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With the advant of whole sky surveys of CMB anisotropies and CMB
polarization (e.g. Planck surveyor ) it becomes
interesting to look for lens signal in CMB maps, and more specifically
to look for cross-correlation patterns with weak lensing
surveys. Different strategies have been proposed. Either with the
temperature properties alone,
or with the help of CMB polarization. The idea in this case is that
lens effects induce B-type (magnetic type) polarization which
otherwise would be negligible at small scales (for inflationary models),
These theoretical investigations show that the joint use of CMB maps
and weak lensing surveys should provide us with new constraint on the
vacuum energy density.
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