The massless Einstein-Boltzmann system with a conformal-gauge singularity in an FLRW background

preprint2019arXivOpen access

Abstract

We obtain finite-time existence for the massless Boltzmann equation, with a range of soft cross-sections, in an FLRW background with data given at the initial singularity. In the case of positive cosmological constant we obtain long-time existence in proper-time for small data as a corollary.

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