Limits to Global Rotation and spin density in Einstein-Cartan Cosmology

Global rotation in the universe is investigated in the context of Einstein-Cartan cosmology. As a first example we compute the global limit to rotation on a flat affine connection teleparallelism, and obtain where ο is the rotation of the model and H₀ is the Hubble constant. Another example is given where the global rotation in the case of a Friedmann universe with torsion. In this example we place limits to global rotation from spin-torsion fluctuations and obtain a lower bound for global rotation of . This value is obtained from a spin-torsion density lower bound of10^-28g²cm^-2s^-2. Both limits are within current results obtained in the literature. Gravitational stability of Friedmann metric is also discussed. All these examples seems to indicate that torsion theories are well within present cosmological observations.