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Comparison of Einstein-Boltzmann solvers for testing general relativity

E. Bellini, A. Barreira, N. Frusciante, B. Hu, S. Peirone, M. Raveri, M. Zumalacįrregui, A. Avilez-Lopez, M. Ballardini, R. Battye, B. Bolliet, E. Calabrese, Y. Dirian, P. 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. Umiltą, F. Vernizzi

Abstract
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 Hořava-Lifschitz gravity, and two codes that model nonlocal 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 subpercent level. This means that this suite of Einstein-Boltzmann solvers is now sufficiently accurate for precision constraints on cosmological and gravitational parameters.

Keywords
Astrophysics - Cosmology and Nongalactic Astrophysics

Physical Review D
Volume 97, Issue 2
2018 January

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Instituto de AstrofĆ­sica e CiĆŖncias do EspaƧo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
FundaĆ§Ć£o para a CiĆŖncia e a Tecnologia COMPETE 2020 PORTUGAL 2020 UniĆ£o Europeia