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http://hdl.handle.net/20.500.12386/23665
Titolo: | CMB and BAO constraints for an induced gravity dark energy model with a quartic potential | Autori: | Umiltà, C. Ballardini, M. FINELLI, FABIO PAOLETTI, DANIELA |
Data pubblicazione: | 2015 | Rivista: | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | Numero: | 2015 | Fascicolo: | 8 | Da pagina:: | 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 |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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P67_UmiltaetAl_CMBBAOConstraints_JCAP08_2015_017.pdf | [administrators only] | 1.21 MB | Adobe PDF |
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