Tootfinder

🌀 Simulations find ghostly whirls of dark matter trailing galaxy arms
https://arstechnica.com/science/2025/06/simulations-find-ghostly-whirls-of-dark-matter-trailing-galaxy-arms/

Simulations find ghostly whirls of dark matter trailing galaxy arms
Simulations suggest where we might look for the mystery material.

In between other stuff I've been running sims to dial in the ARC6 connector launch to back-side diff pairs.
After sweeping lots of variations I've concluded it's impossible to get it matched using 0.45 / 0.25mm ViP. You can't get above about 90 ohm Zdiff no matter how far you pull back the ground planes, just because of coupling between the vias themselves.
Orange trace is a first test using 0.35 / 0.15mm ViP which seems much happier. Slightly overshot so I need a…

Quantum Simulation of Electron Energy Loss Spectroscopy for Battery Materials
Alexander Kunitsa, Diksha Dhawan, Stepan Fomichev, Juan Miguel Arrazola, Minghao Zhang, Torin F. Stetina
https://arxiv.org/abs/2508.15935

Quantum Simulation of Electron Energy Loss Spectroscopy for Battery Materials
The dynamic structure factor (DSF) is a central quantity for interpreting a vast array of inelastic scattering experiments in chemistry and materials science, but its accurate simulation is a considerable challenge for classical computational methods. In this work, we present a quantum algorithm and an end-to-end simulation framework to compute the DSF, providing a general approach for simulating momentum-resolved spectroscopies. We apply this approach to the simulation of electron energy loss …

Anticipate, Simulate, Reason (ASR): A Comprehensive Generative AI Framework for Combating Messaging Scams
Xue Wen Tan, Kenneth See, Stanley Kok
https://arxiv.org/abs/2507.17543 …

Anticipate, Simulate, Reason (ASR): A Comprehensive Generative AI Framework for Combating Messaging Scams
The rapid growth of messaging scams creates an escalating challenge for user security and financial safety. In this paper, we present the Anticipate, Simulate, Reason (ASR) framework, a generative AI method that enables users to proactively identify and comprehend scams within instant messaging platforms. Using large language models, ASR predicts scammer responses, creates realistic scam conversations, and delivers real-time, interpretable support to end-users. We develop ScamGPT-J, a domain-sp…

Seeing Clearly, Forgetting Deeply: Revisiting Fine-Tuned Video Generators for Driving Simulation
Chun-Peng Chang, Chen-Yu Wang, Julian Schmidt, Holger Caesar, Alain Pagani
https://arxiv.org/abs/2508.16512

Seeing Clearly, Forgetting Deeply: Revisiting Fine-Tuned Video Generators for Driving Simulation
Recent advancements in video generation have substantially improved visual quality and temporal coherence, making these models increasingly appealing for applications such as autonomous driving, particularly in the context of driving simulation and so-called "world models". In this work, we investigate the effects of existing fine-tuning video generation approaches on structured driving datasets and uncover a potential trade-off: although visual fidelity improves, spatial accuracy in modeling d…

The Air Force needs to be prepared to fight against an adversary like China
in a highly contested environment where no side enjoys consistent air superiority.
A major part of the recent training involved the Space Force
and simulating how enemy forces would use space-based capabilities and technologies, like satellites and sensors,
in a potential high-end conflict.
Other components, like maintaining communications and command and control elements, were tested a…

US Air Force underwent a massive stress test in the Pacific
The exercise, the largest scale in the Pacific since the Cold War, looked at managing airpower across contested environments.

LLM-Based Social Simulations Require a Boundary
Zengqing Wu, Run Peng, Takayuki Ito, Chuan Xiao
https://arxiv.org/abs/2506.19806 https://

LLM-Based Social Simulations Require a Boundary
This position paper argues that large language model (LLM)-based social simulations should establish clear boundaries to meaningfully contribute to social science research. While LLMs offer promising capabilities for modeling human-like agents compared to traditional agent-based modeling, they face fundamental limitations that constrain their reliability for social pattern discovery. The core issue lies in LLMs' tendency towards an ``average persona'' that lacks sufficient behavioral heterogene…

A narrowband burst from FRB 20190520B simultaneously observed by FAST and Parkes
Yuhao Zhu, Chenhui Niu, Shi Dai, Di Li, Pei Wang, Yi Feng, Jingwen Wu, Yongkun Zhang, Xianghan Cui, Junshuo Zhang, Jinhuang Cao
https://arxiv.org/abs/2507.17696

A narrowband burst from FRB 20190520B simultaneously observed by FAST and Parkes
Fast Radio Bursts (FRBs) are short-duration radio transients with mysterious origins. Since its uncertainty, there are very few FRBs that are observed by different instruments, simultaneously. This study presents a detailed analysis of a burst from FRB 20190520B observed by FAST and Parkes at the same time. The spectrum of this individual burst ended at the upper limit of the FAST frequency band and was simultaneously detected by the Parkes telescope in the 1.5-1.8 GHz range. By employing spect…

Universal framework with exponential speedup for the quantum simulation of quantum field theories including QCD
Jad C. Halimeh, Masanori Hanada, Shunji Matsuura
https://arxiv.org/abs/2506.18966

Universal framework with exponential speedup for the quantum simulation of quantum field theories including QCD
We present a quantum simulation framework universally applicable to a wide class of quantum systems, including quantum field theories such as quantum chromodynamics (QCD). Specifically, we generalize an efficient quantum simulation protocol developed for bosonic theories in [Halimeh et al., arXiv:2411.13161] which, when applied to Yang-Mills theory, demonstrated an exponential resource advantage with respect to the truncation level of the bosonic modes, to systems with both bosons and fermions …

The full frequency sweep won't finish before I leave for REcon but I think I've finally got the ARF6 launch dialed in: better than -20 dB return loss from DC to 11.9 GHz, and better than -15.8 dB from DC to 30 GHz.
* Shrink vias from 0.45 pad / 0.25 drill to 0.35 / 0.15
* Use round vias for the signal lines as coupling seemed to be significant vs the square ones I tried to use to simplify meshing
* Keep non-functional via pads
* Single large ground plane cutout o…