Tootfinder

Nippon Steel’s $14.9bn acquisition of US Steel closed on Wednesday,
confirming an unusual degree of power for the Trump administration after the Japanese company’s 18-month struggle to close the purchase.
Under the deal terms, Nippon bought 100% of US Steel shares at $55 a share, as it first laid out in its December 2023 offer for the well-known and struggling steelmaker.
A press release on the filing also discloses details of a national security agreement inked with the Tr…

Evaluation of Modular Polynomials from Supersingular Elliptic Curves
Maria Corte-Real Santos, Jonathan Komada Eriksen, Antonin Leroux, Michael Meyer, Lorenz Panny
https://arxiv.org/abs/2506.15429

Evaluation of Modular Polynomials from Supersingular Elliptic Curves
We present several new algorithms to evaluate modular polynomials of level $\ell$ modulo a prime $p$ on an input $j$. More precisely, we introduce two new generic algorithms, sharing the following similarities: they are based on a CRT approach; they make use of supersingular curves and the Deuring correspondence; and, their memory requirements are optimal. The first algorithm combines the ideas behind a hybrid algorithm of Sutherland in 2013 with a recent algorithm to compute modular polyno…

Happy #AutisticPrideDay! ♾️💙
I’m proudly autistic, my brain works in its own unique way, full of different thoughts and feelings all at once. Being autistic is part of who I am, not something to fix. 🧠🧠
I’m also queer and genderfluid, and that’s just another part of my colorful identity. Some days I feel one way, some days another, and that’s okay. 🏳️‍🌈☂️
Neurodiver…

The European Commission accuses Chinese marketplace AliExpress of failing to tackle illegal products on its platform, in preliminary findings under the DSA (Gian Volpicelli/Bloomberg)
https://www.bloomberg.com/news/articles/20

Identification of $D^*_2(3000)$ as the $D_2^*(2^3P_2)$ and exploring potential of undiscovered $2^ $ mesons via $B$ decays
Shi-Hang Zhang, Wen-Yuan Ke, Su-Yan Pei, Wei Li, Xiao-Ze Tan, Lili Zhu, Guo-Li Wang
https://arxiv.org/abs/2506.14140

Identification of $D^*_2(3000)$ as the $D_2^*(2^3P_2)$ and exploring potential of undiscovered $2^+$ mesons via $B$ decays
Following the discovery of the $D^*_2(3000)$, its mass and full width have been extensively studied. Yet its nature remains undetermined to date. Since it was discovered through nonleptonic decay of $B$ meson and the corresponding cascade process, we therefore in this paper investigate the nonleptonic and semileptonic decays of $B$ meson to $J^P = 2^+$ charmed mesons using the Bethe-Salpeter equation approach. Our calculations on nonleptonic $B$ decays reveal that the unconfirmed resonance $D^*…

Strain-tuning for superconductivity in La$_3$Ni$_2$O$_7$ thin films
Motoki Osada, Chieko Terakura, Akiko Kikkawa, Masamichi Nakajima, Hsiao-Yi Chen, Yusuke Nomura, Yoshinori Tokura, Atsushi Tsukazaki
https://arxiv.org/abs/2506.15319

Strain-tuning for superconductivity in La$_3$Ni$_2$O$_7$ thin films
The recent discovery of high-transition temperature ($T_\mathrm{c}$) superconductivity in pressurized La$_{3}$Ni$_{2}$O$_{7}$ bulk crystals has attracted keen attention due to its characteristic energy diagram of $e_{g}$ orbitals, containing nearly half-filled $d_{3z^2 - r^2}$ and quarter-filled $d_{x^2 - y^2}$ orbitals. This finding provides valuable insights into the orbital contributions and interlayer interactions in double NiO$_{6}$ octahedra, offering opportunities to control the electron…

An illustration of formal moduli problems with differential graded Lie algebras
Ethan Eugene Wynner
https://arxiv.org/abs/2506.12977 https://

An illustration of formal moduli problems with differential graded Lie algebras
This article provides an exposition to the topic of formal moduli problems, emphasizing its connections with differential graded Lie algebras, and mainly following from Jacob Lurie's DAG X: Formal Moduli Problems. As such, this paper should not be viewed as a presentation of original work, but rather a concise introduction to the subject in the form of a set of organized notes. I hoped to make this paper feel welcoming and insightful for the non-expert enjoyer of derived algebraic geometry, lik…

Modeling flying formations as flow-mediated matter
Christiana Mavroyiakoumou, Jiajie Wu, Leif Ristroph
https://arxiv.org/abs/2506.14025 https://

Modeling flying formations as flow-mediated matter
Collective locomotion of swimming and flying animals is fascinating in terms of individual-level fluid mechanics and group-level structure and dynamics. Here we bridge and relate these scales through a model of formation flight that views the collective as a material whose properties arise from the flow-mediated interactions among its members. We build on and revise an aerodynamic model describing how flapping flyers produce vortex wakes and how they are forced by others' wakes. While simplisti…

Amazon reorganizes its healthcare business into six "pillars" to simplify its structure, following executive departures and its struggles in the market (CNBC)
https://www.cnbc.com/2025/06/13/amazon-reorganizes-i…

Amazon reorganizes health-care business in latest bid to crack multitrillion-dollar market
Amazon is reorganizing its health-care business into six "pillars" to simplify its structure in a market where it's spent billions of dollars on acquisitions.

Filings: Bengaluru-based fintech Cred, which offers rewards for paying credit card bills and more, raised ~$72M at a $3.5B valuation, down from $6.4B in 2022 (The Economic Times)
https://ec…

Cred raises fresh funds from GIC, others; valuation cut by 45% to $3.5 billion
The fintech major was valued at $6.4 billion in 2022 during its last major fund infusion. The current fund infusion is in the form of primary capital, which means that existing investors have not sold any shares in this round. The drop in valuation was in line with the company's plans to list in India over the next two years, people in the know said.