Hemispherical power asymmetry from a space-dependent component of the adiabatic power spectrum

McDonald, John (2014) Hemispherical power asymmetry from a space-dependent component of the adiabatic power spectrum. Physical Review D, 89 (12). ISSN 1550-7998

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Abstract

The hemispherical power asymmetry observed by Planck and WMAP can be interpreted as due to a spatially-varying and scale-dependent component of the adiabatic power spectrum. We derive general constraints on the magnitude and scale-dependence of a component with a dipole spatial variation. The spectral index and the running of the spectral index can be significantly shifted from their inflation model values, resulting in a smaller spectral index and a more positive running. A key prediction is a hemispherical asymmetry of the spectral index and of its running. Measurement of these asymmetries can test the structure of the perturbation responsible for the cosmic microwave background power asymmetry.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review D
Additional Information:
© 2014 American Physical Society
Subjects:
ID Code:
73283
Deposited By:
Deposited On:
12 Mar 2015 15:04
Refereed?:
Yes
Published?:
Published
Last Modified:
12 Jul 2020 04:57