Can $\Lambda$CDM model reproduce MOND-like behavior?
Abstract
It is usually believed that MOND can describe the galactic rotational curves with only baryonic matter and without any dark matter very well, while the CDM model is expected to have difficulty in reproducing MOND-like behavior. Here, we use EAGLE's data to learn whether the CDM model can reproduce MOND-like behavior. EAGLE's simulation result clearly reproduces the MOND-like behavior for at , although the acceleration constant, , is a little larger than the observational data indicate. We find that increases with the redshift in a way different from what Milgrom proposed (). Therefore, while galaxy rotation curves can be fitted by MOND's empirical function in the CDM model, there is no clear connection between and the Hubble constant. We also find that at is well separated from at . Once we have enough galaxies observed at high redshifts, we will be able to rule out the modified gravity model based on MOND-like empirical function with a z-independent .
Keywords
Cite
@article{arxiv.1712.01654,
title = {Can $\Lambda$CDM model reproduce MOND-like behavior?},
author = {De-Chang Dai and Chunyu Lu},
journal= {arXiv preprint arXiv:1712.01654},
year = {2018}
}
Comments
9 figures, accepted by Phys. Rev. D