Tootfinder

Intensified optical camera with Timepix4 readout
Erik Hogenbirk, Andrei Nomerotski, Bram Bouwens, Gabriel Diaz, Shazia Farooq, Erik Maddox, Ondrej Matousek, Peter Svihra, Henrique Zanoli
https://arxiv.org/abs/2509.14649

Intensified optical camera with Timepix4 readout
We report the first characterization results of an optical time-stamping camera based on the Timepix4 chip coupled to a fully depleted optical silicon sensor and fast image intensifier, enabling sub-nanosecond scale, time-resolved imaging for single photons. The system achieves an RMS time resolution of 0.27 ns in direct detection mode without the intensifier and from 0.55 to 1.4 ns in the single-photon regime with intensifier for different amplitude-based signal selections. This shows that Tim…

Ah yes, nearly 2am and have finally got audio working on the new T480. Was it too much to ask that when you plug a headphone cable in, the sound gets routed to them? Apparently so!
On the other hand, I've got a new example of the old "Don't give me that stony-faced glare, I'm a user too" cartoon.
I present:

Achieving Robust Channel Estimation Neural Networks by Designed Training Data
Dianxin Luan, John Thompson
https://arxiv.org/abs/2507.12630 https://

Achieving Robust Channel Estimation Neural Networks by Designed Training Data
Channel estimation is crucial in cognitive communications, as it enables intelligent spectrum sensing and adaptive transmission by providing accurate information about the current channel state. However, in many papers neural networks are frequently tested by training and testing on one example channel or similar channels. This is because data-driven methods often degrade on new data which they are not trained on, as they cannot extrapolate their training knowledge. This is despite the fact phy…

Couniversality for C*-algebras of residually finite-dimensional operator algebras
Adam Humeniuk, Christopher Ramsey, Ian Thompson
https://arxiv.org/abs/2507.11824

Couniversality for C*-algebras of residually finite-dimensional operator algebras
The C*-envelope of a non self-adjoint operator algebra is known to encode many properties of the underlying subalgebra. However, the C*-envelope does not always encode the residual finite-dimensionality of an operator algebra. To elucidate this failure, we study couniversal existence in the space of residually finite-dimensional (RFD) C*-algebras attached to a fixed operator algebra. We construct several examples of residually finite-dimensional operator algebras for which there does not exist …

Meek Models Shall Inherit the Earth
Hans Gundlach, Jayson Lynch, Neil Thompson
https://arxiv.org/abs/2507.07931 https://arxiv.org/pdf…

Meek Models Shall Inherit the Earth
The past decade has seen incredible scaling of AI systems by a few companies, leading to inequality in AI model performance. This paper argues that, contrary to prevailing intuition, the diminishing returns to compute scaling will lead to a convergence of AI model capabilities. In other words, meek models (those with limited computation budget) shall inherit the earth, approaching the performance level of the best models overall. We develop a model illustrating that under a fixed-distribution n…

New results from fast timing iLGAD sensor on Timepix4
Daan Oppenhuis (on behalf of the Timepix4 telescope group)
https://arxiv.org/abs/2509.09308 https://a…

New results from fast timing iLGAD sensor on Timepix4
With the High-Luminosity Large Hadron Collider (HL-LHC) the number of collisions per bunch crossing increases. To cope with these high rates in the pixel trackers, per-pixel time measurements are required, which implies the need for fast sensors. The inverse Low-Gain Avalanche Detector (iLGAD) is one of the fast sensor options that is being investigated. This paper will show the results of an inverse Low-Gain Avalanche Detector (iLGAD) with a pitch of 55 \textmu m, a thickness of 250~\textmu m …

Heute habe ich #Hüttenkäse als Salatzutat entdeckt. Dieses Rezept habe ich ausprobiert:
1 Dose Thunfisch abtropfen lassen
2 Frühlingszwiebeln hacken
200 g Tomaten würfeln
Alles mit 300 g Hüttenkäse, 2 EL geh. Petersilie und 2 EL Olivenöl mischen.
Mit 1 EL Zitronensaft, Salz und Pfeffer würzen
Na ja, wie fast immer habe ich das Rezept etwas abgewandelt …

Identity isn't everything -- how far do demographics take us towards self-identified party ID?
Sabina Tomkins, David Rothschild, Alex Liu, Alexander Thompson
https://arxiv.org/abs/2507.06193

Identity isn't everything -- how far do demographics take us towards self-identified party ID?
How well do demographics explain party identification? Demographics are related to party identification in political polls, news articles, and academic publications. Yet, there is a diversity of party identification even within demographic groups which have historically been attached to one party. And some groups lack a clear connection to either party. It may be that demographics on their own fail to account for the fact that people generally belong to a variety of groups. They must select the…

Fast X-ray Transient detection with AXIS: application to Magnetar Giant Flares
Michela Negro, Zorawar Wadiasingh, George Younes, Eric Burns, Anirudh Patel, Brian D. Metzger, Todd A. Thompson, Daryl Haggard, S. Bradley Cenko
https://arxiv.org/abs/2509.03763

Fast X-ray Transient detection with AXIS: application to Magnetar Giant Flares
Magnetar giant flares (MGFs) are among the most luminous high-energy transients in the local universe, consisting of a short, intense MeV gamma-ray spike followed by a softer, pulsating X-ray tail and possibly delayed radioactive emission. While only three Galactic events have been firmly detected, several extragalactic candidates have recently been reported, motivating the need for sensitive, rapid-response gamma- and X-ray facilities to constrain their rates and energetics. We present a feasi…

I finally had a go at doing the thing to our build system that I've been thinking about for ages. Result: proof-of-concept reduces build times by at least 20 minutes, probably more when we're done.
I now just have to get from POC to production. Uh, how hard can it be?
(timf winces)
#fast-git-clone-using-zfs-reference-repos