English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Both WMAP and Planck data show a significant odd-multipole preference in thelarge scales of the cosmic microwave background (CMB) temperature anisotropies.If this pattern originates from cosmological effects, then it can be considereda crucial clue for a violation in the cosmological principle. By definingvarious direction dependent statistics in the full-sky Planck 2015 maps (see,for instance, Naselsky et al. (2012); W. Zhao (2014)), we found that the CMBparity asymmetry has a preferred direction, which is independent of the choicesof the statistics. In particular, this preferred axis is strongly aligned withthose in the CMB quadrupole and octopole, as well as that in the CMB kinematicdipole, which hints to their non-cosmological origin. In realisticobservations, the foreground residuals are inevitable, and should be properlymasked out in order to avoid possible misinterpretation of the results. In thispaper, we extend our previous analyses to the masked Planck 2015 data. Bydefining a similar direction dependent statistic in the masked map, we find apreferred direction of the CMB parity asymmetry, in which the axis alsocoincides with that found in the full-sky analysis. Therefore, our conclusionson the CMB parity violation and its directional properties are confirmed.

Preferred axis of CMB parity asymmetry in the masked maps