Deuterium can be created only in the first stages of formation of galaxies.
Deuterium is not created in the nucleosynthesis processes that take place in stars.
Deuterium can only be created by the process responsible for the decoupling of the cosmic background radiation.
Deuterium can only be created by the breakup of helium nuclei that takes place in the black holes that power the cores of distant quasars.
Deuterium can only be created by the processes that occurred during the earliest "Planck" era of quantum gravity after the Big Bang.