Аннотация
The existence of a cosmic neutrino background has been inferred indirectly
from cosmological surveys through its effect on the linear-theory evolution of
primordial density perturbations, as well as from measurements of the
primordial abundances of light elements. Constraints on the masses of the three
neutrino species imply that at least two of them move non-relativistically
today. As a consequence, non-linear evolution of density perturbations results
in the formation of neutrino halos around dark-matter halos. We study whether
these neutrino halos can be detected in the foreseeable future through
measurements of weak gravitational lensing of the cosmic microwave background,
thus providing, possibly, the first beyond-linear-theory signature of cosmic
neutrinos.
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