Einstein-Cartan cosmology and the CMB anisotropies

Abstract

We derive linear scalar perturbation equations for Einstein-Cartan field equations of Weyssenhoff fluid, as well as for the corresponding perturbations of Bianchi identity and geodesic equations. The equations are given in both conformal Newtonian and synchronous gauges. They are suitable for numerical implementation when precise evolution of torsion and its perturbation will be extracted from N-body cosmic simulations of the large scale structures in the Universe. A rising number of problems of the concordance cosmological model forces us to include the rotational degrees of freedom realized through torsion in the Einstein-Cartan gravity.