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Open Access Publications from the University of California

Hi-class: Horndeski in the Cosmic Linear Anisotropy Solving System

  • Author(s): Zumalacárregui, M
  • Bellini, E
  • Sawicki, I
  • Lesgourgues, J
  • Ferreira, PG
  • et al.

© 2017 IOP Publishing Ltd and Sissa Medialab. We present the public version of hi-class (, 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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