Tootfinder

A Study of Spectral Variability between flaring and non-flaring state in M74 X-1
Aman Upadhyay, Tanuman Ghosh, Vikram Rana
https://arxiv.org/abs/2509.12050 https://

A Study of Spectral Variability between flaring and non-flaring state in M74 X-1
We conducted an extensive long-term spectral and timing study of the ultraluminous X-ray source (ULX) M74 X-1, using data taken between 2001 and 2021 by Chandra and XMM-Newton X-ray observatories. Our analysis shows that flares are present in some observations, whereas they are absent in others. Flaring state exhibits two-component spectra at a lower average flux level, whereas the non-flaring state displays single-component spectra at a higher average flux level. The M74 X-1 spectra are best d…

Efficient Polynomial Identity Testing Over Nonassociative Algebras
Partha Mukhopadhyay, C Ramya, Pratik Shastri
https://arxiv.org/abs/2509.11349 https://ar…

Efficient Polynomial Identity Testing Over Nonassociative Algebras
We design the first efficient polynomial identity testing algorithms over the nonassociative polynomial algebra. In particular, multiplication among the formal variables is commutative but it is not associative. This complements the strong lower bound results obtained over this algebra by Hrubeš, Yehudayoff, and Wigderson (2010) and Fijalkow, Lagarde, Ohlmann, and Serre (2021) from the identity testing perspective. Our main results are the following: (1) We construct nonassociative algebras …

The HST Ultraviolet Spectrum of V723 Mon: Additional Evidence of a Stellar Companion
C. S. Kochanek (Department of Astronomy, The Ohio State University), K. Z. Stanek (Department of Astronomy, The Ohio State University), T. A. Thompson (Department of Astronomy, The Ohio State University), T. Jayasinghe (Independent Researcher)
https://arxi…

The HST Ultraviolet Spectrum of V723 Mon: Additional Evidence of a Stellar Companion
V723 Mon is a high mass function (f=1.7Msun) single lined spectroscopic binary with a red giant primary that Jayasinghe et al. (2021) suggested had a black hole as its massive companion. Unfortunately, el-Badry et al. (2022) demonstrated that it had a hotter stellar companion whose detectability in optical spectra was difficult due to its rapid rotation. Here we confirm the presence of the stellar companion with a Hubble Space Telescope STIS ultraviolet spectrum.

Pressure dependent structure of neat liquid methanol, CH3OH: molecular dynamics simulations with various united atom type potentials
Imre Bak\'o, L\'aszl\'o Pusztai, Orest Pizio
https://arxiv.org/abs/2509.12834

Pressure dependent structure of neat liquid methanol, CH3OH: molecular dynamics simulations with various united atom type potentials
Molecular dynamics computer simulations have been conducted on neat liquid methanol, using three different united atom (three site) interatomic potentials: TraPPE [J. Phys. Chem. B 105, 3093 (2001)], UAM-I [J. Mol. Liq. 323, 114576 (2021)] and OPLS/2016 [J. Chem. Phys. 145, 034508 (2016)]. The effects of pressure, between 1 bar and 6 kbar, have been evaluated on total scattering structure factors, partial radial distribution functions, as well as on collective characteristics such as ring size …

The impact on health system expenditure in Australia and OECD countries from accelerated NCD mortality decline through prevention or treatment strategies to achieve Sustainable Development Goal Target 3.4
Bibha Dhungel, Jingjing Yang, Tim Wilson, Samantha Grimshaw, Emily Bourke, Stephanie Khuu, Tony Blakely
https://arxiv.org/abs/2509.10795…

The impact on health system expenditure in Australia and OECD countries from accelerated NCD mortality decline through prevention or treatment strategies to achieve Sustainable Development Goal Target 3.4
Background: It is unclear what the relative impacts of prevention or treatment of NCDs are on future health system expenditure. First, we estimated expenditure in Australia for prevention vs treatment pathways to achieve SDG target 3.4. Second, we applied the method to 34 other OECD countries. Methods: We used GBD data to estimate average annual percentage changes in disease incidence, remission, and CFRs from 1990-2021, and projected to 2030 to estimate business-as-usual (BAU) reductions in …

Estimating Global HIV Prevalence in Key Populations: A Cross-Population Hierarchical Modeling Approach
Jiahao Zhang, Keith Sabin, Le Bao
https://arxiv.org/abs/2509.10664 https:/…

Estimating Global HIV Prevalence in Key Populations: A Cross-Population Hierarchical Modeling Approach
Key populations at high risk of HIV infection are critical for understanding and monitoring HIV epidemics, but global estimation is hampered by sparse, uneven data. We analyze data from 199 countries for female sex workers (FSW), men who have sex with men (MSM), and people who inject drugs (PWID) over 2011-2021, and introduce a cross-population hierarchical model that borrows strength across countries, years, and populations. The model combines region- and population-specific means with country…

Insurance tech company Ethos, last valued at $2.7B in 2021, files for a US IPO ; its revenue rose 54.9% YoY to $183.7M in H1, with net income up 64% to $30.7M (Lucinda Shen/Axios)
https://www.axios.com/pro/fintech-deals/2025/09/26/sequoia-accel-ethos-ipo…

Sequoia, Accel-backed Ethos files for IPO
The life insurance tech company was last valued at $2.7 billion.

"DRC finally moves to protect African gray parrots from unsustainable trade Didier Makal"
#DRC #Parrots #Animals

DRC finally moves to protect African gray parrots from unsustainable trade
LUBUMBASHI, DRC — African gray parrot populations in the central and northern parts of the Democratic Republic of Congo are declining. Data collected by patrols carried out by the Lukuru Foundation in Lomami Luidjo, Maniema province, show a worrying decline of 36% in the numbers of Psittacus erithacus observed between 2016 and 2021. In August […]

Das war schockierend ahnungslos: Esra Limbacher ist direkt gewählter Wahlkreisabgeordneter und seit 2021 im Bundestag und dort stellv. Vorsitzender der SPD-Bundestagsfraktion. Er ist zudem seit 2023 Generalsekretär der SPD Saarland.
Was er gerade im Deutschlandfunk zum Klimaschutz gesagt hat - oder nicht sagen konnte, sollte der SPD Sorgen machen. Hört selbst:

Beschleunigung des Klimawandels? Interview Esra Limbacher, SPD-Fraktions-Vize

Response to Promises and Pitfalls of Deep Kernel Learning
Andrew Gordon Wilson, Zhiting Hu, Ruslan Salakhutdinov, Eric P. Xing
https://arxiv.org/abs/2509.21228 https://

Response to Promises and Pitfalls of Deep Kernel Learning
This note responds to "Promises and Pitfalls of Deep Kernel Learning" (Ober et al., 2021). The marginal likelihood of a Gaussian process can be compartmentalized into a data fit term and a complexity penalty. Ober et al. (2021) shows that if a kernel can be multiplied by a signal variance coefficient, then reparametrizing and substituting in the maximized value of this parameter sets a reparametrized data fit term to a fixed value. They use this finding to argue that the complexity penalty, a l…

Leaked letter: NLRB drops claims against Tim Cook, including that he violated workers' rights with a 2021 email threatening staffers who leak confidential info (Josh Eidelson/Bloomberg)
https://www.bloomberg.com/news/articles/20

Sherif Mansour, #OWASP's 2021 Chair of the Global Board of Directors, was recently diagnosed with #leukemia and is urging everyone to donate blood to help those in need.

Anzahl der registrierten #Balkonkraftwerke in #Deutschland mit Stand vom 26.10.2025.
Der aktuelle Höchststand liegt bei 1167083 registrierten Anlagen.
Unplausible Inbetriebnahmedaten von 1900 bis 2017 wurden durch das Registrierungsdatum der

Exactly what happened to me a few years back, a $1000 from Jan to Feb. https://mastodon.social/@FluentInFinance/115268053823388595

Andrew Lokenauth (@FluentInFinance@mastodon.social)
Attached: 1 image A $400,000 mortgage is $2,500 per month today. A $400,000 mortgage was $1,500 per month in 2021. $1,000 more a month for the same house. Wild.

Adversarial Defense in Cybersecurity: A Systematic Review of GANs for Threat Detection and Mitigation
Tharcisse Ndayipfukamiye, Jianguo Ding, Doreen Sebastian Sarwatt, Adamu Gaston Philipo, Huansheng Ning
https://arxiv.org/abs/2509.20411

Adversarial Defense in Cybersecurity: A Systematic Review of GANs for Threat Detection and Mitigation
Machine learning-based cybersecurity systems are highly vulnerable to adversarial attacks, while Generative Adversarial Networks (GANs) act as both powerful attack enablers and promising defenses. This survey systematically reviews GAN-based adversarial defenses in cybersecurity (2021--August 31, 2025), consolidating recent progress, identifying gaps, and outlining future directions. Using a PRISMA-compliant systematic literature review protocol, we searched five major digital libraries. From 8…

Top NFL player prop expert's best bets for Week 4 include backing Daniel Jones

https://www.cbssports.com/betting/news/top-nfl-player-prop-expert…

🔥 A global wildfire paradox: Human impacts worsen even as total burned area declines
#environment

A global wildfire paradox: Human impacts worsen even as total burned area declines
Researchers at the University of California, Irvine and other institutions have spotted a contradiction in worldwide wildfire trends: Despite a 26% decline in total burned area from 2002 to 2021, the number of people exposed to wildfires has surged by nearly 40%.

Extending the short gamma-ray burst population from sub-threshold triggers in Fermi/GBM and GECAM data and its implications
Ce Cai, Shao-Lin Xiong, Yan-Qiu Zhang, Jin-Peng Zhang, Ping Wang, Yao-Guang Zheng, Shi-Jie Zheng, Shuo Xiao, Hao-Xuan Guo, Jia-Cong Liu, Yang-Zhao Ren, Wen-Jun Tan, Chen-Wei Wang, Yue Wang, Sheng-Lun Xie, Wang-Chen Xue, Zheng-Hang Yu, Peng Zhang, Wen-Long Zhang, Chao Zheng, Jia-Wei Luo, Shuai Zhang, Li-Ming Song, Shuang-Nan Zhang

Extending the short gamma-ray burst population from sub-threshold triggers in Fermi/GBM and GECAM data and its implications
Detection of short gamma-ray bursts (SGRBs) is critically important for the research of compact object mergers and multi-messenger astrophysics, but a significant part of SGRBs fall below the trigger threshold of GRB detectors, and thus are often missed. Here we present a systematic search for and verification of missed SGRBs using Fermi/GBM subthreshold triggers, jointly analyzing data from GBM, GECAM-B, and GECAM-C. Among 466 Fermi/GBM sub-threshold events (with reliability >= 5) from 2021 to…

🇺🇦 Auf radioeins läuft...
Bat For Lashes:
🎵 Home
#NowPlaying #BatForLashes
https://batforlashes.bandcamp.com/album/livestream-at-home-los-angeles-2021
https://open.spotify.com/track/4gXSQjrANdHYBxJpJO8Gcv

Ergodic Properties of Quantum Markov Semigroups
Nicolas Mousset, Nina H. Amini
https://arxiv.org/abs/2509.20133 https://arxiv.org/pdf/2509.20133

Ergodic Properties of Quantum Markov Semigroups
In this paper, we study the ergodic theorem for infinite-dimensional quantum Markov semigroups, originally introduced by Frigerio and Verri in 1982, and its latest version developed by Carbone and Girotti in 2021. We provide a sufficient condition that ensures exponential convergence towards the positive recurrent subspace, a well-known result for irreducible quantum Markov semigroups in finite-dimensional Hilbert spaces. Several illustrative examples are presented to demonstrate the applicatio…

Female Student Population at Kabul University Before the 2021 Ban: Trends, Gender Parity, and Faculty-Level Dynamics
Jawid Ahmad Baktash, Mursal Dawodi
https://arxiv.org/abs/2509.20406

Female Student Population at Kabul University Before the 2021 Ban: Trends, Gender Parity, and Faculty-Level Dynamics
For nearly two decades after 2001, Afghanistan's higher education sector expanded rapidly, with Kabul University serving as a central site of women's academic participation. Drawing on administrative records of student populations from 2016-2019 (Islamic calendar 1395-1398), this study examines gender distributions across shifts, faculties, and departments, with particular attention to STEM versus non-STEM fields. At Kabul University, the morning shift refers to the main daytime cohort (includi…

Ultra-Wideband Polarimetry of the April 2021 Profile Change Event in PSR J1713 0747
Rami F. Mandow, Andrew Zic, J. R. Dawson, Shuangqiang Wang, Malgorzata Curylo, Shi Dai, Valentina Di Marco, George Hobbs, Vivek Gupta, Agastya Kapur, M. Kerr, Marcus E. Lower, Saurav Mishra, Daniel Reardon, Christopher J. Russell, Ryan M. Shannon, Lei Zhang, Xingjiang Zhu
https:…

Ultra-Wideband Polarimetry of the April 2021 Profile Change Event in PSR J1713+0747
The millisecond pulsar PSR J1713+0747 is a high-priority target for pulsar timing array experiments due to its long-term timing stability, and bright, narrow pulse profile. In April 2021, PSR~J1713$+$0747 underwent a significant profile change event, observed by several telescopes worldwide. Using the broad-bandwidth and polarimetric fidelity of the Ultra-Wideband Low-frequency receiver on Murriyang, CSIRO's Parkes radio telescope, we investigated the long-term spectro-polarimetric behaviour of…

Top NFL player prop expert's best bets for Week 3 include backing Tyler Warren

https://www.cbssports.com/betting/news/top-nfl-player-prop-expert…

Variations of the vector magnetic structures in the solar polar regions observed by Hinode
Shuhong Yang, Chunlan Jin, Qiao Song, Yuzong Zhang, Yin Li, Yijun Hou, Ting Li, Guiping Zhou, Yuanyong Deng, Jingxiu Wang
https://arxiv.org/abs/2509.19739

Variations of the vector magnetic structures in the solar polar regions observed by Hinode
Using the polar vector magnetic field data observed by Hinode from 2012 to 2021, we study the long-term variations of the magnetic flux, the flux proportion of different polarities, and the magnetic inclination with respect to the local normal in the solar polar regions above 70 degree latitude during solar cycle 24. In both polar regions after the polarity reversal, the unsigned magnetic fluxes of the dominant polarity increased to a peak of about 1.3$\times$10$^{22}$ Mx during the solar minim…

🇺🇦 #NowPlaying on #BBC6Music's #TheRemixWithChrisHawkins
U2:
🎵 Lemon (The Perfecto Mix / Remastered 2021)
#U2
https://fernandopicon.bandcamp.com/track/u2-lemon-fernando-picon-bad-yard-rework
https://open.spotify.com/track/3GtaFJ4Zx7TEBU8yUXtdOx

Horizon-scale variability of M87* from 2017--2021 EHT observations
The Event Horizon Telescope Collaboration
https://arxiv.org/abs/2509.24593 https://arxiv…

Horizon-scale variability of M87* from 2017--2021 EHT observations
We report three epochs of polarized images of M87* at 230\,GHz using data from the Event Horizon Telescope (EHT) taken in 2017, 2018, and 2021. The baseline coverage of the 2021 observations is significantly improved through the addition of two new EHT stations: the 12\,m Kitt Peak Telescope and the Northern Extended Millimetre Array (NOEMA). All observations result in images dominated by a bright, asymmetric ring with a persistent diameter of $43.9\pm 0.6\,\muas$, consistent with expectations …

Backing the Saints' Chris Olave among top NFL player prop expert's best bets for Week 8

https://www.cbssports.com/betting/news/backi…

Multiwavelength study of Galactic PeVatron LHAASO J0341 5258
P. Bangale (for the VERITAS Collaboration), X. Wang (for the HAWC Collaboration)
https://arxiv.org/abs/2509.20515 ht…

Multiwavelength study of Galactic PeVatron LHAASO J0341+5258
Galactic PeVatrons are astrophysical sources accelerating particles up to a few PeV (~10$^{15}$ eV). The primary method to identify both electron and proton PeVatrons is the observation of $γ$-ray radiation at ultra-high energies (UHE; E$>$100 TeV). In 2021, LHAASO detected 14 steady $γ$-ray sources with photon energies above 100 TeV and up to 1.4 PeV. Most of these sources can be plausibly associated with objects such as supernova remnants, pulsar wind nebulae, and stellar clusters. However,…

Search for UHE neutrinos from GRBs with the Pierre Auger Observatory
Yago Lema-Capeans (for the Pierre Auger Collaboration)
https://arxiv.org/abs/2509.25962 https://

Search for UHE neutrinos from GRBs with the Pierre Auger Observatory
We report on the search for ultra-high-energy neutrinos from the prompt emission of gamma-ray bursts (GRBs) using Surface Detector (SD) data from Phase I of the Pierre Auger Observatory (2004-2021). A total of 570 GRBs occur within the most neutrino-sensitive field of view of the SD, considering both Earth-skimming and downward-going detection channels. For this purpose, GRB neutrino emission has been modeled using the numerical software NeuCosmA, incorporating gamma-ray measurements and inferr…

Magnetic Reconnection as a Potential Driver of X-ray Variability in Active Galactic Nuclei
Chen-Ran Hu, Yong-Feng Huang, Lang Cui, Hanle Zhang, Jiang-Tao Li, Li Ji, Jin-Jun Geng, Orkash Amat, Fan Xu, Chen Du, Wen-Long Zhang, Ze-Cheng Zou, Xiao-Fei Dong, Chen Deng, Pengfei Jiang, Jie Liao
https://arxiv.org/abs/2509.12978

Magnetic Reconnection as a Potential Driver of X-ray Variability in Active Galactic Nuclei
We present a systematic analysis on the X-ray variability in 13 bright quasars at z > 4.5, combining recent Swift observations from 2021 to 2023 and archival multi-epoch observations. Upper limits of the luminosity measurements were included in the analysis by using the Kaplan-Meier estimator method. It is found that the high-z quasars exhibit X-ray variability on both short-term (hours-to-days) and intermediate-term (weeks-to-months) timescales, with short-term variability dominating the overa…