Torsion as a source of expansion in a Bianchi typeI universe in the selfconsistent EinsteinCartan theory of a perfect fluid with spin density
Abstract
We show that a generalized (or ``power law'') inflationary phase arises naturally and inevitably in a simple (Bianchi typeI) anisotropic cosmological model in the selfconsistent EinsteinCartan gravitation theory with the improved stressenergymomentum tensor with the spin density of Ray and Smalley. This is made explicit by an analytical solution of the field equations of motion of the fluid variables. The inflation is caused by the angular kinetic energy density due to spin. The model further elucidates the relationship between fluid vorticity, the angular velocity of the inertially dragged tetrads, and the precession of the principal axes of the shear ellipsoid. Shear is not effective in damping the inflation.
 Publication:

Physical Review D
 Pub Date:
 April 1987
 DOI:
 10.1103/PhysRevD.35.2302
 Bibcode:
 1987PhRvD..35.2302B
 Keywords:

 Big Bang Cosmology;
 Cartan Space;
 Ideal Fluids;
 Relativity;
 Self Consistent Fields;
 Torsion;
 Anisotropic Media;
 Astronomical Models;
 Energy Distribution;
 Kinetic Energy;
 Spin Dynamics;
 Universe;
 Astrophysics;
 04.50.+h;
 98.80.Dr;
 Gravity in more than four dimensions KaluzaKlein theory unified field theories;
 alternative theories of gravity