Nonlinear dark matter collapse under diffusion

2014/08/19 by Hermano Velten, Hermano E. S. Velten, Thiago R. P. Caramês · 5 citations
Physics and Astronomy · #Advanced Thermodynamics and Statistical Mechanics #Astrophysics #Classical mechanics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark fluid #Dark matter #Diffusion #Galaxies: Formation, Evolution, Phenomena #Nonlinear system #Perturbation (astronomy) #Physics #Quantum mechanics #Statistical physics #astro-ph.CO #hep-th

paper · pdf · doi:10.1103/physrevd.90.063524

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 90(6) (American Physical Society) · 6 pages, 9 figures

arxiv created 2014/08/19 · openalex publication_date 2014/09/24 · arxiv updated 2014/09/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Diffusion is one of the physical processes allowed for describing the large scale dark matter dynamics. At the same time, it can be seen as a possible mechanism behind the interacting cosmologies. We study the nonlinear spherical ``top-hat'' collapse of dark matter which undergoes velocity diffusion into a solvent dark energy field. We show constraints on the maximum magnitude allowed for the dark matter diffusion. Our results reinforce previous analysis concerning the linear perturbation theory.

Citations

• Impact of dark energy perturbations on the growth index
• Dynamical mutation of dark energy

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• On the implementation of the spherical collapse model for dark energy models
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