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|Title:||CMB and BAO constraints for an induced gravity dark energy model with a quartic potential||Authors:||Umiltà, C.
|Issue Date:||2015||Journal:||JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS||Number:||2015||Issue:||8||First Page:||017||Abstract:||We study the predictions for structure formation in an induced gravity dark energy model with a quartic potential. By developing a dedicated Einstein-Boltzmann code, we study self-consistently the dynamics of homogeneous cosmology and of linear perturbations without using any parametrization. By evolving linear perturbations with initial conditions in the radiation era, we accurately recover the quasi-static analytic approximation in the matter dominated era. We use PLANCK 2013 data and a compilation of baryonic acoustic oscillation (BAO) data to constrain the coupling γ to the Ricci curvature and the other cosmological parameters. By connecting the gravitational constant in the Einstein equation to the one measured in a Cavendish-like experiment, we find γ < 0.0012 at 95% CL with PLANCK 2013 and BAO data. This is the tightest cosmological constraint on γ and on the corresponding derived post-Newtonian parameters. Because of a degeneracy between γ and the Hubble constant H<SUB>0</SUB>, we show how larger values for γ are allowed, but not preferred at a significant statistical level, when local measurements of H<SUB>0</SUB> are combined in the analysis with PLANCK 2013 data. <P />||URI:||http://hdl.handle.net/20.500.12386/23665||ISSN:||1475-7516||DOI:||10.1088/1475-7516/2015/08/017||Bibcode ADS:||2015JCAP...08..017U||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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|1507.00718.pdf||postprint||1.36 MB||Adobe PDF||View/Open|
|P67_UmiltaetAl_CMBBAOConstraints_JCAP08_2015_017.pdf||[administrators only]||1.21 MB||Adobe PDF|
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