Parity in the CMB: Space Oddity

Дата и время публикации : 2011-08-08T13:36:12Z

Авторы публикации и институты :
Assaf Ben-David
Ely D. Kovetz
Nissan Itzhaki

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 6 pages, 7 figures. Accepted for publication in The Astrophysical Journal
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO, hep-ph, hep-th

Краткий обзор статьи: We search for a direction in the sky that exhibits parity symmetry under reflections through a plane. We use the natural estimator, which compares the power in even and odd $ell+m$ multipoles, and apply minimal blind masking of outliers to the ILC map in order to avoid large errors in the reconstruction of multipoles. The multipoles of the cut sky are calculated both naively and by using the covariance inversion method and we estimate the significance of our results using $Lambda$CDM simulations. Focusing on low multipoles, $2leq ell leq ell_{max}$ with $ell_{max}=5,6$ or even 7, we find two perpendicular directions of even and odd parity in the map. While the even parity direction does not appear significant, the odd direction is quite significant — at least a $3.6sigma$ effect.

Category: Physics