Tootfinder

Gravitational Recoil and Suppression of Super Massive Black Hole Seeds in the Early Universe
Bisweswar Sen
https://arxiv.org/abs/2509.10564 https://arxiv.o…

Gravitational Recoil and Suppression of Super Massive Black Hole Seeds in the Early Universe
We investigate the impact of gravitational-wave (GW) recoil on the growth of supermassive black holes (SMBHs) in the early Universe. Forming ~10^9 Msun SMBHs by z ~ 6 is challenging and may require hierarchical mergers of smaller seed black holes. We extend a semi-analytic seed model (Sassano et al. 2021) by explicitly incorporating GW recoil physics. Our model includes: (1) recoil velocity formulae calibrated to numerical relativity for spinning, unequal-mass BH binaries (Campanelli et al. 200…

from my link log —
Route 53 DNS: Amazon’s premier AWS database.
https://www.lastweekinaws.com/blog/route-53-amazons-premier-database/
saved 2021-02-18

Route 53, Amazon’s Premier Database
I’ve periodically made reference in a bunch of places to Route 53 being my preferred database. But I’ve only really told the story in podcast and tweet

The UK Electoral Commission says it took three years and over £250K to recover from an August 2021 hack that exposed private data of 40M voters to Chinese spies (Joe Tidy/BBC)
https://www.bbc.com/news/articles/c80gl8yvj9go

Elections watchdog admits 'painful lessons learned' after Chinese hack
In the first interview about the hack, the commission's new boss admits that huge mistakes were made, but says the organisation is now secure.

A CSB safety video on the fatal release of acetic acid at the LyondellBasell La Porte Complex in La Porte, Texas, on July 27, 2021, that killed two contract workers.
https://m.youtube.com/watch?v=hxkRjkuFQBw

Gear Fever - Musicians, Take Your Temperature
#MusicianTips #GAS #GearAcquisitionSyndrome

Gear Fever - Musicians, Take Your Temperature
Stan Stewart - @muz4now

cofe: Collaboration in Financial Economics (2021)
Network of authors and commenters of papers in finantial economics, obtained from the acknowledgement sections of over 5,000 published research papers.
This network has 13967 nodes and 102039 edges.
Tags: Social, Directed, Weighted, Online, Collaboration
https://networks.ske…

Frequency-Aware Ensemble Learning for BraTS 2025 Pediatric Brain Tumor Segmentation
Yuxiao Yi, Qingyao Zhuang, Zhi-Qin John Xu
https://arxiv.org/abs/2509.19353 https://

Frequency-Aware Ensemble Learning for BraTS 2025 Pediatric Brain Tumor Segmentation
Pediatric brain tumor segmentation presents unique challenges due to the rarity and heterogeneity of these malignancies, yet remains critical for clinical diagnosis and treatment planning. We propose an ensemble approach integrating nnU-Net, Swin UNETR, and HFF-Net for the BraTS-PED 2025 challenge. Our method incorporates three key extensions: adjustable initialization scales for optimal nnU-Net complexity control, transfer learning from BraTS 2021 pre-trained models to enhance Swin UNETR's gen…

Reflection: Nature Is a Mirror - Don't Miss What It Reflects https://muz4now.com/2021/reflection-nature-is-a-mirror-dont-miss-what-it-reflects/

Reflection: Nature Is a Mirror - Don't Miss What It Reflects
Stan Stewart - @muz4now

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…

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…