Abstract
ABSTRACT A stochastic adhesion model is introduced, with the purpose of describingthe formation and evolution of mildly nonlinear structures, such as sheets andfilaments, in the intergalacticmedium (IGM), after hydrogen reionization. Themodel is based on replacing the overall force acting on the baryon fluid – as itresults from the composition of local gravity, pressure gradients and Hubbledrag – by a mock external force, self-consistently calculated from first-orderperturbation theory. A small kinematic viscosity term prevents shell-crossingon small scales (which arises because of the approximate treatment of pressuregradients). The emerging scheme is an extension of the well-known adhesionapproximation for the dark matter dynamics, from which it only differs bythe presence of a small-scale ‘random’ force, characterizing the IGM. Ouralgorithm is the ideal tool to obtain the skeleton of the IGM distribution,which is responsible for the structure observed in the low-column density Lyαforest in the absorption spectra of distant quasars.Keywords: Cosmology:theory–intergalacticmedium –large-scalestructureof universe
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