Dark matter in ghost-free bigravity theory: From a galaxy scale to the universe
General Relativity and Quantum Cosmology
2015-01-07 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
We study the origin of dark matter based on the ghost-free bigravity theory with twin matter fluids. The present cosmic acceleration can be explained by the existence of graviton mass, while dark matter is required in several cosmological situations [the galactic missing mass, the cosmic structure formation and the standard big-bang scenario (the cosmological nucleosynthesis vs the CMB observation)]. Assuming that the Compton wavelength of the massive graviton is shorter than a galactic scale, we show the bigravity theory can explain dark matter by twin matter fluid as well as the cosmic acceleration by tuning appropriate coupling constants.
Keywords
Cite
@article{arxiv.1409.0202,
title = {Dark matter in ghost-free bigravity theory: From a galaxy scale to the universe},
author = {Katsuki Aoki and Kei-ichi Maeda},
journal= {arXiv preprint arXiv:1409.0202},
year = {2015}
}
Comments
15 pages, 7 figures, minor changes, references added