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Comparison of Einstein-Boltzmann solvers for testing general relativity

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    0501990 - FZÚ 2019 RIV US eng J - Journal Article
    Bellini, E. - Barreira, A. - Frusciante, N. - Hu, B. - Peirone, S. - Raveri, M. - Zumalacarregui, 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, Ignacy - Silvestri, A. - Skordis, Constantinos - Umilta, C. - Vernizzi, F.
    Comparison of Einstein-Boltzmann solvers for testing general relativity.
    Physical Review D. Roč. 97, č. 2 (2018), s. 1-29, č. článku 023520. ISSN 2470-0010. E-ISSN 2470-0029
    R&D Projects: GA MŠMT EF15_003/0000437
    Grant - others:OP VVV - CoGraDS(XE) CZ.02.1.01/0.0/0.0/15_003/0000437
    Institutional support: RVO:68378271
    Keywords : alternative gravity theories * cosmic microwave background * cosmological parameters * dark energy
    OECD category: Astronomy (including astrophysics,space science)
    Impact factor: 4.368, year: 2018

    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.
    Permanent Link: http://hdl.handle.net/11104/0293953

     
     
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