How to simulate the Universe in a box? Testing modified gravity with a N-body simulation code

TL;DR

This paper presents preliminary cosmological simulations of modified gravity, demonstrating improved low-mass halo abundance and small differences in large-scale power spectra compared to standard cold dark matter models.

Contribution

It introduces a simulation approach for testing modified gravity theories and compares their predictions with standard cosmology.

Findings

Modified gravity models better fit low-mass halo observations.

Differences in large-scale power spectra are minimal.

Modified gravity shows potential to explain certain cosmological features.

Abstract

In this paper we present preliminary results from cosmological simulations of modified gravity in the dark matter sector. Our results show improvements over standard cold dark matter cosmology. The abundance of low-mass haloes in the modified gravity model fit observations better than the conventional theory, while the differences of the modified density fluctuation power spectrum differs from the standard, $\Lambda$CDM power spectrum are small enough to make these two models observationally indistinguishable at large scales.