Preprint Article Version 1 This version is not peer-reviewed

Non-Standard Hierarchies of the Runnings of the Spectral Index in Inflation

Version 1 : Received: 30 January 2017 / Approved: 31 January 2017 / Online: 31 January 2017 (11:05:37 CET)

A peer-reviewed article of this Preprint also exists.

Longden, C. Non-Standard Hierarchies of the Runnings of the Spectral Index in Inflation. Universe 2017, 3, 17. Longden, C. Non-Standard Hierarchies of the Runnings of the Spectral Index in Inflation. Universe 2017, 3, 17.

Journal reference: Universe 2017, 3, 17
DOI: 10.3390/universe3010017

Abstract

Recent analyses of cosmic microwave background surveys have revealed hints that there may be a non-trivial running of the running of the spectral index. If future experiments were to confirm these hints, it would prove a powerful discriminator of inflationary models, ruling out simple single field models. We discuss how isocurvature perturbations in multi-field models can be invoked to generate large runnings in a non-standard hierarchy, and find that a minimal model capable of practically realising this would be a two-field model with a non-canonical kinetic structure. We also consider alternative scenarios such as variable speed of light models and canonical quantum gravity effects and their implications for runnings of the spectral index.

Subject Areas

early universe cosmology; testing inflation; multi-field inflation

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