Speaker
Isabel Mira Oldengott
(Universität Bielefeld)
Description
Starting from the collisional Boltzmann equation, we derive for the first time and from first principles a Boltzmann hierarchy for neutrinos including neutrino-neutrino interactions mediated by a scalar particle. Such interactions appear, for example, in majoron-like models of neutrino mass generation. In contrast to, e.g., the first-order Boltzmann hierarchy for Thomson-scattering photons, our interacting neutrino Boltzmann hierarchy contains additional momentum-dependent collision terms arising from a non-negligible energy transfer in the neutrino-neutrino scattering process. Lastly, although we have invoked majoron-like models as a motivation for our study, our treatment is in fact generally applicable to all scenarios in which the neutrino and/or other pre-thermalised relativistic fermions interact with scalar particles.
Primary authors
Cornelius Rampf
(University of Portsmouth)
Isabel Mira Oldengott
(Universität Bielefeld)
Yvonne Y. Y. Wong
(University of New South Wales)
