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Microwave Background Correlations from Dipole Anisotropy Modulation · Around

2015

Microwave Background Correlations from Dipole Anisotropy Modulation

Aiola, Simone, Wang, Bingjie, Kosowsky, Arthur et al.

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Full-sky maps of the cosmic microwave background temperature reveal a 7% asymmetry of fluctuation power between two halves of the sky.

A common phenomenological model for this asymmetry is an overall dipole modulation of statistically isotropic fluctuations, which produces particular off-diagonal correlations between multipole coefficients.
We compute these correlations and construct corresponding estimators for the amplitude and direction of the dipole modulation.
Applying these estimators to various cut-sky temperature maps from Planck and WMAP data shows consistency with a dipole modulation, differing from a null signal at 2.5$\sigma$, with an amplitude and direction consistent with previous fits based on the temperature fluctuation power.

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