Dark Matter and Naturalness
Mark P. Hertzberg, McCullen Sandora

TL;DR
This paper explores natural dark matter models based solely on fundamental principles like relativity and quantum mechanics, avoiding additional symmetries or fine-tuning, leading to stable baryon-like candidates with specific cosmological implications.
Contribution
It introduces a systematic framework for constructing natural dark matter models without extra global symmetries, focusing on chiral models with confining gauge groups and analyzing their cosmological viability.
Findings
Stable dark matter candidates analogous to baryons are possible with a confinement scale around 100 TeV.
The minimal model involves a dark sector with $SU(3)\times SU(2)$ gauge groups and one generation of chiral dark quarks and leptons.
Potential impact on BBN due to massless dark leptons and possible solutions include a lower reheat temperature or additional heavy degrees of freedom.
Abstract
The Standard Model of particle physics is governed by Poincar\'e symmetry, while all other symmetries, exact or approximate, are essentially dictated by theoretical consistency with the particle spectrum. On the other hand, many models of dark matter exist that rely upon the addition of new added global symmetries in order to stabilize the dark matter particle and/or achieve the correct abundance. In this work we begin a systematic exploration into truly natural models of dark matter, organized by only relativity and quantum mechanics, without the appeal to any additional global symmetries, no fine-tuning, and no small parameters. We begin by reviewing how singlet dark sectors based on spin 0 or spin should readily decay, while pure strongly coupled spin 1 models have an overabundance problem. This inevitably leads us to construct chiral models with spin …
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