A comparison of Einstein-Boltzmann solvers for testing General Relativity
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Date
2018Author
Bellini, Emilio
Barreira, A.
Frusciante, N.
Ballardini, M.
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We compare Einstein-Boltzmann solvers that include modifications to General Relativity and find that, for a
wide range of models and parameters, they agree to a high level of precision. We look at three general purpose
codes that primarily model general scalar-tensor theories, three codes that model Jordan-Brans-Dicke (JBD)
gravity, a code that models f (R) gravity, a code that models covariant Galileons, a code that models Hoˇrava-
Lifschitz gravity and two codes that model non-local models of gravity. Comparing predictions of the angular
power spectrum of the cosmic microwave background and the power spectrum of dark matter for a suite of
different models, we find agreement at the sub-percent level. This means that this suite of Einstein-Boltzmann
solvers is now sufficiently accurate for precision constraints on cosmological and gravitational parameters.