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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. 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. Umiltą, F. Vernizzi

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.

Astrophysics - Cosmology and Nongalactic Astrophysics

Physical Review D
Volume 97, Issue 2
2018 January

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia