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2014

A model-independent fit to Planck and BICEP2 data

Barranco, Laura, Boubekeur, Lotfi, Mena, Olga

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Inflation is the leading theory to describe elegantly the initial conditions that led to structure formation in our universe.

In this paper, we present a novel phenomenological fit to the Planck, WMAP polarisation (WP) and the BICEP2 datasets using an alternative parameterisation.
Instead of starting from inflationary potentials and computing the inflationary observables, we use a phenomenological parameterisation due to Mukhanov, describing inflation by an effective equation-of-state, in terms of the number of e-folds and two phenomenological parameters $\alpha$ and $\beta$.
Within such a parametrisation, which captures the different inflationary models in a model-independent way, the values of the scalar spectral index $n_s$, its running and the tensor-to-scalar ratio $r$ are predicted, given a set of parameters $(\alpha,\beta)$.

A model-independent fit to Planck and BICEP2 data · Around

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