Tootfinder

Multivariate CLT for L\'evy processes: convergence rates without moment assumptions
Jorge Gonz\'alez C\'azares, David Kramer-Bang, Aleksandar Mijatovi\'c
https://arxiv.org/abs/2510.06891

Multivariate CLT for Lévy processes: convergence rates without moment assumptions
We prove that the norm of a $d$-dimensional Lévy process possesses a finite second moment if and only if the convex distance between an appropriately rescaled process at time $t$ and a standard Gaussian vector is integrable in time with respect to the scale-invariant measure $t^{-1} dt$ on $[1,\infty)$. We further prove that under the standard $\sqrt{t}$-scaling, the corresponding convex distance is integrable if and only if the norm of the Lévy process has a finite $(2+\log)$-moment. Both eq…

Here are some key takeaways from implementing #PyPI attestations in #Gentoo:
• With OpenPGP, you need to validate the authenticity of a key. With attestations, you need to validate the authenticity of the identity (i.e. know the right GitHub repository). No problem really solved here.
• They verify that the artifact was created by the Continuous Deployment workflow of a given repository. A compromised workflow can produce valid attestations.
• They don't provide sufficient protection against PyPI being compromised. You can't e.g. detect whether new releases weren't hidden.
On the plus side, TOFU is easier here: we don't have to maintain hundreds of key packages, just short URLs on top of ebuilds.
Security-wise, I think PEP 740 itself summarizes it well in the "rationale and motivation" section. To paraphrase, maintainers wanted to create some signatures, and downstreams wanted to verify some signatures, so we gave them some signatures.
#security #Python

Short-Pulse High-Power THz Generation Using Optical Klystron FELs: Simulation Results
Najmeh Mirian
https://arxiv.org/abs/2510.05842 https://arxiv.org/pdf/…

Short-Pulse High-Power THz Generation Using Optical Klystron FELs: Simulation Results
We investigate the feasibility of extending the optical klystron (OK) concept into the terahertz (THz) regime, where strong radiation slippage and diffraction fundamentally challenge efficient free- electron laser (FEL) operation. Numerical simulations were carried out for resonant wavelengths of 10, 30, and 100 μm using parameters relevant to the planned DALI facility. The results show that while long wavelengths exhibit rapid energy growth, they suffer from significant temporal broadening du…

Disney sues Sling TV for allegedly violating their carriage deal by including Disney's networks without permission in the new mini-bundles launched in August (Dade Hayes/Deadline)
https://deadline.com/2025/08/disney-sues-sling-tv-min…

Disney Sues Sling TV, Saying Its New Mini-Bundles Violate Carriage Deal Terms
The Walt Disney Co. is suing Dish Network's internet subsidiary Sling TV, alleging that the pay-TV service included its networks without permission in a new set of short-term pay-TV packages.

A century of the Bose-Einstein condensation concept and half a century of the JINR experiments for observation of condensate in the superfluid 4He (He II)
Valentin Zagrebnov (I2M)
https://arxiv.org/abs/2510.03378

A century of the Bose-Einstein condensation concept and half a century of the JINR experiments for observation of condensate in the superfluid 4He (He II)
This short review is devoted to celebration of two major events in quantum physics. The first one is the birth of the concept of Bose-Einstein condensation (1925) and the second is the experimental proof that it does exist and appears in the liquid 4He simultaneously with superfluidity below the $λ$-point (1975). The both of these events are tightly related to the Bogoliubov theory of superfluidity (1947). The existence of condensate in the system of interacting bosons is the key ansatz of thi…

Collective communication in a transparent world: Phase transitions in a many-body Potts model and social-quantum duality
Pawat Akarapipattana, Sergei Nechaev, Bogdan Slavov
https://arxiv.org/abs/2508.20267

Collective communication in a transparent world: Phase transitions in a many-body Potts model and social-quantum duality
We consider the Schelling-like social competition reflected in "dynamics of opinions" among groups of agents ("communities") in a highly transparent world. Specifically, we investigate a $q$-state Potts spin system with competing two- and three-body interactions on a complete graph. Agents interact through pairwise repulsion (opposing opinions) between different communities and three-body attraction (shared opinions) within the same community. In the thermodynamic limit, we identify variants of…

I've probably mentioned that I'm working on switching #Gentoo from our half-broken eselect-ldso logic to #FlexiBLAS. This also involves a transition period where both setups would be supported.
A good thing is that the switch is ABI-compatible with the previous state (or at least it's supposed to be — we're working with upstream on fixing function coverage). Since libblas.so, liblapack.so and the rest are replaced by symlinks, programs that link to them will simply start using FlexiBLAS. So far, so good.
Unfortunately, switching the other way doesn't work as well. Stuff newly built against our libblas.so & co. symlinks naturally reads FlexiBLAS's SONAME from them, and links to libflexiblas directly. So should you decide to switch back, some packages will stay linked to FlexiBLAS and will need to rebuilt.
In order to avoid this, I would have to replace the symlinks with wrapper libraries, having libblas.so.3 and so on SONAMEs, and linking to libflexiblas. Unfortunately, a dummy wrapper isn't going to work — the linker will complain about using indirect symbols from libflexiblas.so. So I would probably have to "reexport" their symbols somehow, and ideally split into appropriate libraries, so that `-Wl,--as-needed` wouldn't drop some of them. But how to do that?
Well, let's look at the existing logic for eselect-ldso — clearly both BLIS and OpenBLAS create some wrappers. So I've spent some time investigating upstream Makefiles, and literally couldn't find the respective targets. I mean, these are quite complex Makefiles, but I'm grepping hard and can't find even a partial match.
As it turns out, these Makefile targets are added by Gentoo-specific patches. And these patches are just horrible. In case of OpenBLAS, they create the wrapper libraries by linking all the relevant .o files from OpenBLAS build, plus the shared OpenBLAS library. So the OpenBLAS symbols relevant to each interface end up duplicated in libblas.so, liblapack.so, etc., and apparently the symbols needed by them are taken from libopenblas.so. The individual interface libraries aren't even linked to one another, so they expose their own duplicate symbols, but use the implementation from OpenBLAS instead.
BLIS is even worse — the patch is simply creating libblas.so and libcblas.so, using all BLIS objects directly, plus symbol visibility to hide symbols irrelevant to the library. So yes, libblis.so, libblas.so and libcblas.so are roughly three separate copies of the same library, differing only in symbol visibility. And of course libcblas.so doesn't use libblas.so.
Truly #GSoC quality.

Toward Automated Hypervisor Scenario Generation Based on VM Workload Profiling for Resource-Constrained Environments
Hyunwoo Kim, Jaeseong Lee, Sunpyo Hong, Changmin Han
https://arxiv.org/abs/2508.08952

Toward Automated Hypervisor Scenario Generation Based on VM Workload Profiling for Resource-Constrained Environments
In the automotive industry, the rise of software-defined vehicles (SDVs) has driven a shift toward virtualization-based architectures that consolidate diverse automotive workloads on a shared hardware platform. To support this evolution, chipset vendors provide board support packages (BSPs), hypervisor setups, and resource allocation guidelines. However, adapting these static configurations to varying system requirements and workloads remain a significant challenge for Tier 1 integr…

The Economic Complexity of the Roman Empire
Matteo Mazzamurro, Petra Hermankova, Michele Coscia, Tom Brughmans
https://arxiv.org/abs/2508.19892 https://arx…

The Economic Complexity of the Roman Empire
Economic complexity is a powerful tool to estimate the productive capabilities and future growth of modern economies. Little is known of how economic complexity evolves over long periods in history. In this paper, we use archaeological evidence from the Roman Empire in the form of short texts preserved on a durable material (i.e. inscriptions) to estimate the economic complexity of the various provinces of the empire. By connecting the occupations listed in the text of inscriptions with the loc…

Most Western African migrants remain local and travel short distances
Irene Tafani, Ola Ali, Rafael Prieto-Curiel, Massimo Riccaboni
https://arxiv.org/abs/2509.10314 https://

Most Western African migrants remain local and travel short distances
Migration patterns are complex and context-dependent, with the distances migrants travel varying greatly depending on socio-economic and demographic factors. While global migration studies often focus on Western countries, there is a crucial gap in our understanding of migration dynamics within the African continent, particularly in West Africa. Using data from over 60,000 individuals from eight West African countries, this study examines the determinants of migration distance in the region. Ou…