Is the Cosmic Microwave Background Asymmetry due to the Kinematic Dipole?

Details Is the Cosmic Microwave Background Asymmetry due to the Kinematic Dipole? Is the Cosmic Microwave Background Asymmetry due to the Kinematic Dipole?

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...749...31n&link_type=abstract

The Astrophysical Journal, Volume 749, Issue 1, article id. 31 (2012).

Astronomy and Astrophysics

Astronomy

1

Cosmic Background Radiation, Early Universe, Methods: Data Analysis, Methods: Statistical

Scientific paper

Parity violation found in the cosmic microwave background (CMB) radiation is a crucial clue for the non-standard cosmological model or the possible contamination of various foreground residuals and/or calibration of the CMB data sets. In this paper, we study the directional properties of the CMB parity asymmetry by excluding the m = 0 modes in the definition of parity parameters. We find that the preferred directions of the parity parameters coincide with the CMB kinematic dipole, which implies that the CMB parity asymmetry may be connected with the possible contamination of the residual dipole component. We also find that such tendency is not only localized at l = 2, 3, but in the extended multipole ranges up to l ~ 22.

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