The Phenomenology of Right Handed Neutrinos
  Neutrinos are the only particles in the Standard Model of particle physics
that have only been observed with left handed chirality to date. If right
handed neutrinos exist, they could be responsible for several phenomena that
have no explanation within the Standard Model, including neutrino oscillations,
the baryon asymmetry of the universe, dark matter and dark radiation. After a
pedagogical introduction, we review recent progress in the phenomenology of
right handed neutrinos. We in particular discuss the mass ranges suggested by
hints for neutrino oscillation anomalies and dark radiation (eV), sterile
neutrino dark matter scenarios (keV) and experimentally testable theories of
baryogenesis (GeV to TeV). We summarize constraints from theoretical
considerations, laboratory experiments, astrophysics and cosmology for each of
these.
