Dark Matter from Conformal Sectors

TL;DR

This paper proposes a conformal-invariant dark sector model interacting via the Higgs portal, which naturally stabilizes dark matter and aligns with experimental bounds from LHC and Planck.

Contribution

It introduces a conformal symmetry framework that stabilizes dark matter and explains its small mass scale through electroweak symmetry breaking.

Findings

Model satisfies LHC and Planck constraints

Conformal symmetry ensures dark matter stability

Dark sector couplings determine dark matter mass

Abstract

We show that a conformal-invariant dark sector, interacting conformally with the Standard Model (SM) fields through the Higgs portal, provides a viable framework where cold dark matter (CDM) and invisible Higgs decays can be addressed concurrently. Conformal symmetry naturally subsumes the Z_2 symmetry needed for stability of the CDM. It also guarantees that the weaker the couplings of the dark sector fields to the SM Higgs field, the smaller the masses they acquire through elektroweak breaking. The model comfortably satisfies the bounds from Large Hadron Collider (LHC) and Planck Space Telescope (Planck 2013).