With JWST it seems we might be able to get closer to an answer[1]. Sterile neutrinos[2] seemed like an obvious candidate, but we'll see how that pans out. Current searches aren't positive[3][4], but I suppose it's far to early to call it quits on that given the theoretical motivation.
With JWST it seems we might be able to get closer to an answer[1]. Sterile neutrinos[2] seemed like an obvious candidate, but we'll see how that pans out. Current searches aren't positive[3][4], but I suppose it's far to early to call it quits on that given the theoretical motivation.
[1]: https://arxiv.org/abs/2302.00030
[2]: https://arxiv.org/abs/2106.05913
[3]: https://phys.org/news/2022-11-analysis-closer-sterile-neutri...
[4]: https://phys.org/news/2023-01-results-stereo-sterile-neutrin...