2019/11/30 by Jiaming Shi, Taishi Katsuragawa, Taotao Qiu · 2 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark fluid #Dark matter #Dark matter halo #Galaxy #Galaxy rotation curve #Geophysics and Gravity Measurements #Halo #Hot dark matter #Mathematical physics #Physics #Scalar field #Scalar field dark matter #Solar and Space Plasma Dynamics #Warm dark matter #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.101.024046
published in Physical review. D/Physical review. D. 101(2) (American Physical Society) · 25 pages,revtex4-1
openalex created_date 2019/11/22 · openalex publication_date 2020/01/23 · arxiv created 2020/10/12 · arxiv updated 2020/10/13 · openalex updated_date 2026/08/05
We study spherically symmetric solutions with a scalar field in the shift-symmetric subclass of the Horndeski theory. Constructing an effective energy-momentum tensor of the scalar field based on the two-fluid model, we decompose the scalar field into two components: dark matter and dark energy. We find the dark-matter fluid is pressureless, and its distribution of energy density obeys the inverse-square law. We show the scalar field dark matter can explain the galaxy rotation curve and discuss the time evolution of the dark matter in the cosmic background.