String fluid dynamical models in the Einstein-Cartan theory

Abstract

Using the general, energy-momentum tensor for a dynamical, string fluid developed from the Ray-Hilbert variational principle, physically motivated applications to Riemann-Cartan spacetime are given within the framework of the Einstein-Cartan theory. The string density is considered for the cases when it is or is not a thermodynamical variable of the fluid. Solutions are given for both cases and compared with other models in both general relativity and the Einstein-Cartan theory. The use of a string fluid as a contributer to galactic halo density is also discussed.