Observational tests of Gauss-Bonnet like dark energy model
Department of Physics, Faculty of Science, Bu-Ali Sina University, 65178, Hamedan, Iran
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Accepted: 14 April 2019
Published online: 7 June 2019
The consistency of some dynamical dark energy models based on the Gauss-Bonnet invariant, , is studied compared with cosmological observational tests. The investigated models are modified forms of Gauss-Bonnet dark energy, MGB-DE and two other versions which are interacting, MGB and MGB. The energy density of the proposed models is a combination of powers of the Hubble rate, H, and its time derivative. To investigate the performance of MGB dark energy models, we have used data analyzing methods and numerical solutions, at both background and perturbed levels, based on recent observational data from SNIa, baryon acoustic oscillations (BAO), Hubble parameter, CMB data, and structure formation data surveys. Employing joint data sets and comparing the results to those of LCDM, we show that all versions of MGB-DE predict the expansion history and evolution of structures as well as CDM appropriately. If we use a pure late universe dataset, we see that all models of MGB-DE are successful in the recent epoch, and there is no significant evidence against or in favor of CDM whereas, for the early universe, statistical results indicate a significantly better agreement for CDM as compared to all versions of MGB-DE models.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2019