Dark matter candidate induced by Horndeski theory: dark matter halo and cosmological evolution
arXiv:1911.04741 · doi:10.1103/PhysRevD.101.024046
Abstract
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 pressure-less, 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.
arXiv comment25 pages,revtex4-1
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