The present and future of the most favoured inflationary models after $Planck$ 2015

Abstract

The value of the tensor-to-scalar ratio $r$ in the region allowed by the latest $Planck$ 2015 measurements can be associated to a large variety of inflationary models. We discuss here the potential of future Cosmic Microwave Background cosmological observations in disentangling among the possible theoretical scenarios allowed by our analyses of current $Planck$ temperature and polarization data. Rather than focusing only on $r$, we focus as well on the running of the primordial power spectrum, ${\alpha }_s$ and the running of thereof, ${\beta }_s$. Our Fisher matrix method benefits from a detailed and realistic appraisal of the expected foregrounds. Future cosmological probes, as the COrE mission, may be able to reach an unprecedented accuracy in the extraction of ${\beta }_s$ and rule out the most favoured inflationary models.

Accepted to appear in JCAP (originally submitted 19 September, 2015). 13 pages and 4 figues

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