Tootfinder

The limits of #cosmology: #telescopes that we can dream about, at wavelengths spanning decimetric radio through optical to terahertz FIR. [...] Here I will set out my vision of the case for #LunarAstronomy over the next several decades."

Strong progenitor age bias in supernova #cosmology – I. Robust and ubiquitous evidence from a larger sample of host galaxies in a broader redshift range / II. Alignment with DESI BAO and signs of a non-accelerating universe: https://academic.oup.com/mnras/article/538/4/3340/8098234 / https://academic.oup.com/mnras/article/544/1/975/8281988 -> Universe's expansion 'is now slowing, not speeding up': https://ras.ac.uk/news-and-press/research-highlights/universes-expansion-now-slowing-not-speeding (this has been claimed by the group since at least 2023 - http://vietnam.in2p3.fr/2023/windows/transparencies/02_tuesday/Astro_5/01_Son.pdf - and is rejected by the SN cosmology community as https://bsky.app/profile/astromarc.bsky.social/post/3m4xmikwfds26 explains).

Hot #cosmology papers ...
The Perfect Host - JWST Cepheid Observations in a Background-Free SN Ia Host Confirm No Bias in Hubble-Constant Measurements: https://arxiv.org/abs/2509.01667
Glimmers in the Cosmic Dawn - On the Photometrically Determined Black Hole Mass to Stellar Mass Relation Across Cosmic Time: https://arxiv.org/abs/2508.15905
The coherent satellite velocity field around the interacting spiral galaxy pair NGC5713/19 - signature of two galaxy groups merging: https://academic.oup.com/mnras/article/542/1/62/8215207?login=false
Looking beyond lambda: https://arxiv.org/abs/2509.00359

I was reading somewhere an explanation for why the night skies are not totally whited out by the brazillions of galaxies and stars in the universe. Spoiler: it’s cuz some of them are so far away their light hasn’t reached us yet, and some are moving away from us so their light will be mega-redshifted. So if a star or galaxy is far enough away & moving away from us, will it wink out at some point when it zooms beyond the threshold?

Warm Inflation with the Standard Model: #cosmology