Comparison of Einstein-Boltzmann solvers for testing general relativity

Bellini, E., Barreira, A., Frusciante, N., Hu, B., Peirone, S., Raveri, M., Zumalacárregui, M., Avilez-Lopez, A., Ballardini, M., Battye, R. A., Bolliet, B., Calabrese, Erminia ORCID: https://orcid.org/0000-0003-0837-0068, Dirian, Y., Ferreira, P. G., Finelli, F., Huang, Z., Ivanov, M. M., Lesgourgues, J., Li, B., Lima, N. A., Pace, F., Paoletti, D., Sawicki, I., Silvestri, A., Skordis, C., Umiltà, C. and Vernizzi, F. 2017. Comparison of Einstein-Boltzmann solvers for testing general relativity. Physical Review D 97 , 023520. 10.1103/PhysRevD.97.023520

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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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	2470-0010
Date of First Compliant Deposit:	19 December 2017
Date of Acceptance:	8 December 2017
Last Modified:	05 May 2023 07:40
URI:	https://orca.cardiff.ac.uk/id/eprint/107653

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