Rights statement: © 2014 American Physical Society
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Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Hemispherical power asymmetry from a space-dependent component of the adiabatic power spectrum
AU - McDonald, John
N1 - © 2014 American Physical Society
PY - 2014/6/26
Y1 - 2014/6/26
N2 - 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.
AB - 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.
KW - WMAP DATA
KW - SKY MAPS
U2 - 10.1103/PhysRevD.89.127303
DO - 10.1103/PhysRevD.89.127303
M3 - Journal article
VL - 89
JO - Physical Review D
JF - Physical Review D
SN - 1550-7998
IS - 12
M1 - 127303
ER -