  The high-temperature phase of SU(2) Yang-Mills theory is addressed by means
of dimensional reduction with a special emphasis on the properties of center
vortices. For this purpose, the vortex vacuum which arises from center
projection is studied in pure 3-dimensional Yang-Mills theory as well as in the
3-dimensional adjoint Higgs model which describes the high temperature phase of
the 4-dimensional SU(2) gauge theory. We find center-dominance within the
numerical accuracy of 10%.
