Tootfinder

El fin de semana fuimos a ver la nueva «The Naked Gun», con Liam Neeson como el sargento Frank Drebin Jr. y la encontré para matarse de la risa. Una muy buena comedia.
#TheNakedGun

Justified Representation: From Hare to Droop
Matthew M. Casey, Edith Elkind
https://arxiv.org/abs/2508.00811 https://arxiv.org/pdf/2508.00811

Justified Representation: From Hare to Droop
The study of proportionality in multiwinner voting with approval ballots has received much attention in recent years. Typically, proportionality is captured by variants of the Justified Representation axiom, which say that cohesive groups of at least $\ell\cdot\frac{n}{k}$ voters (where $n$ is the total number of voters and $k$ is the desired number of winners) deserve $\ell$ representatives. The quantity $\frac{n}{k}$ is known as the Hare quota in the social choice literature. Another -- more …

📢 Keine Einigung bei Stromsteuer
Übereinstimmenden Medienberichten zufolge konnte sich der schwarz-rote Koalitionsausschuss nicht auf Senkungen der Stromsteuer für Privathaushalte einigen. Es bleibe - anders als im Koalitionsvertrag geplant - bei den bisher vereinbarten Vergünstigungen für Unternehmen sowie Land- und Forstwirtschaft.
➡️

Keine Einigung bei Stromsteuer
Übereinstimmenden Medienberichten zufolge konnte sich der schwarz-rote Koalitionsausschuss nicht auf Senkungen der Stromsteuer für Privathaushalte einigen. Es bleibe - anders als im Koalitionsvertrag geplant - bei den bisher vereinbarten Vergünstigungen für Unternehmen sowie Land- und Forstwirtschaft.

Inherent momentum-dependent gap structure of altermagnetic superconductors
Christian L. H. Rasmussen, Jannik Gondolf, Mats Barkman, Merc\`e Roig, Daniel F. Agterberg, Andreas Kreisel, Brian M. Andersen
https://arxiv.org/abs/2509.03247

Inherent momentum-dependent gap structure of altermagnetic superconductors
Altermagnetic metals break time-reversal symmetry and feature spin-split Fermi surfaces generated by compensated Néel-ordered collinear magnetic moments. Being metallic, such altermagnets may undergo a further instability at low temperatures to a superconducting state, and it is an interesting open question what are the salient features of such altermagnetic superconductors? We address this question on the basis of realistic microscopic models that capture the altermagnetic sublattice degrees …

Optical spectroscopic signatures of the red giant evolutionary state
Ella Xi Wang, Melissa Ness, Thomas Nordlander, Andrew R. Casey, Sarah Martell, Marc Pinsonneault, Xiaoting Fu, Dennis Stello, Claudia Reyes, Marc Hon, Madeleine McKenzie, Mingjie Jian, Jie Yu, Sven Buder, Karin Lind, Joss Bland-Hawthorn, Daniel B. Zucker, Pradosh Barun Das, Richard de Grijs, Michael Hayden

Optical spectroscopic signatures of the red giant evolutionary state
Modern spectroscopic surveys output large data volumes. Theoretical models provide a means to transform the information encoded in these data to measurements of physical stellar properties. However, in detail the models are incomplete and simplified, and prohibit interpretation of the fine details in spectra. Instead, the available data provide an opportunity to use data-driven, differential analysis techniques, as a means towards understanding spectral signatures. We deploy such an analysis to…

Polynomials associated to Lie algebras
Mat\'ias Bruna, Alex Capu\~nay, Eduardo Friedman
https://arxiv.org/abs/2507.00326 https://…

Polynomials associated to Lie algebras
We associate to a semisimple complex Lie algebra $\mathfrak{g}$ a sequence of polynomials $P_{\ell,\mathfrak{g}}(x)\in\mathbb{Q}[x]$ in $r$ variables, where $r$ is the rank of $\mathfrak{g}$ and $\ell=0,1,2,\ldots $. The polynomials $P_{\ell,\mathfrak{g}}(x)$ are uniquely associated to the isomorphism class of $\mathfrak{g}$, up to re-numbering the variables, and are defined as special values of a variant of Witten's zeta function. Another set of polynomials associated to $\mathfrak{g}$ were de…

On the Benefits of Accelerated Optimization in Robust and Private Estimation
Laurentiu Andrei Marchis, Po-Ling Loh
https://arxiv.org/abs/2506.03044 https:/…

On the Benefits of Accelerated Optimization in Robust and Private Estimation
We study the advantages of accelerated gradient methods, specifically based on the Frank-Wolfe method and projected gradient descent, for privacy and heavy-tailed robustness. Our approaches are as follows: For the Frank-Wolfe method, our technique is based on a tailored learning rate and a uniform lower bound on the gradient of the $\ell_2$-norm over the constraint set. For accelerating projected gradient descent, we use the popular variant based on Nesterov's momentum, and we optimize our obje…

Searching for Di-Higgs Signatures of Light Charged Scalars
Guglielmo Coloretti, Andreas Crivellin, Syuhei Iguro
https://arxiv.org/abs/2507.00121 https://…

Searching for Di-Higgs Signatures of Light Charged Scalars
The excess in $t\to b\overline{b}c$ observed by ATLAS points towards a charged Higgs boson with a mass around 130$\,$GeV, consistent with the expectations from the $B$ anomalies, i.e.$~R_{D^{(*)}}$ and $b\to s\ell^+\ell^-$ data. As a non-minimal flavour structure is required for an explanation of these observables, this points towards a two-Higgs-doublet model with generic Yukawa couplings. Such a scenario predicts a sizable cross section for the pair production of the charged Higgs at the Larg…

Geometric Gaussian Approximations of Probability Distributions
Natha\"el Da Costa, B\'alint Mucs\'anyi, Philipp Hennig
https://arxiv.org/abs/2507.00616

Geometric Gaussian Approximations of Probability Distributions
Approximating complex probability distributions, such as Bayesian posterior distributions, is of central interest in many applications. We study the expressivity of geometric Gaussian approximations. These consist of approximations by Gaussian pushforwards through diffeomorphisms or Riemannian exponential maps. We first review these two different kinds of geometric Gaussian approximations. Then we explore their relationship to one another. We further provide a constructive proof that such geome…

The FTC Warns Big Tech Companies Not to Apply the Digital Services Act
FTC chairman Andrew Ferguson wrote a scathing letter to companies including Google, Meta, and Apple, telling them not to apply the DSA if it jeopardizes the freedom of Americans.
https://www.

Big Tech Companies in the US Have Been Told Not to Apply the Digital Services Act
The FTC notified companies like Google, Meta, and Apple that they must not apply the Digital Services Act, which regulates digital platforms, if it jeopardizes the freedom of Americans.