A comparison of Einstein-Boltzmann solvers for testing General Relativity
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 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.
Cite
@article{arxiv.1709.09135,
title = {A comparison of Einstein-Boltzmann solvers for testing General Relativity},
author = {E. Bellini and A. Barreira and N. Frusciante and B. Hu and S. Peirone and M. Raveri and M. Zumalacárregui and A. Avilez-Lopez and M. Ballardini and R. A. Battye and B. Bolliet and E. Calabrese and Y. Dirian and P. G. Ferreira and F. Finelli and Z. Huang and M. M. Ivanov and J. Lesgourgues and B. Li and N. A. Lima and F. Pace and D. Paoletti and I. Sawicki and A. Silvestri and C. Skordis and C. Umiltà and F. Vernizzi},
journal= {arXiv preprint arXiv:1709.09135},
year = {2018}
}
Comments
23 pages; 11 figures. Matches version accepted in PRD