Interacting Constituents in Cosmology
arXiv:0705.1369 · doi:10.1142/S0218271808012541
Abstract
Universe evolution, as described by Friedmann's equations, is determined by source terms fixed by the choice of pressure energy-density equations of state . The usual approach in Cosmology considers equations of state accounting only for kinematic terms, ignoring the contribution from the interactions between the particles constituting the source fluid. In this work the importance of these neglected terms is emphasized. A systematic method, based on the Statistical Mechanics of real fluids, is proposed to include them. A toy-model is presented which shows how such interaction terms can engender significant cosmological effects.
24 pages, 6 figures. It includes results presented in "Cosmic Acceleration from Elementary Interactions" [arXiv:gr-qc/0512135]. Citations added in v.2