Baryon-photon interactions in Resummed Kinetic Field Theory

Abstract

We explore how interactions between baryons and photons can be incorporated into Kinetic Field Theory (KFT), a description of cosmic structure formation based on classical Hamiltonian particle dynamics. In KFT, baryons are described as effective mesoscopic particles which represent fluid elements governed by the hydrodynamic equations. In this paper, we modify the mesoscopic particle model to include pressure effects exerted on baryonic matter through interactions with photons. As a proof of concept, we use this extended mesoscopic model to describe the tightly coupled baryon-photon fluid between matter-radiation equality and recombination. We show that this model can qualitatively reproduce the formation of baryon-acoustic oscillations in the cosmological power spectrum.

16 pages, 3 figures

References in corpus (7)

• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Resumming Cosmological Perturbations via the Lagrangian Picture: One-loop Results in Real Space and in Redshift Space
• The IR-resummed Effective Field Theory of Large Scale Structures
• Large-scale structure perturbation theory without losing stream crossing
• Trajectories of point particles in cosmology and the Zel'dovich approximation
• A first comparison of Kinetic Field Theory with Eulerian Standard Perturbation Theory
• Resummed Kinetic Field Theory: a model of coupled baryonic and dark matter