Super-cool Dark Matter

TL;DR

This paper proposes a novel dark matter production mechanism via super-cooling during low-scale inflation in dimensionless theories, linking it to QCD phase transition and baryogenesis.

Contribution

It introduces a new super-cooling based mechanism for dark matter relic density generation in dimensionless models with low-scale inflation.

Findings

Super-cooling suppresses dark matter abundance to observed levels.

The mechanism operates at the QCD phase transition scale.

It applies to both old and new dimensionless models.

Abstract

In dimension-less theories of dynamical generation of the weak scale, the Universe can undergo a period of low-scale inflation during which all particles are massless and super-cool. This leads to a new mechanism of generation of the cosmological Dark Matter (DM) relic density: super-cooling can easily suppress the amount of DM to the desired level. This is achieved for TeV-scale DM, if super-cooling ends when quark condensates form at the QCD phase transition. Along this scenario, the baryon asymmetry can be generated either at the phase transition or through leptogenesis. We show that the above mechanism takes place in old and new dimension-less models.