Conformal Freeze-In of Dark Matter

Abstract

We present the conformal freeze-in (COFI) scenario for dark matter production. At high energies, the dark sector is described by a gauge theory flowing towards a Banks-Zaks fixed point, coupled to the standard model via a non-renormalizable portal interaction. At the time when the dark sector is populated in the early universe, it is described by a strongly coupled conformal field theory. As the universe cools, cosmological phase transitions in the standard model sector, either electroweak or QCD, induce conformal symmetry breaking and confinement in the dark sector. One of the resulting dark bound states is stable on the cosmological time scales and plays the role of dark matter. With the Higgs portal, the COFI scenario provides a viable dark matter candidate with mass in a phenomenologically interesting 0.1-1 MeV range. With the quark portal, a dark matter candidate with mass around 1 keV is consistent with observations. Conformal bootstrap puts a non-trivial constraint on model building in this case.

arXiv comment6 + 2 pages, 3 figures. Minor changes; version to be published in PRD

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• The Continuum Dark Matter Zoo
• Dark Matter from a Conformal Dark Sector
• General Freeze-in and Freeze-out
• Conformal Freeze-In, Composite Dark Photon, and Asymmetric Reheating
• $a$-Anomalous Interactions of the Holographic Dilaton
• Freezing In with Lepton Flavored Fermions
• Conformal Leptogenesis in Composite Higgs Models
• Dark Walker in the Early Universe: A Strongly Coupled Sector Model