Anomalous parity asymmetry of WMAP power spectrum data at low multpoles: is it cosmological or systematics?

Details Anomalous parity asymmetry of WMAP power spectrum data at low multpoles: is it cosmological or systematics? Anomalous parity asymmetry of WMAP power spectrum data at low multpoles: is it cosmological or systematics?

2010-01-31

arxiv.org/abs/1002.0148v6

Physical Review D (Vol.82, No.6) 2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

v2: investigation on non-cosmological origins significantly extended v3: consideration of posterior bias included, v6: pdf fil

Scientific paper

10.1103/PhysRevD.82.063002

We have investigated the odd-parity preference of the WMAP 7 year power spectrum. Comparison with simulation shows the odd-parity preference of WMAP data (2<= l <=22) is anomalous at 4-in-1000 level. We have investigated its origins, and ruled out some of non-cosmological origins such as asymmetric beams, noise and cut-sky effect. We also find primordial origin requires |Re[\Phi(\mathbf k)]|\ll|Im[\Phi(\mathbf k)]| for k\lesssim 22/\eta_0, where \eta_0 is the present conformal time. Multipoles associated with the odd-parity preference happen to coincide with some of other CMB anomalies. Therefore, there may exist a common origin, whether cosmological or not. Besides, we find it likely that low quadrupole power is the part of this odd-parity preference anomaly rather than an isolated one. The Planck surveyor, which possesses wide frequency coverage and systematics distinct from the WMAP, may allow us to resolve the mystery of the anomalous odd-parity preference.

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