Analytic Solution of the Boltzmann Equation in an Expanding System.

@article{Bazow2016AnalyticSO,
  title={Analytic Solution of the Boltzmann Equation in an Expanding System.},
  author={Dennis Bazow and Gabriel S. Denicol and Ulrich Heinz and M. Martinez and Jorge Noronha},
  journal={Physical review letters},
  year={2016},
  volume={116 2},
  pages={
          022301
        }
}
For a massless gas with a constant cross section in a homogeneous, isotropically expanding spacetime we reformulate the relativistic Boltzmann equation as a set of nonlinear coupled moment equations. For a particular initial condition this set can be solved exactly, yielding the first analytical solution of the Boltzmann equation for an expanding system. The nonequilibrium behavior of this relativistic gas can be mapped onto that of a homogeneous, static nonrelativistic gas of Maxwell molecules… 

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