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📳 Physicists solve 90-year-old puzzle of quantum damped harmonic oscillators
#physics

Physicists solve 90-year-old puzzle of quantum damped harmonic oscillators
A plucked guitar string can vibrate for seconds before falling silent. A playground swing, emptied of its passenger, will gradually come to rest. These are what physicists call "damped harmonic oscillators" and are well understood in terms of Newton's laws of motion.

JWST reveals a supernova following a gamma-ray burst at z $\simeq$ 7.3
A. J. Levan, B. Schneider, E. Le Floc'h, G. Brammer, N. R. Tanvir, D. B. Malesani, A. Martin-Carrillo, A. Rossi, A. Saccardi, A. Sneppen, S. D. Vergani, J. An, J. -L. Atteia, F. E. Bauer, V. Buat, S. Campana, A. Chrimes, B. Cordier, L. Cotter, F. Daigne, V. D'Elia, M. De Pasquale, A. de Ugarte Postigo, G. Corcoran, R. A. J. Eyles-Ferris, H. Fausey, A. S. Fruchter, O. Godet, B. P. Gompertz, D. Gotz, N. Habeeb…

JWST reveals a supernova following a gamma-ray burst at z $\simeq$ 7.3
The majority of energetic long-duration gamma-ray bursts (GRBs) are thought to arise from the collapse of massive stars, making them powerful tracers of star formation across cosmic time. Evidence for this origin comes from the presence of supernovae in the aftermath of the GRB event, whose properties in turn link back to those of the collapsing star. In principle, with GRBs we can study the properties of individual stars in the distant universe. Here, we present JWST/NIRCAM observations that d…

Energy-Resolved EBSD using a Monolithic Direct Electron Detector
Nicol\`o M. Della Ventura, Kalani Moore, McLean P. Echlin, Matthew R. Begley, Tresa M. Pollock, Marc De Graef, Daniel S. Gianola
https://arxiv.org/abs/2507.20105

Energy-Resolved EBSD using a Monolithic Direct Electron Detector
Accurate quantification of the energy distribution of backscattered electrons (BSEs) contributing to electron backscatter diffraction (EBSD) patterns remains as an active challenge. This study introduces an energy-resolved EBSD methodology based on a monolithic active pixel sensor direct electron detector and an electron-counting algorithm to enable the energy quantification of individual BSEs, providing direct measurements of electron energy spectra within diffraction patterns. Following detec…

Component groups for non-supercuspidal $L$-parameters for $p$-adic $\mathrm{SL}_3$
Kwangho Choiy, Doyon Kim, Razan Taha, Pan Yan
https://arxiv.org/abs/2507.20946 https://…

Component groups for non-supercuspidal $L$-parameters for $p$-adic $\mathrm{SL}_3$
We explicitly classify all the component groups associated to the non-supercuspidal, tempered $L$-parameters of $\mathrm{SL}_3(F)$ for a $p$-adic field $F$ of characteristic $0$ by direct case-by-case computations in $\mathrm{PGL}_3(\mathbb{C})$, following earlier work for $\mathrm{SL}_2$ by Labesse-Langlands and Shelstad.

Found an app called “Octave Coffee”. It’s an opinionated timer for pourover coffee. Tells you how much to pour, then how much to wait, and so on. And it has a cute pixel art kitty.
The problem is… it negs you while doing it, and your reward at the end for following the instructions is the message, “You actually listened. Shocking.”
I did it twice. It doesn’t vary.
So… I’m deleting it, even though I found it useful, because I don’t want to be insulted first thing in the morn…

Super-Resolution Radiography by Mechanical Supersampling and Model-Based Iterative Reconstruction using High-Z Photon-Counting Detectors
Moritz Weigt, Karl Hugo E. Helin, Nicolas Karl Fix, Peter Bronsert, Frank Goldschmidtb\"oing, Thomas Thuering, Matthias Habl, Spyridon Gkoumas, Thomas Stein, Paul Martin Fleing, Thomas Billoud, Jakob Neubauer, Dominik von Elverfeldt, Martin Peter Pichotka

Super-Resolution Radiography by Mechanical Supersampling and Model-Based Iterative Reconstruction using High-Z Photon-Counting Detectors
This study presents a practical and dose-efficient strategy for resolution enhancement in planar radiography, based on mechanically supersampled acquisition with high-Z photon-counting detectors (PCDs). Unlike prior event-based or cluster methods, our approach operates in true photon-counting mode and supports clinical flux rates. Using detector trajectories spanning multiple pixels and image registration-based shift estimation, we achieve sub-pixel sampling without requiring mechanical precisi…

Could Terrell Edmunds Complete The Las Vegas Raiders’ Puzzle? https://raiderramble.com/2025/08/11/could-terrell-edmunds-complete-the-las-vegas-raiders-puzzle/

I was reminded again why it takes more than a feeling to get #Connections right, even when the hurried, obvious answer is waiting there for you. I nearly bit the dust by falling for a barracuda of a red herring.
#Connections734
Puzzle № 734
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For those who think that going out is the wrong thing to do today: Here's a quick puzzle for you.
#MathPuzzle #ScientificAmerican #DicePuzzle

High-gain model-following control for trajectory tracking
Nicals Tietze, Kai Wulff, Johann Reger
https://arxiv.org/abs/2506.13463 https://

High-gain model-following control for trajectory tracking
We consider trajectory tracking for minimum-phase nonlinear systems in Byrnes-Isidori form using the model-following control (MFC) architecture. The tracking problem is motivated by a hierarchical control concept where a higher-level instance provides the reference trajectory at run-time. We present a computational efficient implementation of the feedback linearisation MFC design, and apply high-gain feedback in the process control loop (PCL) to achieve practical tracking in presence of Lipschi…