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Großer Datendiebstahl bei US-Tochter der Allianz Versicherung
Die US-Lebensversicherung Allianz Life bestätigte einen Cyberangriff auf eine Datenbank mit persönlichen Daten der meisten Kunden.
https://www.…

Nonrational varieties with unirational parametrizations of coprime degrees
Song Yang, Xun Yu, Zigang Zhu
https://arxiv.org/abs/2508.03623 https://arxiv.org…

Nonrational varieties with unirational parametrizations of coprime degrees
We show that there exists a $2$-dimensional family of smooth cubic threefolds admitting unirational parametrizations of coprime degrees. This together with Clemens--Griffiths' work solves the long standing open problem whether there exists a nonrational variety with unirational parametrizations of coprime degrees. Our proof uses a new approach, called the Noether--Cremona method, for determining the rationality of quotients of hypersurfaces.

Bei der US-Tochter von #Allianz wurden durch einen #Cyberangriff Mitte Juli 2025 personenbezogene Daten von Kunden, Beratern und Mitarbeitenden kompromittiert.
Betroffen sein könnten über eine Million Versicherte. Der Zugriff erfolgte über ein Drittanbietersystem mittels

Lebensversicherung: Allianz Life - Hacker stehlen Daten der meisten Kunden - Golem.de
Die US-Tochter der Allianz bestätigt einen Cyberangriff auf ihre Kundendatenbank. Über eine Million Versicherte könnten betroffen sein.

On the Irreducibility of the Cuboid Polynomial $P_{a,u}(t)$
Valery Asiryan
https://arxiv.org/abs/2510.07643 https://arxiv.org/pdf/2510.07643

On the Irreducibility of the Cuboid Polynomial $P_{a,u}(t)$
In this paper we consider the even monic degree-8 cuboid polynomial $P_{a,u}(t)$ with coprime integers $a\neq u>0$. We prove irreducibility over $\mathbb{Z}$ by excluding all degree-8 splittings. First, any putative $4{+}4$ factorization is shown to force a specific Diophantine constraint that has no integer solutions, via a short $2$- and $3$-adic analysis. Second, we exclude every $2{+}6$ factorization using an exact divisor criterion together with a discriminant obstruction. Finally, after r…

Einige der zuletzt hier besonders häufig geteilten #News:
Großer Datendiebstahl bei US-Tochter der Allianz Versicherung

Me gusta lo rockero e improvisado a ratos que suena este šlbum de Neil Young. Fue lanzado el año que yo nací. Es viejito ya 😅
«re-ac-tor»
(Es parte de colección digital)
#NeilYoung #NeilYoungAndCrazyHorse #Musica

Better Together: Cross and Joint Covariances Enhance Signal Detectability in Undersampled Data
Arabind Swain, Sean Alexander Ridout, Ilya Nemenman
https://arxiv.org/abs/2507.22207

Better Together: Cross and Joint Covariances Enhance Signal Detectability in Undersampled Data
Many data-science applications involve detecting a shared signal between two high-dimensional variables. Using random matrix theory methods, we determine when such signal can be detected and reconstructed from sample correlations, despite the background of sampling noise induced correlations. We consider three different covariance matrices constructed from two high-dimensional variables: their individual self covariance, their cross covariance, and the self covariance of the concatenated (joint…

Perturbations of Plane Waves and Quadratic Quasinormal Modes on the Lightring
Kwinten Fransen, David Pere\~niguez, Jaime Redondo-Yuste
https://arxiv.org/abs/2509.03598 https://

Perturbations of Plane Waves and Quadratic Quasinormal Modes on the Lightring
We study second order gravitational perturbations on plane wave spacetimes from both the metric and curvature perturbation points of view. For the former, we explicitly use the isometries of the background to introduce tensor oscillator harmonics, which render Einstein's equations algebraic around symmetric plane waves. For the latter, we formulate the first and second order Teukolsky equations in a Geroch-Held-Penrose covariant way. Both approaches are useful in their own right, and together w…

Scalar Amplitudes from Fibre Bundle Geometry
Mohammad Alminawi, Ilaria Brivio, Joe Davighi
https://arxiv.org/abs/2509.20482 https://arxiv.org/pdf/2509.2048…

Scalar Amplitudes from Fibre Bundle Geometry
We compute tree-level $n$-point scattering amplitudes in scalar field theories in terms of geometric invariants on a fibre bundle. All 0- and 2-derivative interactions are incorporated into a metric on this bundle. The on-shell amplitudes can be efficiently pieced together from covariant Feynman rules, and we present a general closed formula for obtaining the $n$-point amplitude in this way. The covariant Feynman rules themselves can be derived using a generalization of the normal coordinate ex…

Eatman: 1 second from a win, feels more like a loss https://www.dallascowboys.com/news/eatman-1-second-from-a-win-feels-more-like-a-loss