hi_class: Horndeski in the cosmic linear anisotropy solving system

Journal article

We present the public version of hi-class (www.hiclass-code.net), an extension of the Boltzmann code CLASS to a broad ensemble of modifications to general relativity. In particular, hi-class can calculate predictions for models based on Horndeski's theory, which is the most general scalar-tensor theory described by second-order equations of motion and encompasses any perfect-fluid dark energy, quintessence, Brans-Dicke, f(R) and covariant Galileon models. hi-class has been thoroughly tested and can be readily used to understand the impact of alternative theories of gravity on linear structure formation as well as for cosmological parameter extraction.

Authors: Zumalacárregui, M; Bellini, E; Sawicki, I; Lesgourgues, J; Ferreira, P

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Institute of Physics
• Journal: Journal of Cosmology and Astroparticle Physics
• Volume: 2017
• Issue: 08
• Pages: 019
• Publication date: 2017-08-16
• Acceptance date: 2017-07-23
• DOI: 10.1088/1475-7516/2017/08/019
• EISSN: 1475-7516
• Keywords: EFT of DE; Horndeski; modified gravity; dark energy theory; cosmological parameters from CMBR; dark energy; cosmological parameters from LSS; public Boltzmann code; scalar-tensor; cosmology