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We compare Einstein-Boltzmann solvers that include modifications to GeneralRelativity and find that, for a wide range of models and parameters, they agreeto a high level of precision. We look at three general purpose codes thatprimarily model general scalar-tensor theories, three codes that modelJordan-Brans-Dicke (JBD) gravity, a code that models f(R) gravity, a code thatmodels covariant Galileons, a code that models Ho\v{r}ava-Lifschitz gravity andtwo codes that model non-local models of gravity. Comparing predictions of theangular power spectrum of the cosmic microwave background and the powerspectrum of dark matter for a suite of different models, we find agreement atthe sub-percent level. This means that this suite of Einstein-Boltzmann solversis now sufficiently accurate for precision constraints on cosmological andgravitational parameters.

A comparison of Einstein-Boltzmann solvers for testing General Relativity