COLA with scale-dependent growth: applications to screened modified gravity models
Accepted version
Peer-reviewed
Repository URI
Repository DOI
Change log
Authors
Winther, Hans A
Koyama, Kazuya
Manera, Marc
Wright, Bill S
Zhao, Gong-Bo
Abstract
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.
Description
Keywords
5107 Particle and High Energy Physics, 5101 Astronomical Sciences, 51 Physical Sciences
Journal Title
Journal of Cosmology and Astroparticle Physics
Conference Name
Journal ISSN
1475-7516
1475-7516
1475-7516
Volume Title
2017
Publisher
IOP Publishing
Publisher DOI
Sponsorship
Science and Technology Facilities Council (ST/L000636/1)
Science and Technology Facilities Council (ST/P000673/1)
Science and Technology Facilities Council (ST/M007065/1)
Science and Technology Facilities Council (ST/P000673/1)
Science and Technology Facilities Council (ST/M007065/1)