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Periodicity of point processes in abelian groups without lattices
Nachi Avraham-Re'em, Michael Bj\"orklund, Rickard Cullman
https://arxiv.org/abs/2509.20847 https://

Periodicity of point processes in abelian groups without lattices
We investigate the intersection covolume of cross sections for probability preserving actions of a class of abelian groups without lattices, including $p$-adic groups and the group of finite adeles. We show that for cross sections with a uniformly discrete return time set, the intersection covolume is bounded below by twice the intensity, revealing a strict gap compared to the lattice case. Our main theorem asserts that cut-and-project systems uniquely attain the minimal intersection covolume. …

Roadmap: Emerging Platforms and Applications of Optical Frequency Combs and Dissipative Solitons
Dmitry Skryabin, Arne Kordts, Richard Zeltner, Ronald Holzwarth, Victor Torres-Company, Tobias Herr, Fuchuan Lei, Qi-Fan Yang, Camille-Sophie Br\`es, John F. Donegan, Hai-Zhong Weng, Delphine Marris-Morini, Adel Bousseksou, Markku Vainio, Thomas Bunel, Matteo Conforti, Arnaud Mussot, Erwan Lucas, Julien Fatome, Yuk Shan Cheng, Derryck T. Reid, Alessia Pasquazi, Marco Peccianti, M. Giudici, M. Marconi, A. Bartolo, N. Vigne, B. Chomet, A. Garnache, G. Beaudoin, I. Sagnes, Richard Burguete, Sarah Hammer, Jonathan Silver
https://arxiv.org/abs/2511.18231 https://arxiv.org/pdf/2511.18231 https://arxiv.org/html/2511.18231
arXiv:2511.18231v1 Announce Type: new
Abstract: The discovery of optical frequency combs (OFCs) has revolutionised science and technology by bridging electronics and photonics, driving major advances in precision measurements, atomic clocks, spectroscopy, telecommunications, and astronomy. However, current OFC systems still require further development to enable broader adoption in fields such as communication, aerospace, defence, and healthcare. There is a growing need for compact, portable OFCs that deliver high output power, robust self-referencing, and application-specific spectral coverage. On the conceptual side, progress toward such systems is hindered by an incomplete understanding of the fundamental principles governing OFC generation in emerging devices and materials, as well as evolving insights into the interplay between soliton and mode-locking effects. This roadmap presents the vision of a diverse group of academic and industry researchers and educators from Europe, along with their collaborators, on the current status and future directions of OFC science. It highlights a multidisciplinary approach that integrates novel physics, engineering innovation, and advanced researcher training. Topics include advances in soliton science as it relates to OFCs, the extension of OFC spectra into the visible and mid-infrared ranges, metrology applications and noise performance of integrated OFC sources, new fibre-based OFC modules, OFC lasers and OFC applications in astronomy.
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The Solar System School is now permanent! 🥳🥳
The unique graduate program offers students from all over the world the opportunity to obtain a doctorate in solar system research. 🛰️☀️🔭
Joint PR @…

Yesterday was my last day of this term's teaching Communication at the School of Engineering. So time to say good by to the little fellow living in TH547 and attending all lectures! He was there even on days none of the 33 students showed up
#AcademicChatter #TeachingElephant

The International Max Planck Research School for Solar System Science becomes a permanent institution in Göttingen and Braunschweig
The Solar System School, the joint graduate school of the Max Planck Institute for Solar System Research, the University of Göttingen, and the Technical University of Braunschweig, is now a permanent fixture in doctoral training in Göttingen and Braunschweig. The Max Planck Society will continue the International Max Planck Research School for Solar Syste…

I feel as though I should illustrate the difference that this one single constraint can make by two examples.
The rules of Simon Says are maximally authoritarian. You must perform any action ordered, with the only restriction that the authority must say "Simon says" first. Were you forced to stay in this system, it would be the most despotic autocracy possible. But it's not. It's a silly game because you can leave at any time.
Let's flip this and imagine a room. During a specific period of time you will have absolute control over everything in this room. In this room you have total freedom. This is not even the limited freedom, the coordinated freedom, the compromising freedom of civil society. You could, without consequence, perform any action you wish in this room. You could say anything, destroy or steal any object, order any individual to perform any action, kill any person in the room with you and take anything they own. This is the sovereign freedom, the absolute freedom, of dictators and kings. The only restriction is that you are not allowed to leave the room while you have this freedom. In fact, you really only have this level of freedom because the room is actually empty other than for you. I am, of course, talking about a form of torture still common in the US: solitary confinement.

Robust autobidding for noisy conversion prediction models
Andrey Pudovikov, Alexandra Khirianova, Ekaterina Solodneva, Gleb Molodtsov, Aleksandr Katrutsa, Yuriy Dorn, Egor Samosvat
https://arxiv.org/abs/2510.08788

Robust autobidding for noisy conversion prediction models
Managing millions of digital auctions is an essential task for modern advertising auction systems. The main approach to managing digital auctions is an autobidding approach, which depends on the Click-Through Rate and Conversion Rate values. While these quantities are estimated with ML models, their prediction uncertainty directly impacts advertisers' revenue and bidding strategies. To address this issue, we propose RobustBid, an efficient method for robust autobidding taking into account uncer…

"Getting Hired to Work on FOSS - The Do-s, Don't-s and Pitfalls for Everyone Involved" is what my friend Till Adam talked about at #Akademy2025. He also has a short section on why Free Software is worth more compared to proprietary software, so you should take higher rates and principals should be willing to pay more. And he draws from experience of contracts that

I feel as though I should illustrate the difference that this one single constraint can make by two examples.
The rules of Simon Says are maximally authoritarian. You must perform any action ordered, with the only restriction that the authority must say "Simon says" first. Were you forced to stay in this system, it would be the most despotic autocracy possible. But it's not. It's a silly game because you can leave at any time.
Let's flip this and imagine a room. During a specific period of time you will have absolute control over everything in this room. In this room you have total freedom. This is not even the limited freedom, the coordinated freedom, the compromising freedom of civil society. You could, without consequence, perform any action you wish in this room. You could say anything, destroy or steal any object, order any individual to perform any action, kill any person in the room with you and take anything they own. This is the sovereign freedom, the absolute freedom, of dictators and kings. The only restriction is that you are not allowed to leave the room while you have this freedom. In fact, you really only have this level of freedom because the room is actually empty other than for you. I am, of course, talking about a form of torture still common in the US: solitary confinement.