Article
Version 1
Preserved in Portico This version is not peer-reviewed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.
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.
Keywords
early universe cosmology; testing inflation; multi-field inflation
Subject
Physical Sciences, Particle and Field Physics
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Comments (0)
We encourage comments and feedback from a broad range of readers. See criteria for comments and our Diversity statement.
Leave a public commentSend a private comment to the author(s)
* All users must log in before leaving a comment
