  The Majoron, the Nambu-Goldstone boson of lepton number symmetry, is an
interesting candidate for dark matter as it deeply connects the dark matter and
neutrino physics. In this paper, we consider the Majoron dark matter as pseudo
Nambu-Goldstone boson with TeV-scale mass. The heavy Majoron generally has the
large decay constant and tiny Yukawa couplings to light right-handed neutrinos
which are required by cosmological and astrophysical observations. That makes
it difficult to realize the desired amount of the relic abundance of Majoron
dark matter. We consider three improved scenarios for the generation of
Majoron, dubbed as Majorogenesis, in the early universe and find in all cases
the parameter space compatible with the relic abundance and cosmic-ray
constraints.
