W. Zimdahl et Ab. Balakin, KINETIC-THEORY FOR NONGEODESIC PARTICLE MOTION - SELF-INTERACTING EQUILIBRIUM STATES AND EFFECTIVE VISCOUS-FLUID PRESSURES, Classical and quantum gravity (Print), 15(10), 1998, pp. 3259-3270
The particles of a classical relativistic gas are assumed to move unde
r the influence of a quasilinear tin the particle 4-momenta), self-int
eracting force in between elastic, binary collisions. This force, whic
h is completely fixed by the equilibrium conditions of the gas, gives
rise to an effective viscous pressure on the quid phenomenological lev
el. Earlier results concerning the possibility of accelerated expansio
n of the universe due to cosmological particle production are reinterp
reted. A phenomenon such as power-law inflation may be traced back to
specific self-interacting forces keeping the particles of a gas univer
se in states of generalized equilibrium.