1610.02650v1 (1).pdf (184.41 kB)
Strongly scale-dependent CMB dipolar asymmetry from super-curvature fluctuations
journal contribution
posted on 2023-06-09, 04:41 authored by Christian ByrnesChristian Byrnes, Guillem Domènech, Misao Sasaki, Tomo TakahashiWe 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.
Funding
Royal Society URF
History
Publication status
- Published
File Version
- Accepted version
Journal
Journal of Cosmology and Astroparticle PhysicsISSN
1475-7516Publisher
IOP PublishingExternal DOI
Issue
12Volume
2016Page range
020Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2017-01-13First Open Access (FOA) Date
2017-12-13First Compliant Deposit (FCD) Date
2017-01-12Usage metrics
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