Pearson’s random walk in the space of the CMB phases: Evidence for parity asymmetry

Martin Anders Kirstejn Hansen; Anne Mette Frejsel; Jaiseung Kim; Pavel Nasselski; F. Nesti

doi:10.1103/PhysRevD.83.103508

Pearson’s random walk in the space of the CMB phases: Evidence for parity asymmetry

Martin Anders Kirstejn Hansen, Anne Mette Frejsel, Jaiseung Kim, Pavel Nasselski, F. Nesti

18 Citationer (Scopus)

Abstract

The temperature fluctuations of the cosmic microwave background (CMB) are supposed to be distributed randomly in both magnitude and phase, following to the simplest model of inflation. In this paper, we look at the odd and even multipoles of the spherical harmonic decomposition of the CMB, and the different characteristics of these, giving rise to a parity asymmetry. We compare the even and odd multipoles in the CMB power spectrum, and also the even and odd mean angles. We find for the multipoles of the power spectrum that there is power excess in odd multipoles, compared to even ones, meaning that we have a parity asymmetry. Further, for the phases, we present a random walk for the mean angles, and find a significant separation for even/odd mean angles, especially so for galactic coordinates. This is further tested and confirmed with a directional parity test, comparing the parity asymmetry in galactic and ecliptic coordinates.

Originalsprog	Engelsk
Artikelnummer	103508
Tidsskrift	Physical Review D (Particles, Fields, Gravitation and Cosmology)
Vol/bind	83
Udgave nummer	10
ISSN	1550-7998
DOI	https://doi.org/10.1103/PhysRevD.83.103508
Status	Udgivet - 5 maj 2011

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10.1103/PhysRevD.83.103508

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AU - Hansen, Martin Anders Kirstejn

AU - Frejsel, Anne Mette

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AU - Nasselski, Pavel

AU - Nesti, F.

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N2 - The temperature fluctuations of the cosmic microwave background (CMB) are supposed to be distributed randomly in both magnitude and phase, following to the simplest model of inflation. In this paper, we look at the odd and even multipoles of the spherical harmonic decomposition of the CMB, and the different characteristics of these, giving rise to a parity asymmetry. We compare the even and odd multipoles in the CMB power spectrum, and also the even and odd mean angles. We find for the multipoles of the power spectrum that there is power excess in odd multipoles, compared to even ones, meaning that we have a parity asymmetry. Further, for the phases, we present a random walk for the mean angles, and find a significant separation for even/odd mean angles, especially so for galactic coordinates. This is further tested and confirmed with a directional parity test, comparing the parity asymmetry in galactic and ecliptic coordinates.

AB - The temperature fluctuations of the cosmic microwave background (CMB) are supposed to be distributed randomly in both magnitude and phase, following to the simplest model of inflation. In this paper, we look at the odd and even multipoles of the spherical harmonic decomposition of the CMB, and the different characteristics of these, giving rise to a parity asymmetry. We compare the even and odd multipoles in the CMB power spectrum, and also the even and odd mean angles. We find for the multipoles of the power spectrum that there is power excess in odd multipoles, compared to even ones, meaning that we have a parity asymmetry. Further, for the phases, we present a random walk for the mean angles, and find a significant separation for even/odd mean angles, especially so for galactic coordinates. This is further tested and confirmed with a directional parity test, comparing the parity asymmetry in galactic and ecliptic coordinates.

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Pearson’s random walk in the space of the CMB phases: Evidence for parity asymmetry

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