Lawrence Berkeley National Laboratory
hi_class: Horndeski in the Cosmic Linear Anisotropy Solving System
- Author(s): Zumalacárregui, Miguel
- Bellini, Emilio
- Sawicki, Ignacy
- Lesgourgues, Julien
- Ferreira, Pedro G
- et al.
Published Web Locationhttps://doi.org/10.1088/1475-7516/2017/08/019
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.