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Title: | Reconstructing teleparallel gravity with cosmic structure growth and expansion rate data |
Authors: | Said, Jackson Mifsud, Jurgen Sultana, Joseph Zarb Adami, Kristian |
Keywords: | General relativity (Physics) Lagrange equations Gaussian processes Perturbation (Astronomy) |
Issue Date: | 2021 |
Publisher: | Institute of Physics Publishing Ltd. |
Citation: | Said, J. L., Mifsud, J., Sultana, J., & Zarb Adami, K. (2021). Reconstructing teleparallel gravity with cosmic structure growth and expansion rate data. Journal of Cosmology and Astroparticle Physics, 2021(06), 015. |
Abstract: | In this work, we use a combined approach of Hubble parameter data together with redshift-space-distortion (fσ8) data, which together are used to reconstruct the teleparallel gravity (TG) Lagrangian via Gaussian processes (GP). The adopted Hubble data mainly comes from cosmic chronometers, while for the Type Ia supernovae data we use the latest jointly calibrated Pantheon compilation. Moreover, we consider two main GP covariance functions, namely the squared-exponential and Cauchy kernels in order to show consistency (to within 1σ uncertainties). The core results of this work are the numerical reconstructions of the TG Lagrangian from GP reconstructed Hubble and growth data. We take different possible combinations of the datasets and kernels to illustrate any potential differences in this regard. We show that nontrivial cosmology beyond ΛCDM falls within the uncertainties om growth data, which therefore indicates no significant departure from the concordance cosmological model. |
URI: | https://www.um.edu.mt/library/oar/handle/123456789/89405 |
Appears in Collections: | Scholarly Works - InsSSA |
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File | Description | Size | Format | |
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Reconstructing_teleparallel_gravity_with_cosmic_structure_growth_and_expansion_rate_data_2021.pdf Restricted Access | 1.53 MB | Adobe PDF | View/Open Request a copy |
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