Strongly scale-dependent CMB dipolar asymmetry from super-curvature fluctuations

Byrnes, Christian, Domènech, Guillem, Sasaki, Misao and Takahashi, Tomo (2016) Strongly scale-dependent CMB dipolar asymmetry from super-curvature fluctuations. Journal of Cosmology and Astroparticle Physics, 2016 (12). 020. ISSN 1475-7516

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Abstract

We reconsider the observed CMB dipolar asymmetry in the context of open inflation, where a supercurvature mode might survive the bubble nucleation. If such a supercurvature mode modulates the amplitude of the curvature power spectrum, it would easily produce an asymmetry in the power spectrum. We show that current observational data can be accommodated in a three-field model, with simple quadratic potentials and a non-trivial field-space metric. Despite the presence of three fields, we believe this model is so far the simplest that can match current observations. We are able to match the observed strong scale dependence of the dipolar asymmetry, without a fine tuning of initial conditions, breaking slow roll or adding a feature to the evolution of any field.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Astronomy Centre
Subjects: Q Science > QB Astronomy
Depositing User: Richard Chambers
Date Deposited: 13 Jan 2017 10:20
Last Modified: 10 Sep 2017 03:15
URI: http://sro.sussex.ac.uk/id/eprint/66153

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