Baryomorphosis: Relating the Baryon Asymmetry to the "WIMP Miracle"

TL;DR

The paper introduces 'baryomorphosis', a framework linking baryon asymmetry to WIMP relic density, explaining their similar magnitudes and suggesting collider tests for the model.

Contribution

It proposes a novel scalar-based model that naturally relates baryon asymmetry to WIMP dark matter density through a new annihilon sector.

Findings

The model successfully reproduces the observed baryon-to-dark matter ratio.

It predicts collider signatures of annihilons at TeV-scale energies.

The framework offers a unified explanation for baryon asymmetry and dark matter coincidence.

Abstract

We present a generic framework, "baryomorphosis", which modifies the baryon asymmetry to be naturally of the order of a typical thermal relic WIMP density. We consider a simple scalar-based model to show how this is possible. This model introduces a sector in which a large initial baryon asymmetry is injected into particles ("annihilons") phi_B, \bar{phi}_B of mass ~ 100 GeV - 1 TeV. phi_B-\bar{phi}_B annihilations convert the initial phi_B, \bar{phi}_B asymmetry to a final asymmetry with a thermal relic WIMP-like density. This subsequently decays to a conventional baryon asymmetry whose magnitude is naturally related to the density of thermal relic WIMP dark matter. In this way the two coincidences of baryons and dark matter i.e. why their densities are similar to each other and why they are both similar to a WIMP thermal relic density (the "WIMP miracle"), may be understood. The model may be tested by the production of annihilons at colliders.