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Comparison of Einstein-Boltzmann solvers for testing general relativity.

Bellini, E. and Barreira, A. and Frusciante, N. and Hu, B. and Peirone, S. and Raveri, M. and Zumalacárregui, M. and Avilez-Lopez, A. and Ballardini, M. and Battye, R. A. and Bolliet, B. and Calabrese, E. and Dirian, Y. and Ferreira, P. G. and Finelli, F. and Huang, Z. and Ivanov, M. M. and Lesgourgues, J. and Li, B. and Lima, N. A. and Pace, F. and Paoletti, D. and Sawicki, I. and Silvestri, A. and Skordis, C. and Umiltà, C. and Vernizzi, F. (2018) 'Comparison of Einstein-Boltzmann solvers for testing general relativity.', Physical review D., 97 (2). 023520.


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-BransDicke (JBD) gravity, a code that models fðRÞ gravity, a code that models covariant Galileons, a code that models Horava-Lifschitz gravity, and two codes that model nonlocal models of gravity. Comparing ˇ 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.

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Publisher statement:Reprinted with permission from the American Physical Society: 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, E., 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. & Vernizzi, F. (2018). Comparison of Einstein-Boltzmann solvers for testing general relativity. Physical Review D 97(2): 023520 © 2018 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:06 October 2018
Date deposited:08 February 2018
Date of first online publication:22 January 2018
Date first made open access:08 February 2018

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