Tootfinder

Geometric spectral properties of electromagnetic waveguides
Philippe Briet (EPSILON), Maxence Cassier (EPSILON), Thomas Ourmi\`eres-Bonafos (I2M), Michele Zaccaron (EPSILON)
https://arxiv.org/abs/2508.13591

Geometric spectral properties of electromagnetic waveguides
Consider a reference homogeneous and isotropic electromagnetic waveguide with a simply connected cross-section embedded in a perfect conductor. In this setting, when the waveguide is straight, the spectrum of the associated self-adjoint Maxwell operator with a constant twist (which may be zero) lies on the real line and is symmetric with respect to zero and exhibits a spectral gap around the origin. Moreover, the spectrum is purely essential, and contains 0 which is an eigenvalue of infinite mu…

🇺🇦 #NowPlaying on KEXP's #AfternoonShow
Polyrhythmics:
🎵 Cake Lady
#Polyrhythmics
https://polyrhythmics.bandcamp.com/track/cake-lady
https://open.spotify.com/track/4ebc94YIl9lLO9CwJ0lHvc

Large-order perturbation theory of linear eigenvalue problems
Stephen Jonathan Chapman
https://arxiv.org/abs/2509.14763 https://arxiv.org/pdf/2509.14763

Large-order perturbation theory of linear eigenvalue problems
We consider a class of linear eigenvalue problems depending on a small parameter epsilon in which the series expansion for the eigenvalue in powers of epsilon is divergent. We develop a new technique to determine the precise nature of this divergence. We illustrate the technique through its application to four examples: the anharmonic oscillator, a simplified model of equitorially-trapped Rossby waves, and two simplified models based on quasinormal modes of Reissner-Normstrom de Sitterblack hol…

There is an e-bike Lending Library...
#ebike #biking

Community Pedal Power E-Bike Lending Library
A free e-bike lending library serving Cambridge, Somerville, and the surrounding area.

Microsoft says U.S. law takes precedence over Canadian data sovereignty
https://flip.it/EIBZjL

🇺🇦 #NowPlaying on BBCRadio3's #Breakfast
Johann Sebastian Bach, Monteverdi Choir, English Baroque Soloists & Sir John Eliot Gardiner:
🎵 Ach Gott, vom Himmel sieh darein (Cantata No 2)
#JohannSebastianBach
https://open.spotify.com/track/30B3dApEpqL2U6rFgsL90M

Hybrid Deep Reconstruction for Vignetting-Free Upconversion Imaging through Scattering in ENZ Materials
Hao Zhang, Yang Xu, Wenwen Zhang, Saumya Choudhary, M. Zahirul Alam, Long D. Nguyen, Matthew Klein, Shivashankar Vangala, J. Keith Miller, Eric G. Johnson, Joshua R. Hendrickson, Robert W. Boyd, Sergio Carbajo
https://arxiv.org/abs/2508.…

Hybrid Deep Reconstruction for Vignetting-Free Upconversion Imaging through Scattering in ENZ Materials
Optical imaging through turbid or heterogeneous environments (collectively referred to as complex media) is fundamentally challenged by scattering, which scrambles structured spatial and phase information. To address this, we propose a hybrid-supervised deep learning framework to reconstruct high-fidelity images from nonlinear scattering measurements acquired with a time-gated epsilon-near-zero (ENZ) imaging system. The system leverages four-wave mixing (FWM) in subwavelength indium tin oxide (…

An $\epsilon$-Regularity Theorem for Non-collapsed Ricci Flow
Harry Fluck, Max Hallgren
https://arxiv.org/abs/2509.14154 https://arxiv.org/pdf/2509.14154…

An $ε$-Regularity Theorem for Non-collapsed Ricci Flow
In this article we prove an $ε$-regularity theorem for non-collapsed Ricci flows, and use this to prove new estimates for singularity models of Fano Kähler-Ricci flows. In the course of our proof, we find a criterion for uniform convergence of solutions to the heat equation along a sequence of $\mathbb{F}$-converging Ricci flows, and apply this to new parabolic regularizations of some natural geometric quantities.

Vigilance sur les #DDS et données persos https://www.epsiloon.com/tous-les-numeros/n51/ia_la_faille/ et les "attaques par injection indirecte de prompts" ou commandes : ces IA ont…

IA : La faille
Les chercheurs s’étonnent de la facilité avec laquelle ils réussissent, en laboratoire, à détourner les grands modèles de langage. Et ils s’inquiètent : ni les États, ni les entreprises ne semblent...

🇺🇦 #NowPlaying on KEXP's #AfternoonShow
Polyrhythmics:
🎵 Cake Lady
#Polyrhythmics
https://polyrhythmics.bandcamp.com/track/cake-lady
https://open.spotify.com/track/4ebc94YIl9lLO9CwJ0lHvc