On the large-angle anomalies of the microwave sky
By C. Copi, D. Huterer, D. Schwarz, G. University, U. Chicago, U. Bielefeld. 2005
256 citations recorded by the source corpus.
We apply the multipole vector framework to full-sky maps derived from the first-year Wilkinson Microwave Anisotropy Probe (WMAP) data. We significantly extend our earlier work showing that the two lowest cosmologically interesting multipoles, � = 2 and 3, are not statistically isotropic. These results are compared to the findings obtained using related methods. In particular, we show that the planes of the quadrupole and the octopole are unexpectedly aligned. Moreover, the combined quadrupole plus octopole is surprisingly aligned with the geometry and direction of motion of the Solar system: the plane they define is perpendicular to the ecliptic plane and to the plane defined by the dipole direction, and the ecliptic plane carefully separates stronger from weaker extrema, running within a couple of degrees of the null-contour between a maximum and a minimum over more than 120 ◦ of the sky. Even given the alignment of the quadrupole and octopole with each other, we find that their alignment with the ecliptic is unlikely at >98 per cent confidence level (CL), and argue that it is in fact unlikely at >99.9 per cent CL. Most of the � = 2 and 3 multipole vectors of the known Galactic foregrounds are located far from those of the observed sky, strongly suggesting that residual contamination by such foregrounds is unlikely to be the cause of the observed correlations. Multipole vectors,
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/217a94a0a294491b584023173dadf293d717731b
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Citations in the corpus
- The Axis of Evil revisited (2006, background): “Much work has focussed on the alignment and “planarity” of these two multipoles (Copi et al. 2006; Schwarz et al. 2004; Ralston & Jain 2004); but in Land & Magueijo (2005b) it was seen that the alignment actually extends to the four multipoles ℓ = 2− 5, along the axis (b, l) ≈ (60,−100).”
- Large-Angle Anomalies in the CMB (2010, methodology): “Our studies (see [14]) indicate that the observed alignments are with the ecliptic plane, with the equinox, or with the CMB dipole, and not with the Galactic plane: the alignments of the quadrupole and octopole planes with the equinox/ecliptic/dipole directions are much more significant than those f”
- FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: COSMOLOGICAL INTERPRETATION (2008, unknown): “…et al. 2003; Larson & Wandelt 2004; Eriksen et al. 2004; Eriksen et al. 2004; Eriksen et al. 2004, 2007a; Copi et al. 2004; Schwarz et al. 2004; Copi et al. 2006, 2007; Gordon et al. 2005; Bielewicz et al. 2005; Jaffe et al. 2005, 2006; Vielva et al. 2004; Cruz et al. 2005, 2006, 2007b,a;…”
- INCREASING EVIDENCE FOR HEMISPHERICAL POWER ASYMMETRY IN THE FIVE-YEAR WMAP DATA (2009, background): “…nonGaussianity and violation of statistical isotropy in the WMAP data has grown very large, indeed (e.g., Bernui et al. 2006; Bielewicz et al. 2005; Copi et al. 2006; Cruz et al. 2005, 2006; Eriksen et al. 2004b,c, 2005; Jaffe et al. 2005, 2006; Mart́ınez-González et al. 2006; McEwen et al. 2008;…”
- No large-angle correlations on the non-Galactic microwave sky (2008, background): “…CMB, then there is overwhelming evidence (de Oliveira-Costa et al. 2004; Eriksen et al. 2004; Copi, Huterer & Starkman 2004; Schwarz et al. 2004; Copi et al. 2006; Copi et al. 2007; Land & Magueijo 2005a,b,c,d; Rakić & Schwarz 2007; for a review see Huterer 2006) of extremely unlikely phase…”
- Accelerating Cosmologies with an Anisotropic Equation of State (2007, background): “Several large-angle anomalies have been reported in the CMB (Eriksen et al. 2004; Land and Magueijo 2005; Copi et al. 2006).”