Tootfinder

The General Expiration Streaming Model: Diameter, $k$-Center, Counting, Sampling, and Friends
Lotte Blank, Sergio Cabello, MohammadTaghi Hajiaghayi, Robert Krauthgamer, Sepideh Mahabadi, Andr\'e Nusser, Jeff M. Phillips, Jonas Sauer
https://arxiv.org/abs/2509.07587

The General Expiration Streaming Model: Diameter, $k$-Center, Counting, Sampling, and Friends
An important thread in the study of data-stream algorithms focuses on settings where stream items are active only for a limited time. We introduce a new expiration model, where each item arrives with its own expiration time. The special case where items expire in the order that they arrive, which we call consistent expirations, contains the classical sliding-window model of Datar, Gionis, Indyk, and Motwani [SICOMP 2002] and its timestamp-based variant of Braverman and Ostrovsky [FOCS 2007]. …

Sources: Oaktree, EQT, DWS, and other private capital groups are seeking to cash in on the US-driven AI boom, launching €17B of European data center sales (Financial Times)
https://www.ft.com/content/48a39d2c-f5ac-470e-b2ac-93cdc5eb4be7

Slice Emittance Preservation and Focus Control in a Passive Plasma Lens
J. Bj\"orklund Svensson, J. Beinortait\.e, L. Boulton, B. Foster, J. M. Garland, P. Gonz\'alez Caminal, M. Huck, H. Jones, A. Kanekar, G. Loisch, J. Osterhoff, F. Pe\~na, S. Schr\"oder, M. Th\'evenet, S. Wesch, M. Wing, J. C. Wood, R. D'Arcy
https://

Slice Emittance Preservation and Focus Control in a Passive Plasma Lens
Strong, symmetrically focusing plasma lenses are promising for accommodating the small beams associated with plasma-based accelerators and collider final foci. However, while focusing with active and passive plasma lenses has been experimentally demonstrated, compatibility with high-brightness beams relevant for applications has not. In this Letter, we show experimentally that passive plasma lenses can preserve free-electron-laser-quality slice emittance while focusing two orders of magnitude m…

Low-Power Optimal Strategy for Witsenhausen Counterexample
Mengyuan Zhao, Ma\"el Le Treust, Tobias J. Oechtering
https://arxiv.org/abs/2509.02381 https://

Low-Power Optimal Strategy for Witsenhausen Counterexample
We discuss the Witsenhausen counterexample from the perspective of varying power budgets and propose a low-power estimation (LoPE) strategy. Specifically, our LoPE approach designs the first decision-maker (DM) a quantization step function of the Gaussian source state, making the target system state a piecewise linear function of the source with slope one. This approach contrasts with Witsenhausen's original two-point strategy, which instead designs the system state itself to be a binary step. …

Ostras, leía un titular esta mañana que decía algo parecido a "La victoria de bluesky sobre X y facebook es una batalla ganada contra el algoritmo" y aún me duele la cara del facepalm que me he hecho.

On the threshold behaviour of heavy top production
Torbj\"orn Sj\"ostrand
https://arxiv.org/abs/2510.04590 https://arxiv.org/pdf/2510.04590

On the threshold behaviour of heavy top production
The observation of an excess of ttbar production in the threshold region, by CMS and ATLAS, has been interpreted as a toponium contribution, i.e. from below-threshold ttbar virtual states. The news here is the nontrivial experimental extraction of such a signal, not its existence as such. Indeed, already 35+ years ago an NRQCD Green's function approach was used to model the above- and below-threshold production of ttbar pairs in pp/ppbar collisions. The relevant cross section equations from tha…