The IceCube neutrino observatory has reported null results regarding the sterile neutrino hypothesis, contributing to the ongoing discourse in Beyond Standard Model (BSM) physics. Key findings include the inability to detect sterile neutrinos, which, alongside other null results such as those from LUX and PandaX experiments, suggest that dark matter may not consist of Weakly Interacting Massive Particles (WIMPs) or sterile neutrinos. The implications of these findings necessitate a reevaluation of existing models and the exploration of alternative dark matter candidates, such as relict keV mass particles and self-interacting dark matter. The discussion emphasizes the importance of refining theoretical frameworks in light of experimental constraints.
PREREQUISITESPhysicists, researchers in particle physics, and anyone involved in the study of dark matter and neutrino physics will benefit from this discussion, particularly those focused on BSM theories and experimental results.
kodama said:feng proposes his boson is a spin-1 vector boson with axial and vectorlike currents
nikkkom said:Nonzero-spin fields with nonzero VEV break Lorentz invariance.
nikkkom said:Then how it generates neutrino mass?
nikkkom said:Higgs-like coupling (IOW: fermion to scalar field coupling) would require existence of RH neutrinos.
kodama said:what kind of dark matter is left?
[URL='https://www.physicsforums.com/insights/author/urs-schreiber/']Urs Schreiber[/URL] said:Fuzzy dark matter.
W. Hu, R. Barkana, and A. Gruzinov, “Cold and fuzzy dark matter,” Phys. Rev. Lett. 85, 1158–1161 (2000), https://arxiv.org/abs/astro-ph/0003365
One of the big conundrums is that the assumption of dark matter works extremely well on large scales for explaining the structure of the cosmos, but seems to fail to work on the scale of galaxies. One interesting idea how to fix this (without giving up on the established theory of gravity as MOND does) is to assume that dark matter consists of massive but extremely light particles, whose de Broglie wavelength is of the order of thousands of parsecs. This has the consequence that at around the scale of that wavelength the behaviour of this dark matter changes.
Now Edward Witten et al. have argued in more detail that this works really well, and consistent with existing null results on direct detection:
Lam Hui, Jeremiah P. Ostriker, Scott Tremaine, Edward Witten, "On the hypothesis that cosmological dark matter is composed of ultra-light bosons" https://arxiv.org/abs/1610.08297