Cosmology with a dynamically screened scalar interaction in the dark sector

TL;DR

This paper explores a modified cosmological model where dark matter experiences a screened scalar force, affecting structure formation by expelling dark matter halos from voids, inspired by string theory.

Contribution

It introduces a novel LambdaCDM extension with a long-range scalar interaction in dark matter, demonstrating its impact on cosmic structure formation.

Findings

Dark matter halos are expelled from voids due to scalar forces.

Scalar interactions influence the distribution of dark matter in the universe.

The model offers new insights into structure formation mechanisms.

Abstract

Motivated in part by string theory, we consider a modification of the LambdaCDM cosmological model in which the dark matter has a long-range scalar force screened by light particles. Scalar forces can have interesting effects on structure formation: the main example presented here is the expulsion of dark matter halos from low density regions, or voids, in the galaxy distribution.