Neutrino and antineutrino elastic scattering and photoneutrino reactions

Aydin, Z. Z.; Barut, A. O.; Duru, Ì. H.

doi:10.1103/physrevd.28.2872

Cited by 3 publications

(1 citation statement)

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“…In the early universe, a Majorana neutrino can magnetically interact with electrons and positrons as well as photons and other neutrinos. However magnetic neutrino-neutrino scattering and interactions between neutrinos and photons (such as neutrino Compton scattering) are proportional to the fourth power of the magnetic moment [36] and so are suppressed relative to interactions with electrons and positrons which are proportional to the second power of the magnetic moment. Here we explore effects on the primordial abundances when enhanced interactions between electrons/positrons and Majorana neutrinos via magnetic scattering and annihilation channels are taken into account.…”

Section: Introductionmentioning

confidence: 99%

Majorana neutrino magnetic moment and neutrino decoupling in big bang nucleosynthesis

et al. 2015

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We examine the physics of the early universe when Majorana neutrinos (νe, νµ, ντ ) possess transition magnetic moments. These extra couplings beyond the usual weak interaction couplings alter the way neutrinos decouple from the plasma of electrons/positrons and photons. We calculate how transition magnetic moment couplings modify neutrino decoupling temperatures, and then use a full weak, strong, and electromagnetic reaction network to compute corresponding changes in Big Bang Nucleosynthesis abundance yields. We find that light element abundances and other cosmological parameters are sensitive to magnetic couplings on the order of 10 −10 µB. Given the recent analysis of sub-MeV Borexino data which constrains Majorana moments to the order of 10 −11 µB or less, we find that changes in cosmological parameters from magnetic contributions to neutrino decoupling temperatures are below the level of upcoming precision observations.

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Section: Introductionmentioning

confidence: 99%