2019/07/24 by Stefan Floerchinger, Mathias Garny, Aris Katsis +3
Physics and Astronomy · #Bispectrum #Cosmological perturbation theory #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Effective action #Galaxies: Formation, Evolution, Phenomena #Inverse #Mathematical physics #Particle physics #Perturbation theory (quantum mechanics) #Physics #Propagator #Quantum electrodynamics #Quantum mechanics #Spectral density #Statistics #Wavenumber #astro-ph.CO #hep-ph
paper · pdf · doi:10.1088/1475-7516/2019/09/047
24 pages, 9 figures
arxiv created 2019/07/24 · openalex publication_date 2019/09/23 · arxiv updated 2019/10/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Dark matter evolution during the process of cosmological structure formation can be described in terms of a one-particle irreducible effective action at a characteristic scale k m and a loop expansion below this scale, based on the effective propagators and vertices. We calculate the form of the effective vertices and compute the bispectrum of density perturbations within a one-loop approximation. We find that the effective vertices play a subdominant role as compared to the effective viscosity and sound velocity that modify the (inverse) propagators. For the bispectrum we reproduce the results of standard perturbation theory in the range where it is applicable, and find a slightly improved agreement with N -body simulations at larger wavenumbers.