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  • PhysRevD.89.127303

    Rights statement: © 2014 American Physical Society

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

Research output: Contribution to journalJournal article

Article number127303
<mark>Journal publication date</mark>26/06/2014
<mark>Journal</mark>Physical Review D
Issue number12
Number of pages5
Publication statusPublished
Original languageEnglish


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.

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© 2014 American Physical Society