Resummed Kinetic Field Theory: Using Mesoscopic Particle Hydrodynamics to Describe Baryonic Matter in a Cosmological Framework

Abstract

Recently, Bartelmann et al. presented a 'Kinetic Field Theory' (KFT) formalism to tackle the difficulties of large scale structure formation. In this approach, the dynamics of a non-equilibrium ensemble of classical particles are examined based on methods of statistical field theory. So far, only contributions coming from dark matter were considered, which is assumed to pose an accurate description of our universe on very large scales. Nevertheless, going to smaller scales, also baryonic contributions have to be taken into account. Building on the ideas of Viermann et al. we present an effective particle model of hydrodynamics to describe baryonic matter in a cosmological framework. Using this model, the baryonic density contrast power spectrum is computed to lowest perturbative order within the resummed KFT framework of Lilow et al. We discuss the qualitative differences to the dark matter case and perform a quantitative comparison to the baryonic spectrum obtained from Eulerian perturbation theory. A subsequent paper will resolve the problem of coupling both theories describing dark and baryonic matter, respectively, to gain a full model of cosmic matter. Even though our focus is on cosmological systems only, we want to emphasize that all methods presented here are of a quite general fashion, making it applicable also to other fields.

arXiv comment24 pages, 2 figures, current version: added more explanatory material (especially on the underlying RKFT-formalism), added references to literature on non-linear structure formation, make difference to pure dark matter model clearer, further minor changes; content matches published version

References in corpus (29)

• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Large-Scale Structure of the Universe and Cosmological Perturbation Theory
• The Effective Field Theory of Cosmological Large Scale Structures
• Renormalized Cosmological Perturbation Theory
• Resumming Cosmological Perturbations via the Lagrangian Picture: One-loop Results in Real Space and in Redshift Space
• Effects of Baryons and Dissipation on the Matter Power Spectrum
• Memory of Initial Conditions in Gravitational Clustering
• The IR-resummed Effective Field Theory of Large Scale Structures
• The Lagrangian-space Effective Field Theory of Large Scale Structures
• Resumming Cosmic Perturbations
• Cosmological perturbation theory at three-loop order
• Coarse-Grained Cosmological Perturbation Theory
• A new approach to gravitational clustering: a path-integral formalism and large-N expansions
• The growth of structure in the intergalactic medium
• Third-order Perturbation Theory With Non-linear Pressure
• How closely do baryons follow dark matter on large scales?
• Nonlinear Power Spectrum from Resummed Perturbation Theory: a Leap Beyond the BAO Scale
• A microscopic, non-equilibrium, statistical field theory for cosmic structure formation
• Fundamental Theory of Statistical Particle Dynamics
• Field Theoretic Formulation of Kinetic theory: I. Basic Development
• Newtonian Kinetic Theory and the Ergodic-Nonergodic Transition
• Analytic solutions for coupled linear perturbations
• A new approach to cosmological structure formation with massive neutrinos
• Smoluchowski dynamics and the ergodic-nonergodic transition
• Trajectories of point particles in cosmology and the Zel'dovich approximation
• Accurate initial conditions in mixed Dark Matter--Baryon simulations
• Kinetic Field Theory: Effects of momentum correlations on the cosmic density-fluctuation power spectrum
• Resummed Kinetic Field Theory: general formalism and linear structure growth from Newtonian particle dynamics
• Kinetic Field Theory: Exact free evolution of Gaussian phase-space correlations

Cited by in corpus (6)

• Cosmic Structure Formation with Kinetic Field Theory
• Cosmological perturbations for two cold fluids in $\Lambda$CDM
• Kinetic Field Theory for Cosmic Structure Formation
• Field-theoretic approach to large-scale structure formation
• Resummed Kinetic Field Theory: a model of coupled baryonic and dark matter
• Baryon-photon interactions in Resummed Kinetic Field Theory