hi_class: Horndeski in the Cosmic Linear Anisotropy Solving System
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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.
Abstract

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.

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