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Title: Alignments of parity even/odd-only multipoles in CMB

Abstract

We compare the statistics of parity even and odd multipoles of the cosmic microwave background (CMB) sky from Planck full mission temperature measurements. An excess power in odd multipoles compared to even multipoles has previously been found on large angular scales. Motivated by this apparent parity asymmetry, we evaluate directional statistics associated with even compared to odd multipoles, along with their significances. Primary tools are the Power tensor and Alignment tensor statistics. We limit our analysis to the first 60 multipoles i.e. l = [2, 61]. We find no evidence for statistically unusual alignments of even parity multipoles. More than one independent statistic finds evidence for alignments of anisotropy axes of odd multipoles, with a significance equivalent to ~2σ or more. The robustness of alignment axes is tested by making Galactic cuts and varying the multipole range. Very interestingly, the region spanned by the (a)symmetry axes is found to broadly contain other parity (a)symmetry axes previously observed in the literature.

Authors:
 [1];  [2];  [3]
  1. Univ. of Cape Town (South Africa). Dept. of Mathematics and Applied Mathematics, Cosmology & Gravity Group
  2. Univ. of Kansas, Lawrence, KS (United States). Dept. of Physics and Astronomy
  3. Univ. of Cape Town (South Africa). Dept. of Mathematics and Applied Mathematics, Cosmology & Gravity Group; Inst. for Advanced Study, Princeton, NJ (United States); Flatiron Inst., New York, NY (United States). Center for Computational Astrophysics
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE
OSTI Identifier:
1526487
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 472; Journal Issue: 2; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English

Citation Formats

Aluri, Pavan K., Ralston, John P., and Weltman, Amanda. Alignments of parity even/odd-only multipoles in CMB. United States: N. p., 2017. Web. doi:10.1093/mnras/stx2112.
Aluri, Pavan K., Ralston, John P., & Weltman, Amanda. Alignments of parity even/odd-only multipoles in CMB. United States. doi:10.1093/mnras/stx2112.
Aluri, Pavan K., Ralston, John P., and Weltman, Amanda. Thu . "Alignments of parity even/odd-only multipoles in CMB". United States. doi:10.1093/mnras/stx2112. https://www.osti.gov/servlets/purl/1526487.
@article{osti_1526487,
title = {Alignments of parity even/odd-only multipoles in CMB},
author = {Aluri, Pavan K. and Ralston, John P. and Weltman, Amanda},
abstractNote = {We compare the statistics of parity even and odd multipoles of the cosmic microwave background (CMB) sky from Planck full mission temperature measurements. An excess power in odd multipoles compared to even multipoles has previously been found on large angular scales. Motivated by this apparent parity asymmetry, we evaluate directional statistics associated with even compared to odd multipoles, along with their significances. Primary tools are the Power tensor and Alignment tensor statistics. We limit our analysis to the first 60 multipoles i.e. l = [2, 61]. We find no evidence for statistically unusual alignments of even parity multipoles. More than one independent statistic finds evidence for alignments of anisotropy axes of odd multipoles, with a significance equivalent to ~2σ or more. The robustness of alignment axes is tested by making Galactic cuts and varying the multipole range. Very interestingly, the region spanned by the (a)symmetry axes is found to broadly contain other parity (a)symmetry axes previously observed in the literature.},
doi = {10.1093/mnras/stx2112},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 2,
volume = 472,
place = {United States},
year = {2017},
month = {8}
}

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