Tootfinder

Particle-Grid Neural Dynamics for Learning Deformable Object Models from RGB-D Videos
Kaifeng Zhang, Baoyu Li, Kris Hauser, Yunzhu Li
https://arxiv.org/abs/2506.15680

Particle-Grid Neural Dynamics for Learning Deformable Object Models from RGB-D Videos
Modeling the dynamics of deformable objects is challenging due to their diverse physical properties and the difficulty of estimating states from limited visual information. We address these challenges with a neural dynamics framework that combines object particles and spatial grids in a hybrid representation. Our particle-grid model captures global shape and motion information while predicting dense particle movements, enabling the modeling of objects with varied shapes and materials. Particles…

The DORCHA suite: nature, nurture, and the phase space distribution of the Milky Way's high redshift progenitors today
Sreedhar Balu, Chris Power, Kris Walker, J. Stuart B. Wyithe
https://arxiv.org/abs/2506.14016

The DORCHA suite: nature, nurture, and the phase space distribution of the Milky Way's high redshift progenitors today
Where in the present-day Milky Way should we search for the remnants of its earliest stars? We address this question using the DORCHA (Gaelic for Dark; DUR-uh-khuh) suite: a set of 25 high-resolution, dark-matter-only cosmological zoom-in simulations of Milky Way analogue (MWA) haloes evolved to $z=0$. Of these, 15 are isolated and the rest are in pairs, similar to the MW and M31. By identifying and tagging the most bound material in high-redshift ($z\geq5$) progenitor haloes -- those likely to…

Tech workers: let's not be too polite/proud/whatever to talk about money and make the most of what we have. This post from Kris will help us to inform ourselves, please share widely #linkTuesday

🇺🇦 #NowPlaying on #BBC6Music's #DonLettsCultureClashRadio
Kris Kemist:
🎵 Reggae Recipe Dub
#KrisKemist
https://realityshock.bandcamp.com/track/reggae-recipe-dub-2
https://open.spotify.com/track/2kzC5W2TCSPZOX0ChrbCaK

Numerical evolution of self-gravitating halos of self-interacting dark matter
Marc Kamionkowski, Kris Sigurdson, Oren Slone
https://arxiv.org/abs/2506.04334

Numerical evolution of self-gravitating halos of self-interacting dark matter
We discuss a modification of a recently developed numerical scheme for evolving spherically symmetric self-gravitating systems to include the effects of self-interacting dark matter. The approach is far more efficient than traditional N-body simulations and cross sections with different dependencies on velocity and scattering-angle are easily accommodated. To demonstrate, we provide results of a simulation, which runs quickly on a personal computer, that shows the expected initial flattening of…