Bellini, EmilioBarreira, A.Frusciante, N.Ballardini, M.2018-03-012018-03-012018Bellini, E. et al. (2018). A comparison of Einstein-Boltzmann solvers for testing General Relativity. Physical Review D, 97: 0235202470-0010http://dx.doi.org/10.1103/PhysRevD.97.023520http://hdl.handle.net/10566/3559We 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.enThis is the pre-print version (From arXiv:1709.09135) of teh article published online at: http://dx.doi.org/10.1103/PhysRevD.97.023520General RelativityEinstein-Boltzmann solversscalar-tensor theoriesA comparison of Einstein-Boltzmann solvers for testing General RelativityArticle