In the Dark

It’s been far too long since I last shared another one of those interesting cosmology talks on the Youtube channel curated by Shaun Hotchkiss. This channel features technical talks rather than popular expositions so it won’t be everyone’s cup of tea but for those seriously interested in cosmology at a research level find them seriously informative.

In this one, Keir Rogers talks about Ultra-Light Dark Matter (ULDM; for a detailed review of this idea, see here). To summarize the argument, it seems that  ULDM consisting of a single particle can’t be responsible for all the dark matter, but this doesn’t mean it can’t exist. Keir Rogers discusses how much of the dark matter could be of ULDM form.

Another issue discussed here relates to the parameter S₈ quantifies the matter-density fluctuations on a scale of 8 h^-1 Mpc. There is a Cosmology Talk discussing the state of play with this parameter here. The structure-suppressing properties of ULDM could also have implications for the S₈ tension, i.e. maybe a small sub-component of ULDM is what is causing the apparently low S₈ in local measurements?

The paper describing this work can be found on the arXiv here and here is the video:

This entry was posted on March 6, 2023 at 4:20 pm and is filed under The Universe and Stuff with tags arXiv:2301.08361, Cosmology Talks, Keir Rogers, ULDM, Ultra-Light Dark Matter. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.