Neutrinos — Inner Properties and Role as Astrophysical Messengers

Raffelt, Georg G.

doi:10.1007/3-540-26798-0_2

Cited by 1 publication

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“…Neutrino Cosmology is one of the hottest topics in theoretical and experimental cosmology following the recent discovery that neutrinos may be massive [1]. The cosmological implications of massive neutrinos, which include the impact of massive neutrinos on the cosmic microwave background radiation [2,3] and big bang nucleosynthesis, have recently been reviewed by Dolgov [4] and Raffelt [5].…”

Section: A Neutrino Cosmologymentioning

confidence: 99%

Linear wave spectrum associated with collective neutrino-plasma interactions in the early universe

Brizard

McGregor

2002

New J. Phys.

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The effects of collective neutrino-plasma interactions on the linear wave spectrum supported by a magnetized electron-positron plasma in the presence of a neutrino-antineutrino medium are investigated. When a pair-symmetric background neutrino-plasma medium is perturbed by space-charge waves (electrostatic waves associated with electron-positron charge separation), our analysis shows that the neutrino and antineutrino fluids also separate and the pair symmetry of the background medium is broken. The cosmological implications of this pair-symmetry breaking mechanism are briefly discussed.PACS numbers: 13.10.+q, 52.30.-q, 98.80.Cq 3/2MeV rad/sec) is larger than the neutrino-matter collision rate c/ℓ ν by a factor ω p ℓ ν /c ≃ 1.3 × 10 21 T −7/2 MeV , which is larger than unity when the neutrino-matter temperatures are smaller than 10 6 MeV. In addition, the ratio of the plasma frequency to the photon-matter collision rate (c/ℓ γ ≃ 4.8 × 10 17 T 3 MeV sec −1 ) is expressed as ω p ℓ γ /c ≃ 560 T −3/2 MeV , which exceeds unity for temperatures less than 70 MeV. Hence, the short-time evolution of the primordial neutrino-plasma medium (in the temperature range 1 MeV < T < 10 MeV) appears to be dominated by collective (collisionless) effects.

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