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@toxi@mastodon.thi.ng
2025-06-22 07:00:03

Summer solstice 2025
Short (5km), but absolutely stunning hike with my son to make the most of the solstice evening, with some grand views, sunset, radler and an adventurous T3 path along a steep 400m cliff drop-off... Back at the trailhead after 10pm, still not dark. Summer evenings...
#SilentSunday

Photo of an alpine ridge line with steep rocky cliffs and lush pine forest. The sun is almost dipping behind the mountains in the back and the sky is illuminated in golden glow.
@arXiv_hepph_bot@mastoxiv.page
2025-06-18 09:46:41

Dark Matter Freeze-In and Small-Scale Observables: Novel Mass Bounds and Viable Particle Candidates
Francesco D'Eramo, Alessandro Lenoci, Ariane Dekker
arxiv.org/abs/2506.13864

Dark Matter Freeze-In and Small-Scale Observables: Novel Mass Bounds and Viable Particle Candidates
The suppression of cosmological structure at small scales is a key signature of dark matter (DM) produced via freeze-in in the low-mass regime. We present a comprehensive analysis of its impact, incorporating recent constraints from Milky Way satellite counts, strong gravitational lensing with JWST data, and the Lyman-$α$ forest. We adopt a general strategy to translate existing warm dark matter (WDM) bounds into lower mass limits for a broad class of DM candidates characterized by quasi-therm…

@UP8@mastodon.social
2025-06-25 02:54:11

My son, my wife and our friend who helped us put up hay this evening (I helped too!)
#photo #photography #portrait #hay

Three people sit in a red metal hay wagon with dark forest in the background and a wood floor littered with loose grass. Left to right: (1) man wearing a blue shirt, cream pants, red gloves, dark glasses and decorated red sombrero, (2) woman with blue shirt and pants, long hair and hat and (3) younger woman with shorts, tank top, and tied up hair
@arXiv_astrophCO_bot@mastoxiv.page
2025-06-19 09:15:57

The effects of continuum fitting on Lyman-$\alpha$ forest correlations
Nicolas Busca, James Rich, Julian Bautista, Andrei Cuceu, Andreu Font-Ribera, Julien Guy, Hiram K. Herrera-Alcantar, Julianna Stermer, Christophe Balland, J. Aguilar, S. Ahlen, D. Bianchi, D. Brooks, T. Claybaugh, A. de la Macorra, P. Doel, S. Ferraro, J. E. Forero-Romero, E. Gazta\~naga, C. Gordon, G. Gutierrez, M. Ishak, R. Kehoe, D. Kirkby, A. Kremin, M. Landriau, L. Le Guillou, C. Magneville, P. Martini, R. Miqu…

The effects of continuum fitting on Lyman-$α$ forest correlations
Correlations of fluctuations of the flux in Lyman-$α$ forests of high-redshift quasars have been observed by the Baryonic Acoustic Oscillation Spectroscopy Survey (BOSS) and the Dark Energy Spectroscopy Instrument (DESI) survey where they have revealed the effects of baryon acoustic oscillations (BAO). In order to fit the correlation functions to a physical model and thereby constrain cosmological parameters, it is necessary to take into account the effects of fitting the observed spectra to a…

@toxi@mastodon.thi.ng
2025-06-20 07:09:33

Hochplatte and Geiselstein, last night.
(In the 2nd image, Zugspitze appearing like a mirage in the far back haze...)
#ForestFriday #LandscapePhotography #Photography

B&W photo of a large mountain massif (Hochplatte, 2079m) rising up behind lower ridges of dark dense forest. Inbetween, the imposing tooth-like Geiselstein rock.
B&W photo of the north-eastern side of Hochplatte with the forested valley in front, and the Zugspitze (Germany's tallest mountain) in the hazy background, its peak surrounded by clouds.
@compfu@mograph.social
2025-06-11 18:40:06

I found this a nice and interesting video essay about the Dark Forest hypothesis in sci-fi literature:
youtube.com/watch?v=X0SvgT9Lc2
I usually don't dare clicking on new recommended channels on Youtube because I don't know if that's some crap…