Modified Dark Matter

TL;DR

Modified dark matter (MDM) is a phenomenological model inspired by quantum gravity that explains galaxy rotation curves and cluster masses by linking dark matter profiles to baryonic matter, differing from cold dark matter models.

Contribution

This paper generalizes entropic gravity to de-Sitter space to construct the MDM model and demonstrates its effectiveness in fitting galaxy rotation curves and cluster masses.

Findings

Successfully fits rotation curves of 30 galaxies with a single free parameter.

Achieves agreement between dynamical and observed masses in 93 galactic clusters.

Provides insights on strong gravitational lensing within the MDM framework.

Abstract

Modified dark matter (MDM, formerly known as MoNDian dark matter) is a phenomenological model of dark matter, inspired by quantum gravity. We review the construction of MDM by generalizing entropic gravity to de-Sitter space as is appropriate for an accelerating universe (in accordance with the Lambda-CDM model). Unlike cold dark matter models, the MDM mass profile depends on the baryonic mass. We successfully fit the rotation curves to a sample of 30 local spiral galaxies with a single free parameter (viz., the mass-to-light ratio for each galaxy). We show that dynamical and observed masses agree in a sample of 93 galactic clusters. We also comment on strong gravitational lensing in the context of MDM.