Regular Article - Theoretical Physics
Van der Waals universe with adiabatic matter creation
School of Mathematical Sciences, Technological University Dublin, Kevin Street Campus, Dublin 8, Ireland
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Accepted: 18 January 2019
Published online: 6 February 2019
A FRWL cosmological model with perfect fluid comprising of van der Waals gas and dust has been studied in the context of dynamical analysis of a three-component autonomous non-linear dynamical system for the particle number density n, the Hubble parameter H, and the temperature T. Perfect fluid isentropic particle creation at rate proportional to an integer power of H has been incorporated. The existence of a global first integral allows the determination of the temperature evolution law and hence the reduction of the dynamical system to a two-component one. Special attention is paid to the cases of and and these are illustrated with numerical examples. The global dynamics is comprehensively studied for different choices of the values of the physical parameters of the model. Trajectories in the (n, H) phase space are identified for which temporary inflationary regime exists.
© The Author(s), 2019