How Many Dark Neutrino Sectors Does Cosmology Allow?

Alan Zander; Manuel Ettengruber; Philipp Eller

How Many Dark Neutrino Sectors Does Cosmology Allow?

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arxiv 2308.00798 v2 pith:5R7OA4W5 submitted 2023-08-01 hep-ph

How Many Dark Neutrino Sectors Does Cosmology Allow?

Alan Zander , Manuel Ettengruber , Philipp Eller This is my paper

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We present the very first constraints on the number of Standard Model (SM) copies with an additional Dirac right-handed neutrino. From cosmology, we are able to pose strong limits on large regions of the parameter space. Moreover, we show that it is possible to account for the right dark matter density in form of stable particles from the dark sectors.

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Neutrino Masses and Phenomenology in Nnaturalness
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Nnaturalness generates neutrino mass matrices through multi-sector mixing, excludes democratic couplings, and yields a tower of neutrino eigenstates with theory-determined mass splittings.