Self-Interacting Dark Matter with Naturally Light Mediator

TL;DR

This paper proposes a renormalizable dark matter model with light mediators to address the cusp-core problem in dwarf galaxies, using two scalar singlets under a broken global symmetry.

Contribution

It introduces a novel, complete renormalizable model for self-interacting dark matter with a naturally light mediator.

Findings

The model achieves natural light mediators compatible with electroweak scale dark matter.

It provides a theoretical framework for resolving small-scale structure issues.

The model maintains renormalizability and consistency with known physics.

Abstract

A promising proposal for resolving the cusp-core anomaly in the density profile of dwarf galaxies is to allow dark matter to interact with itself through a light mediator of mass much less than a GeV. The theoretical challenge is to have a complete renormalizable theory where this happens naturally even though dark matter itself may be of the electroweak scale, i.e. 100 GeV to 1 TeV. I propose here such a model, with just two neutral complex scalar singlets under a softly broken dark global U(1) symmetry.