Abstract
The effect of cosmological tidal shear on the structure and kinematics of dark halos is examined using N-body simulations of the collapse of density peaks in the cold dark matter model. The origin of the triaxial nature of dark halos is investigated by comparing the shapes of the density peaks to the shapes of dark halos. Dark halos are generally flatter than their progenitor density perturbations. The shape distribution of dark halos depends strongly on the strength and orientation of the tidal shear field. The kinematics are studied using measurements of angular momentum, streaming motions, tumbling, and velocity ellipsoids of the dark halos
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