A conformal freeze-in model with a neutrino portal can produce the observed dark matter abundance and, in part of its parameter space, the neutrino mass scale, while evading X-ray constraints for composite sterile-neutrino dark matter.
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We examine a scenario where the Higgs is part of an approximate conformal field theory, and has a scaling dimension greater than one. Such an unparticle Higgs (or Unhiggs) can still break electroweak symmetry and unitarize WW scattering, but its gauge couplings are suppressed. An Unhiggs model has a reduced sensitivity of the weak scale to the cutoff, and can thus provide a solution to the little hierarchy problem.
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Conformal Freeze-In from Neutrino Portal
A conformal freeze-in model with a neutrino portal can produce the observed dark matter abundance and, in part of its parameter space, the neutrino mass scale, while evading X-ray constraints for composite sterile-neutrino dark matter.