4.9σ Evidence for Axions & Warm Dark Matter - eBOSS Lyα vs Planck CMB - Keir Rogers & Vivian Poulin

[@talks_curator728]

*Index to Key Parts of the Talk* [00:00] Shaun's intro [01:04] Overview comments by Keir and Viv [03:25] Two things to remember from this talk [06:45] Motivations for this work [11:35] Getting into the Details [15:57] All the cosmological info in the eBOSS Lyα forest compressed to two parameters [17:20] This compression is valid for all the models we consider (Fig. 4 from paper) [18:26] 4.9σ tension between eBOSS Ly-αf & Planck CMB (Fig. 1) [20:11] Clarifying comments by Shaun (editing insert) [23:27] CMB+BAO+SNe vs Lyα; power spectrum running, ULA, WDM (Fig. 2 top) [34:40] Tension missed when looking at omega_8, n_s (Fig. 2 bottom [36:35] Planck CMB+BAO+SNe+eBOSS Ly-αf constraints on primordial power spectrum (Fig. 3) [37:39] Planck CMB+BAO+SNe+eBOSS Ly-αf constraints on nature of dark matter (Fig. 3) [39:25] What else may be causing this discrepancy? [41:35] Where to next? [51:29] Vivian's supplemental comment on neutrino mass contraints [52:38] Keir - follow-up coming from DESI [52:59] What current work in cosmology is particularly underappreciated by the community? [55:23] Final question to Keir about how these findings relate to work discussed in an earlier Cosmology Talk

[@astronomy-channel]

Great vid! Such a great resource for theoretical cosmology! Dark Matter could easily turn out to be a FAMILY of particles, likely different axions, some ‘warmer’ than others perhaps…..

[@ChrisPattisonCosmo]

Very awesome video - thanks for this everyone, it was super interesting!

[@giottist3624]

Hmm, *warm* dark matter - sounds promising!

[@Thomas-gk42]

Just 5%? Doesn´t sound like an ultimate solution. Thank you anyway for this interesting talk and your work.

[@CosmologyTalks]

I guess it depends what one's goal is. If they're trying to fully explain all of dark matter then yes, if this turned out to be a real signal they've only made it 5% of the way. However, if the goal is to discover new fields, this would be a success. Most anomalies turn out to have more mundane explanations, but some survive and turn out to be new physics. Time will tell which bag this one belongs in 🤷