Scenes
We study the problem of making 3D scene reconstructions interactive by asking the following question: can we predict the sounds of human hands physically interacting with a scene? First, we record a video of a human manipulating objects within a 3D scene using their hands. We then use these action-sound pairs to train a rectified flow model to map 3D hand trajectories to their corresponding audio. At test time, a user can query the model for other actions, parameterized as sequences of hand pos…

A Data-driven Predictive Control Architecture for Train Thermal Energy Management
Ahmed Aboudonia, Johannes Estermann, Keith Moffat, Manfred Morari, John Lygeros
https://arxiv.org/abs/2506.09187

A Data-driven Predictive Control Architecture for Train Thermal Energy Management
We aim to improve the energy efficiency of train climate control architectures, with a focus on a specific class of regional trains operating throughout Switzerland, especially in Zurich and Geneva. Heating, Ventilation, and Air Conditioning (HVAC) systems represent the second largest energy consumer in these trains after traction. The current architecture comprises a high-level rule-based controller and a low-level tracking controller. To improve train energy efficiency, we propose adding a mi…

Some features in 4-level generation in LIPLs
Lev Nagli, Kirill Kulikov, Dima Cheskis
https://arxiv.org/abs/2506.07220 https://arxiv.o…

Some features in 4-level generation in LIPLs
This paper shows that in Laser-Induced Plasma Lasers (LIPL), the collisionally assisted transitions that lead to the inversion population on an upper-generation level E_up may be partly forbidden. The spin-orbit coupling may increase the oscillator strength of such transitions. It also demonstrates that collisions between electrons and excited atoms can strongly increase the atoms' energy, creating a population inversion at the E_up level, which may lie about 1 eV above the …

A Reassessment of the Pantheon and DES 5YR Calibration Uncertainties: Dovekie
B. Popovic, W. D. Kenworthy, M. Ginolin, A. Goobar, P. Shah, B. M. Boyd, A. Do, D. Brout, D. Scolnic, M. Vincenzi, S. Dhawan, D. O. Jones, M. Smith, M. Rigault, B. Racine, E. E. Hayes, R. Chen, P. Wiseman, L. Galbany, M. Grayling, L. LaCroix, C. Barjou-Delayre, D. Kuhn, C. Lemon

A Reassessment of the Pantheon+ and DES 5YR Calibration Uncertainties: Dovekie
Type Ia Supernovae (SNe Ia) are crucial tools to measure the accelerating expansion of the universe, comprising thousands of SNe across multiple telescopes. Accurate measurements of cosmological parameters with SNe Ia require a robust understanding and cross-calibration of the telescopes and filters. A previous cross-calibration effort, 'Fragilistic', provided 25 photometric systems, but offered no public code or ability to add new surveys. We provide an open-source cross-calibration solution, …

This https://arxiv.org/abs/2502.20014 has been replaced.
initial toot: https://mastoxiv.page/@arX…

Monitoring microplastics in live reef-building corals with microscopic laser particles
Micro- and nanoplastics pose a growing threat to reef-building corals. Yet, understanding of their uptake, interaction with coral tissue and long-term incorporation into coral skeletons remains limited in large part due to the invasive nature of existing methods for monitoring and localizing microplastic. Here, we repurpose optical resonances in polymer spheres to transform microplastic particles into microscopic lasers. These laser particles emit distinctive and stable spectral signatures that…

Optical absorption in hexagonal-diamond Si and Ge nanowires: insights from STEM-EELS experiments and ab initio theory
Luiz H. G. Tizei, Michele Re Fiorentin, Thomas Dursap, Theodorus M. van den Berg, Marc T\'unica, Maurizia Palummo, Mathieu Kociak, Laetitia Vincent, Michele Amato
https://arxiv.org/abs/2506.10543

Optical absorption in hexagonal-diamond Si and Ge nanowires: insights from STEM-EELS experiments and ab initio theory
Hexagonal-diamond (2H) group IV nanowires are key for advancing group IV-based lasers, quantum electronics, and photonics. Understanding their dielectric response is crucial for performance optimization, but their optical absorption properties remain unexplored. We present the first comprehensive study of optical absorption in 2H-Si and 2H-Ge nanowires, combining high-resolution STEM, monochromated EELS, and ab initio simulations. The nanowires, grown in situ in a TEM as nanobranches on GaAs st…

Brillouin-Mandelstam scattering in telecommunications optical fiber at millikelvin temperatures
E. A. Cryer-Jenkins, A. C. Leung, H. Rathee, A. K. C. Tan, K. D. Major, M. R. Vanner
https://arxiv.org/abs/2506.09654

Brillouin-Mandelstam scattering in telecommunications optical fiber at millikelvin temperatures
Brillouin-Mandelstam scattering is a strong and readily accessible optical nonlinearity enabling a wide array of applications and research directions. For instance, the three-wave mixing process has been employed to great success for narrow-linewidth lasers, sensing applications, microscopy, and signal processing. While most of these avenues focus on room temperature operation, there is now increasing interest in cryogenic operation owing to the scattering mechanism's significant potential for …

Cartesian Forest Matching
Bastien Auvray, Julien David, Richard Groult, Thierry Lecroq
https://arxiv.org/abs/2506.02704 https://arxiv…

Cartesian Forest Matching
In this paper, we introduce the notion of Cartesian Forest, which generalizes Cartesian Trees, in order to deal with partially ordered sequences. We show that algorithms that solve both exact and approximate Cartesian Tree Matching can be adapted to solve Cartesian Forest Matching in average linear time. We adapt the notion of Cartesian Tree Signature to Cartesian Forests and show how filters can be used to experimentally improve the algorithm for the exact matching. We also show a one to one c…