Anisotropy of the Cosmic Neutrino Background

Details Anisotropy of the Cosmic Neutrino Background Anisotropy of the Cosmic Neutrino Background

2006-08-14

arxiv.org/abs/astro-ph/0608303v2

JCAP 0701:014,2007

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures / updated references, discussion of earlier work

Scientific paper

10.1088/1475-7516/2007/01/014

The cosmic neutrino background (CNB) consists of low-energy relic neutrinos which decoupled from the cosmological fluid at a redshift z ~ 10^{10}. Despite being the second-most abundant particles in the universe, direct observation remains a distant challenge. Based on the measured neutrino mass differences, one species of neutrinos may still be relativistic with a thermal distribution characterized by the temperature T ~ 1.9K. We show that the temperature distribution on the sky is anisotropic, much like the photon background, experiencing Sachs-Wolfe and integrated Sachs-Wolfe effects.

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