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Dark matter in Horndeski theory

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KMI Topics
2019-01-17 17:00
Shi Jiaming (Central China Normal University)
KMI Science Symposia (ES635)
Dark matter in Horndeski theory
Shi Jiaming (Central China Normal University)
January 17, 2019 (Thu) 17:00-
KMI Science Symposia (ES635)
Abstract:

Horndeski theory is the most general scalar-tensor theory which leads to the second-order equations of motion. In this talk, a subclass of the Horndeski theory with shift symmetry is applied to study the galaxy rotation curve and the cosmo- logical evolution with identifying the scalar field with the dark matter, while the cosmological constant explains the dark energy. I show an analytic solution which reproduces the inverse-square-law density distribution of dark matter halo, so that the observed rotation curve can be explained at the galactic scale. I also discuss the dark-matter-like behavior of the scalar field at the cosmological scale and consider the consistent parameter region between the galactic and cosmological scales.