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A comparison of Einstein-Boltzmann solvers for testing General Relativity

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arxiv 1709.09135 v2 pith:7WAFH7E7 submitted 2017-09-26 astro-ph.CO

E. Bellini , A. Barreira , N. Frusciante , B. Hu , S. Peirone , M. Raveri , M. Zumalacárregui , A. Avilez-Lopez
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M. Ballardini R. A. Battye B. Bolliet E. Calabrese Y. Dirian P. G. Ferreira F. Finelli Z. Huang M. M. Ivanov J. Lesgourgues B. Li N. A. Lima F. Pace D. Paoletti I. Sawicki A. Silvestri C. Skordis C. Umiltà F. Vernizzi
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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 Ho\v{r}ava-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.

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