  It is shown that rotational cosmological perturbations can be generated in
the early Universe, similarly to gravitational waves. The generating mechanism
is quantum-mechanical in its nature, and the created perturbations should now
be placed in squeezed vacuum quantum states. The physical conditions under
which the phenomenon can occur are formulated. The generated perturbations can
contribute to the large-angular-scale anisotropy of the cosmic microwave
background radiation. An exact formula is derived for the angular correlation
function of the temperature variations caused by the quantum-mechanically
generated rotational perturbations. The multipole expansion begins from the
dipole component. The comparison with the case of gravitational waves is made.
