Tootfinder

The radial acceleration relation at the EDGE of galaxy formation - testing its universality in low-mass dwarf galaxies: #DarkMatter debate narrows thanks to dwarf galaxies: https://www.aip.de/en/news/dark-matter-debate-narrows/

Here are my favourites from the National Portrait Gallery's Portrait Award 2025. It's a fantastic selection this year, and free to see as always.
#art #portraits #painting

Non-linear structure formation with elastic interactions in the dark sector
Jose Beltr\'an Jim\'enez, David Figueruelo, David F. Mota, Hans A. Winther
https://arxiv.org/abs/2510.12551

Non-linear structure formation with elastic interactions in the dark sector
Cosmological models where dark matter interacts with dark energy via a pure momentum transfer and with no energy exchange (i.e. elastic) provide compelling scenarios for addressing the apparent lack of structures at low redshift. In particular, it has been shown that measurements of $S_8$ may show a statistically significant preference for the presence of elastic interactions. In this work we implement a specific realisation of these scenarios into an $N$-body code to explore the non-linear reg…

Self-interacting dark matter in the center of a Local Group dwarf galaxy and its satellites
Thales A. Gutcke, Giulia Despali, Stephanie O'Neil, Mark Vogelsberger, Azadeh Fattahi, David B. Sanders
https://arxiv.org/abs/2510.05258

Self-interacting dark matter in the center of a Local Group dwarf galaxy and its satellites
We present a detailed comparison of a Local Group dwarf galaxy analogue evolved in two cosmological models: the standard $Λ$CDM and a self-interacting dark matter (SIDM) model with a velocity-dependent cross-section. Both simulations are run with the high-resolution, hydrodynamical LYRA galaxy formation model, allowing us to explore the global and substructure properties of the dwarf in a consistent context. While the overall halo growth, final mass, and subhalo mass functions remain largely u…

Large-scale peculiar velocities in the #universe: https://arxiv.org/abs/2510.05340 (207 pages!) -> "The observed large-scale peculiar-velocity fields are believed to have originated as weak peculiar-velocity perturbations soon after equipartition, which have subsequently grown by structure formation and by the increasing inhomogeneity of the post-recombination universe. However, the evolution and the implications of these bulk velocity fields remain poorly understood and they are still a matter of debate."

Revisiting the formation of molecules and dust in core collapse supernovae
Isabelle Cherchneff, Dahbia Talbi, Jos\'e Cernicharo
https://arxiv.org/abs/2510.01079 https://

Revisiting the formation of molecules and dust in core collapse supernovae
Context. Core-collapse Supernovae of Type II contribute the chemical enrichment of galaxies through explosion. Their role as dust producers in the high-redshift Universe may be of paramount importance. However, the type and amount of dust they synthesise after outburst is still a matter of debate and the formation processes remain unclear. Aims. We aim to identify and understand the chemical processes at play in the dust formation scenario, and derive mass yields for molecules and dust cluste…

The Evolution of Pop III.1 Protostars Powered by Dark Matter Annihilation. II. Dependence on WIMP Properties
Konstantinos Topalakis, Devesh Nandal, Jonathan C. Tan
https://arxiv.org/abs/2510.00216

The Evolution of Pop III.1 Protostars Powered by Dark Matter Annihilation. II. Dependence on WIMP Properties
The rapid appearance of supermassive black holes (SMBHs) at $z\gtrsim7$ requires efficient pathways to form massive black hole seeds. We investigate whether annihilation of weakly interacting massive particles (WIMPs) can alter primordial (Pop III.1) protostellar evolution sufficiently to enable formation of such `heavy'' seeds. Using the one-dimensional Geneva stellar-evolution code (GENEC) with an implemented Gould single-scatter capture module, we compute a grid of protostellar evolution mod…