Tootfinder

A research paper published by the US Department of Agriculture (USDA), though not yet peer-reviewed,
has found nearly all bee colonies suffering collapse had contracted a bee virus spread by
parasitic mites that appear to have developed resistance to the main chemicals used to control them.
Varroa mites
– equivalent in size to a dinner plate on a human body
– crawl and jump between worker bees.
If there are no infections present, they do not typically dama…

Penalizing Transparency? How AI Disclosure and Author Demographics Shape Human and AI Judgments About Writing
Inyoung Cheong, Alicia Guo, Mina Lee, Zhehui Liao, Kowe Kadoma, Dongyoung Go, Joseph Chee Chang, Peter Henderson, Mor Naaman, Amy X. Zhang
https://arxiv.org/abs/2507.01418

Penalizing Transparency? How AI Disclosure and Author Demographics Shape Human and AI Judgments About Writing
As AI integrates in various types of human writing, calls for transparency around AI assistance are growing. However, if transparency operates on uneven ground and certain identity groups bear a heavier cost for being honest, then the burden of openness becomes asymmetrical. This study investigates how AI disclosure statement affects perceptions of writing quality, and whether these effects vary by the author's race and gender. Through a large-scale controlled experiment, both human raters (n =…

Singularity Blockchain Key Management via non-custodial key management
Sumit Vohra
https://arxiv.org/abs/2506.02282 https://arxiv.org…

Singularity Blockchain Key Management via non-custodial key management
web3 wallets are key to managing user identity on blockchain. The main purpose of a web3 wallet application is to manage the private key for the user and provide an interface to interact with the blockchain. The key management scheme ( KMS ) used by the wallet to store and recover the private key can be either custodial, where the keys are permissioned and in custody of the wallet provider or noncustodial where the keys are in custody of the user. The existing non-custodial key management schem…

Identifying hyperons in neutron star matter from the slope of the mass-radius diagram
M\'arcio Ferreira, Constan\c{c}a Provid\^encia
https://arxiv.org/abs/2506.00550

Identifying hyperons in neutron star matter from the slope of the mass-radius diagram
The slope of the neutron star mass radius curve $dM/dR$ determined from two large sets of relativistic mean field equations of state for nucleonic and hyperonic neutron star matter is discussed. It is shown that if the mass-radius curve always has a negative slope the probability that the star has hyperons is very small. A very small probability of the presence of hyperons can already be identified by a negative slope for low-mass stars. A positive slope at $M/M_{\odot} = 1.4$, could indicate t…

Critical Metallicity of Cool Supergiant Formation. II. Physical Origin
Po-Sheng Ou, Ke-Jung Chen
https://arxiv.org/abs/2506.01753 https://

Critical Metallicity of Cool Supergiant Formation. II. Physical Origin
This study investigates the physical origin of the critical metallicity ($Z_{\rm c}\sim 0.001$) required for the formation of cool supergiants, as revealed by stellar evolution models. Using model grids that vary in mass, metallicity, opacity, and nuclear reaction rates, we identify a threshold terminal-age main-sequence (TAMS) radius ($R_{\rm T}$) that determines whether a star of a given mass can evolve into the red supergiant (RSG) phase. Through stellar models and homology relations, we sho…

Spectroscopic Analysis of Pictor II: a very low metallicity ultra-faint dwarf galaxy bound to the Large Magellanic Cloud
A. B. Pace (University of Virginia), T. S. Li, A. P. Ji, J. D. Simon, W. Cerny, A. M. Senkevich, A. Drlica-Wagner, K. Bechtol, C. Y. Tan, A. Chiti, D. Erkal, C. E. Mart\'inez-V\'azquez, P. S. Ferguson, R. G. Kron, K R. Atzberger, A. Chaturvedi, J. A. Frieman, N. Kallivayalil, G. Limberg, G. E. Medina, V. M. Placco, A. H. Riley, D. J. Sand, G. S. Stringfellow,…

Spectroscopic Analysis of Pictor II: a very low metallicity ultra-faint dwarf galaxy bound to the Large Magellanic Cloud
We present Magellan/IMACS and Magellan/MIKE spectroscopy of the ultra-faint dwarf (UFD) galaxy Pictor~II (Pic~II) that is located only 12 kpc from the Large Magellanic Cloud (LMC). From the IMACS spectroscopy, we identify 13 member stars and measure a mean heliocentric velocity of $326.9\pm1.1~{\rm km~s^{-1}}$, a velocity dispersion of $3.5_{-0.9}^{+1.1}~{\rm km~s^{-1}}$, a mean metallicity of $\overline{\rm [Fe/H]}=-2.99\pm0.06$, and an upper limit on the metallicity dispersion of $σ_{\rm [Fe…

This https://arxiv.org/abs/2502.01164 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_sta…

Tightening Causal Bounds via Covariate-Aware Optimal Transport
Causal estimands can vary significantly depending on the relationship between outcomes in treatment and control groups, potentially leading to wide partial identification (PI) intervals that impede decision making. Incorporating covariates can substantially tighten these bounds, but requires determining the range of PI over probability models consistent with the joint distributions of observed covariates and outcomes in treatment and control groups. This problem is known to be equivalent to a c…

Benchmark brown dwarfs -- I. A blue M2 T5 wide binary and a probable young M4 [T7 T8] hierarchical triple
Z. H. Zhang, F. Navarete, M. C. G\'alvez-Ortiz, H. R. A. Jones, A. J. Burgasser, P. Cruz, F. Marocco, N. Lodieu, Y. Shan, B. Gauza, R. Raddi, M. R. Huang, R. L. Smart, S. Baig, G. Cheng, D. J. Pinfield
https://arxi…

Benchmark brown dwarfs -- I. A blue M2 + T5 wide binary and a probable young M4 + [T7 + T8] hierarchical triple
Benchmark brown dwarfs in wide binary systems are crucial for characterizing substellar objects and calibrating atmospheric and evolutionary models. However, brown dwarf benchmarks with subsolar metallicity, very cool temperatures, or suitability for dynamical mass measurements are rare, limiting our understanding across the full range of mass, age, and metallicity. We present the discovery of two new multiple systems containing T dwarf companions, identified through a targeted search using Cat…

A Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10
Xiangyu Li, Huiling Chen, Yang Huang, Huawei Zhang, Timothy C. Beers, Linxuan Zhu, Jifeng Liu
https://arxiv.org/abs/2506.09705

A Metallicity Catalog of Very Metal-poor Main-sequence Turn-off and Red Giant Stars from LAMOST DR10
We present a catalog of 8,440 candidate very metal-poor (VMP; [Fe/H] < -2.0) main-sequence turn-off (MSTO) and red giant stars in the Milky Way, identified from low-resolution spectra in LAMOST DR10. More than 7,000 of these candidates are brighter than G ~ 16, making them excellent targets for high-resolution spectroscopic follow-up with 4-10 meter-class telescopes. Unlike most previous studies, we employed an empirical calibration to estimate metallicities from the equivalent widths (EWs) of …

Spectroscopic orbit and variability of the Be star V1624 Cyg = 28 Cyg
P. Harmanec, S. Yang, P. Koubsk\'y, J. Labadie-Bartz, P. Dole\v{z}al, S. Ranguin, H. Bo\v{z}i\'c, J. \v{S}vr\v{c}kov\'a, M. Zummer, P. Zasche, H. Ak
https://arxiv.org/abs/2506.06722

Spectroscopic orbit and variability of the Be star V1624 Cyg = 28 Cyg
In recent years the idea, first formulated many decades ago, that the Be phenomenon could be causally related to the duplicity of Be stars, has been repeatedly reconsidered from various perspectives. It is important, therefore, to have reliable information on Be stars, which are confirmed members of binary systems. This study is devoted to V1624 Cyg = 28 Cygni, which was recently identified as a binary with a compact secondary. By measuring the radial velocities (RVs) of the wings of the H alph…