Why not Neutrinos as the Dark Matter? A Critical Review, KATRIN and New Research Directions

TL;DR

This paper critically examines the traditional view that cosmological neutrinos cannot be dark matter, proposing a mechanism for neutrino condensation into CNOs and discussing implications for dark matter research.

Contribution

It introduces the concept of relic neutrino condensation into CNOs via magnetic interactions, challenging existing bounds and suggesting new research directions.

Findings

Relic neutrinos can lose power through magnetic interactions with primordial fields.

Condensed neutrino objects (CNOs) could serve as dark matter candidates.

Experimental bounds may not exclude neutrino-based dark matter if CNO formation is considered.

Abstract

We challenge the traditional wisdom that cosmological (big bang relic) neutrinos can only be hot Dark Matter. We provide a critical review of the concepts, derivations and arguments in foundational books and recent publications that led respected researchers to proclaim that "[Dark Matter] cannot be neutrinos". We then provide the physics resulting in relic neutrino's significant power loss from the interaction of its anomalous magnetic moment with a high-intensity primordial magnetic fields, resulting in subsequent condensation into Condensed Neutrino Objects (CNOs). Finally, the experimental degenerate mass bounds that would rule out condensed cosmological neutrinos as the Dark Matter (unless there is new physics that would require a modification to the CNO Equation of State) are provided. We conclude with a discussion on new directions for research.