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Scale-dependent non-Gaussianity and the CMB power asymmetry
journal contribution
posted on 2023-06-09, 02:10 authored by Christian ByrnesChristian Byrnes, Ewan R M TarrantWe introduce an alternative parametrisation for the scale dependence of the non–linearity parameter fNL in quasi-local models of non–Gaussianity. Our parametrisation remains valid when fNL changes sign, unlike the commonly adopted power law ansatz fNL(k) ? knfNL. We motivate our alternative parametrisation by appealing to the self-interacting curvaton scenario, and as an application, we apply it to the CMB power asymmetry. Explaining the power asymmetry requires a strongly scale dependent non-Gaussianity. We show that regimes of model parameter space where fNL is strongly scale dependent are typically associated with a large gNL and quadrupolar power asymmetry, which can be ruled out by existing observational constraints.
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Publication status
- Published
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- Accepted version
Journal
Journal of Cosmology and Astroparticle PhysicsISSN
1475-7516External DOI
Issue
07Volume
2015Page range
007-007Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-07-15First Open Access (FOA) Date
2016-07-15First Compliant Deposit (FCD) Date
2016-07-15Usage metrics
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