2017/08/31 by Katsuki Aoki, Shinji Mukohyama
Physics and Astronomy · #Astronomy #Astrophysics #Baryon #Baryonic dark matter #Black Holes and Theoretical Physics #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark fluid #Dark matter #Gravitation #Graviton #Mixed dark matter #Particle physics #Physics #Scalar field dark matter #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.96.104039
published as Phys. Rev. D 96, 104039 (2017) · 13 pages, 6 figures; v2: references added, published version
openalex publication_date 2017/11/22 · arxiv created 2017/12/15 · arxiv updated 2017/12/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We propose a scenario that can naturally explain the observed dark matter-baryon ratio in the context of bimetric theory with a chameleon field. We introduce two additional gravitational degrees of freedom, the massive graviton and the chameleon field, corresponding to dark matter and dark energy, respectively. The chameleon field is assumed to be nonminimally coupled to dark matter, i.e., the massive graviton, through the graviton mass terms. We find that the dark matter-baryon ratio is dynamically adjusted to the observed value due to the energy transfer by the chameleon field. As a result, the model can explain the observed dark matter-baryon ratio independently from the initial abundance of them.