title: Analytic Solution of the Boltzmann Equation in an Expanding System.
abstract: 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.
authors.affiliation: Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: D
authors.initials: D
authors.lastname: Bazow
authors.affiliation: Department of Physics, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8, Canada.|Physics Department, Brookhaven National Lab, Building 510A, Upton, New York 11973, USA.
authors.forename: G S
authors.initials: GS
authors.lastname: Denicol
authors.affiliation: Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: U
authors.initials: U
authors.lastname: Heinz
authors.affiliation: Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.
authors.forename: M
authors.initials: M
authors.lastname: Martinez
authors.affiliation: Instituto de Física, Universidade de São Paulo, C.P. 66318, 05315-970 São Paulo, São Paulo, Brazil.|Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027, USA.
authors.forename: J
authors.initials: J
authors.lastname: Noronha