Université de GenèveDépartement de Physique ThéoriqueCAP Genève

What we can learn from the running of the spectral index if no tensors are detected in the cosmic microwave background anisotropy

Topics: 
Date: 
10. February 2015
Cite as: 
M. Biagetti, A. Kehagias, A. Riotto, arXiv: 1502:02289
Summary: 

In this paper we operate under the assumption that no tensors from inflation will be measured in the future by the dedicated experiments and argue that, while for single-field slow-roll models of inflation the running of the spectral index will be hard to be detected, in multi-field models the running can be large due to its strong correlation with non-Gaussianity. A detection of the running

might therefore be related to the presence of more than one active scalar degree of freedom during inflation.

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