Cogenerating and Pre-annihilating Dark Matter by a New Gauge Interaction in a Unified Model

TL;DR

This paper proposes a unified model where a new gauge interaction cogenerates and pre-annihilates dark matter, linking its asymmetry to baryons and leptons, and explores a specific SU(7) realization.

Contribution

It introduces a novel mechanism combining cogeneration and pre-annihilation of dark matter within a grand unified theory framework.

Findings

Dark matter asymmetry can be linked to baryon asymmetry.

Heavy dark matter particles can be pre-annihilated via non-abelian sphalerons.

A specific SU(7) model realization is presented.

Abstract

Grand unified theories based on large groups (with rank greater or equal to 6 are a natural context for dark matter models. They contain Standard-Model-singlet fermions that could be dark matter candidates, and can contain new non-abelian interactions whose sphalerons convert baryons, leptons, and dark matter into each other, "cogenerating" a dark matter asymmetry comparable to the baryon asymmetry. In this paper it is shown that the same non-abelian interactions can "pre-annihilate" the symmetric component of heavy dark matter particles, which then decay late into light stable dark matter particles that inherit their asymmetry. It is shown that such decays can come from d=5 operators that are Planck or GUT suppressed. We derive constraints on such models and present a simple realization based on the group SU(7).