Tootfinder

Metallic species in interstellar medium: Astrochemical modeling
Ankan Das, Milan Sil, Paola Caselli
https://arxiv.org/abs/2506.19463 https://

Metallic species in interstellar medium: Astrochemical modeling
Metal-bearing species in diffuse or molecular clouds are often overlooked in astrochemical modeling except for the charge exchange process. However, catalytic cycles involving these metals can affect the abundance of other compounds. We prepared a comprehensive chemical network for Na, Mg, Al, Fe, K, and Si-containing species. Assuming water as the major constituent of interstellar ice in dark clouds, quantum chemical calculations were carried out to estimate the binding energy of important met…

Block Tensor Decomposition: A dual grid scheme with formal O(N3) for THC decomposition of molecular systems
Yueyang Zhang, Xuewei Xiong, Wei Wu, Peifeng Su
https://arxiv.org/abs/2506.19392

Block Tensor Decomposition: A dual grid scheme with formal O(N3) for THC decomposition of molecular systems
Accurate and fast treatment of electron-electron interactions remains a central challenge in electronic structure theory because post-Hartree-Fock methods often suffered from the computational cost for 4-index electron repulsion integrals (ERIs). Low-rank approaches such as tensor hyper-contraction (THC) and interpolative separable density fitting (ISDF) have been proposed for Hartree-Fock exchange and correlation's calculations. Their application to molecular systems remains inefficient due to…

The Theory of Economic Complexity
C\'esar A. Hidalgo, Viktor Stojkoski
https://arxiv.org/abs/2506.18829 https://arxiv.org/pdf/250…

The Theory of Economic Complexity
Economic complexity estimates rely on eigenvectors derived from matrices of specialization to explain differences in economic growth, inequality, and sustainability. Yet, despite their widespread use, we still lack a principled theory that can deduce these eigenvectors from first principles and place them in the context of a mechanistic model. Here, we calculate these eigenvectors analytically for a model where the output of an economy in an activity increases with the probability the economy i…

Differential operators on Hermitian modular forms on $\mathrm{u}(n, n)$
Nobuki Takeda
https://arxiv.org/abs/2506.18236 https://arxiv.…

Differential operators on Hermitian modular forms on $\mathrm{u}(n, n)$
We construct explicit differential operators on hermitian modular forms, extending methods developed for Siegel modular forms. These differential operators are closely related to the two-variable spherical pluriharmonic polynomials. We construct explicit bases for the space of such polynomials and use them to build concrete operators. As an application, we derive an exact pullback formula for hermitian Eisenstein series.

With the first #AAS246 presser "Cosmic Accelerators and Active Black Holes" came the papers https://iopscience.iop.org/article/10.3847/1538-4357/adb7e0 (Discovery of a Pulsar Wind Nebula Candidate Associated with the Galactic PeVatron 1LHAASO J0343 5254u) &
https://iopscience.iop.org/article/10.3847/2515-5172/adccb9 (Swift-XRT Observations and Upper Limits at Five LHAASO Galactic Sources) with the press release https://natsci.msu.edu/news/2025/2025-06-where-did-cosmic-rays-come-from.aspx, https://iopscience.iop.org/article/10.3847/1538-4357/adccc1 (Radial Profiles of Radio Halos in Massive Galaxy Clusters: Diffuse Giants Over 2 Mpc) etc. with the press release https://www.cfa.harvard.edu/news/record-breaking-cosmic-structure-discovered-colossal-galaxy-cluster and https://arxiv.org/abs/2504.09676 (Investigating the Emission Mechanism in the Spatially Resolved Jets of Two z ≈ 3 Radio-loud Quasars) with the press releases https://chandra.si.edu/photo/2025/j1610/ and https://www.nasa.gov/image-article/nasas-chandra-sees-surprisingly-strong-black-hole-jet-at-cosmic-noon/ and the abstract https://ui.adsabs.harvard.edu/abs/2025AAS...24520421S/abstract (NIRCam imaging of NGC 4258).

Under a new cybersecurity blueprint, the European Union will work more closely with national militaries and the NATO defense alliance to respond to large-scale cyberattacks.
https://www.politico.eu/article/europe-arms-cyber-council-military-c…

Europe arms itself against cyber catastrophe
EU to train with militaries, industry and NATO to better fend off large-scale cyberattacks.

This https://arxiv.org/abs/2411.17877 has been replaced.
initial toot: https://mastoxiv.page/@…

Chiral eigenbases of the XX and XY quantum spin chains
We calculate the values of observables in chiral eigenstates of the XX quantum spin chain that were introduced in previous work and compare the form of the result with the respective expressions obtained in the more familiar eigenbasis of states with fixed magnetization in the $z$ direction. We carry out the diagonalization of the XY spin chain in the chiral basis. We calculate the norm of the chiral XY eigenstates, and the values of the one-point functions and some neighbor two-point correlati…

Magnetic excitations and exchange parameters of a nickel chain compound PbMn$_2$Ni$_6$Te$_3$O$_{18}$: Neutron scattering and density functional theory studies
S. Uthayakumar, D. T. Adroja, Amit Pokhriyal, A. K. Bera, Haranath Ghosh, Tatiana Gudi, Manh Duc Le, Christian Balz, R. A. Ewings, Minal Gupta, P. R. Sagdeo, D. Prabhakaran, J. P. Goff
https://…

Magnetic excitations and exchange parameters of a nickel chain compound PbMn$_2$Ni$_6$Te$_3$O$_{18}$: Neutron scattering and density functional theory studies
We have investigated the quasi-one dimensional Ni-chain compound PbMn$_2$Ni$_6$Te$_2$O$_{18}$ using theoretical DFT calculations, inelastic neutron scattering and optical spectroscopy in order to understand the nature of magnetic exchange interactions. Our inelastic neutron scattering study at 5 K on a powder sample reveals two bands of magnetic excitations, the first near 8 meV and the second near 18 meV originating from the antiferromagnetic zone center near $Q$ = 1~Å. On the other hand at 1…

Power Enhancement of Permutation-Augmented Partial-Correlation Tests via Fixed-Row Permutations
Tianyi Wang, Guanghui Wang, Zhaojun Wang, Changliang Zou
https://arxiv.org/abs/2506.02906

Power Enhancement of Permutation-Augmented Partial-Correlation Tests via Fixed-Row Permutations
Permutation-based partial-correlation tests guarantee finite-sample Type I error control under any fixed design and exchangeable noise, yet their power can collapse when the permutation-augmented design aligns too closely with the covariate of interest. We remedy this by fixing a design-driven subset of rows and permuting only the remainder. The fixed rows are chosen by a greedy algorithm that maximizes a lower bound on power. This strategy reduces covariate-permutation collinearity while prese…

The COVID-19 Inflation Weighting in Israel
Jonathan Benchimol, Itamar Caspi, Yuval Levin
https://arxiv.org/abs/2506.09875 https://arx…

The COVID-19 Inflation Weighting in Israel
Significant shifts in the composition of consumer spending as a result of the COVID-19 crisis can complicate the interpretation of official inflation data, which are calculated by the Central Bureau of Statistics (CBS) based on a fixed basket of goods. We focus on Israel as a country that experienced three lockdowns, additional restrictions that significantly changed consumer behavior, and a successful vaccination campaign that has led to the lifting of most of these restrictions. We use credit…