A comparison of Einstein-Boltzmann solvers for testing General Relativity

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...

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Bibliographic Details
Published in:arXiv.org 2017-12
Main Authors: Bellini, E, Barreira, A, Frusciante, N, B Hu, Peirone, S, Raveri, M, Zumalacárregui, M, Avilez-Lopez, A, Ballardini, M, Battye, R A, Bolliet, B, Calabrese, E, Dirian, Y, Ferreira, P G, Finelli, F, Huang, Z, Ivanov, M M, Lesgourgues, J, B Li, Lima, N A, Pace, F, Paoletti, D, Sawicki, I, Silvestri, A, Skordis, C, Umiltà, C, Vernizzi, F
Format: Article
Language:English
Subjects:
Big Bang theory
Codes
Cosmic microwave background
Dark matter
Gravitation
Mathematical models
Parameters
Relativity
Solvers
Tensors
Theory of relativity
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Summary: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 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1709.09135