The onset of fluid-dynamical behavior in relativistic kinetic theory

Jorge Noronha, Gabriel S. Denicol

Research output: Contribution to journalArticlepeer-review


In this proceedings we discuss recent findings regarding the large order behavior of the Chapman-Enskog expansion in relativistic kinetic theory. It is shown that this series in powers of the Knudsen number has zero radius of convergence in the case of a Bjorken expanding fluid described by the Boltzmann equation in the relaxation time approximation. This divergence stems from the presence of non-hydrodynamic modes, which give non-perturbative contributions to the Knudsen series.

Original languageEnglish (US)
Pages (from-to)417-420
Number of pages4
JournalNuclear Physics A
StatePublished - Nov 2017
Externally publishedYes


  • Bjorken expansion
  • divergent gradient series
  • Relativistic kinetic theory

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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