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Dynamics of minimally coupled dark energy in spherical halos of dark matter. (English) Zbl 1337.83105
Summary: We analyse the evolution of scalar field dark energy in the spherical halos of dark matter at the late stages of formation of gravitationally bound systems in the expanding Universe. The dynamics of quintessential dark energy at the center of dark matter halo strongly depends on the value of effective sound speed $$c_s$$ (in units of speed of light). If $$c_s\sim 1$$ (classical scalar field) then the dark energy in the gravitationally bound systems is only slightly perturbed and its density is practically the same as in cosmological background. The dark energy with small value of sound speed ($$c_s< 0.1$$), on the contrary, is important dynamical component of halo at all stages of their evolution: linear, non-linear, turnaround, collapse, virialization and later up to current epoch. These properties of dark energy can be used for constraining the value of effective sound speed $$c_s$$ by comparison the theoretical predictions with observational data related to the large scale gravitationally bound systems.
##### MSC:
 83F05 Cosmology 85A40 Cosmology 83C75 Space-time singularities, cosmic censorship, etc. 83C25 Approximation procedures, weak fields in general relativity and gravitational theory 83C55 Macroscopic interaction of the gravitational field with matter (hydrodynamics, etc.) 70F15 Celestial mechanics
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