2017/03/31 by Hans A. Winther, K. Koyama, Kazuya Koyama +4 · 93 citations
Physics and Astronomy · #Acceleration #Black Holes and Theoretical Physics #Classical mechanics #Cola (plant) #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #Gravitation #Lagrangian #Particle physics #Perturbation (astronomy) #Perturbation theory (quantum mechanics) #Physics #Quantum mechanics #Scale (ratio) #Statistical physics #Theoretical physics #astro-ph.CO #gr-qc
paper · pdf · doi:10.1088/1475-7516/2017/08/006
published in Journal of Cosmology and Astroparticle Physics 2017(08), 006 (Institute of Physics) · 31 pages, 11 figures. The code can be found at https://github.com/HAWinther/MG-PICOLA-PUBLIC
arxiv created 2017/07/19 · openalex publication_date 2017/08/03 · arxiv updated 2017/08/09 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05
We present a general parallelized and easy-to-use code to perform numerical simulations of structure formation using the COLA (COmoving Lagrangian Acceleration) method for cosmological models that exhibit scale-dependent growth at the level of first and second order Lagrangian perturbation theory. For modified gravity theories we also include screening using a fast approximate method that covers all the main examples of screening mechanisms in the literature. We test the code by comparing it to full simulations of two popular modified gravity models, namely f ( R ) gravity and nDGP, and find good agreement in the modified gravity boost-factors relative to ΛCDM even when using a fairly small number of COLA time steps.