Approximation methods in modified gravity models

Li, Baojiu

Abstract

We review some of the commonly used approximation methods to predict large-scale structure formation in modified gravity (MG) models for the cosmic acceleration. These methods are developed to speed up the often slow N-body simulations in these models, or directly make approximate predictions of relevant physical quantities. In both cases, they are orders of magnitude more efficient than full simulations, making it possible to explore and delineate the large cosmological parameter space. On the other hand, there is a wide variation of their accuracies and ranges of validity, and these are usually not known a priori and must be validated against simulations. Therefore, a combination of full simulations and approximation methods will offer both efficiency and reliability. The approximation methods are also important from a theoretical point of view, since they can often offer useful insight into the nonlinear physics in MG models and inspire new algorithms for simulations.

Citation

Li, B. (2018). Approximation methods in modified gravity models. International Journal of Modern Physics D, 27(15), Article 1848004. https://doi.org/10.1142/s0218271818480048

• Journal Article Type: Article
• Acceptance Date: Jul 9, 2018
• Online Publication Date: Aug 13, 2018
• Publication Date: Dec 1, 2018
• Deposit Date: Dec 14, 2018
• Publicly Available Date: Aug 13, 2019
• Journal: International Journal of Modern Physics D
• Print ISSN: 0218-2718
• Electronic ISSN: 1793-6594
• Publisher: World Scientific Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 27
• Issue: 15
• Article Number: 1848004
• DOI: https://doi.org/10.1142/s0218271818480048