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The construction of large angular size maps (up to 100 square degrees)
can not be made with N-body simulations specially if a large number
of such maps is needed.
To overcome this problem, it has been proposed to use simplifed
dynamics on the projected density contrast. First the linear theory is
used to build a realistic projected mass maps with Gaussian
statistics. Mode couplings are then introduced with 2nd order
Lagrangian approximation applied to this 2D field. Although this is
not exact, such dynamics induces the same skewness at large scale
(i.e. at leading in Perturbation Theory) so that it sould exhibit most
of the large-scale features we want.
Results obtained with such a method have been described in,
and have been obtained with such maps,
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projected mass map
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shear map
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