http://arxiv.org/abs/1705.08877
We use the most recent cosmic microwave background (CMB) data to perform a Bayesian statistical analysis and discuss the observational viability of inflationary models with a non-minimal coupling $\xi$, between the inflaton field and the Ricci scalar. We particularize our analysis to two examples of small and large field inflationary models, namely, the Coleman-Weinberg and the chaotic quartic potentials. We find that (\textit{i})the $\xi$ parameter is closely correlated with the primordial amplitude; (\textit{ii}) although improving the agreement with the CMB data in the $r – n_s$ plane, where $r$ is the tensor-to-scalar ratio and $n_s$ the primordial spectral index, a non-null coupling is strongly disfavoured with respect to the minimally coupled standard $\Lambda$CDM model.
M. Campista, M. Benetti and J. Alcaniz
Thu, 25 May 17
14/44
Comments: 13 pages,7 figures