  A numerical coincidence Dp of -0.000489 was found between the ratios of
proton emission at 459-keV and cosmic background at 0.25-keV respect to proton
and to electron proper energy respectively. Multiplying 459-keV and 0.25-keV by
Dp, two more numerical coincidences were found with 0.1-keV background and
0.06-eV of neutrino energy, respectively. Global criticality phenomena plus c
and G discontinued decreasing provoke small cyclical reorganization of
particles and quanta originating background emissions every 30-Myr are propose.
At the beginning of each cycle, gradually emissions from electrons lasting 0.1
Myr originate the 0.25-keV background and, a possible 459-keV background from
proton emissions. At following cycle, the 459-keV quanta makes two emissions of
0.1-keV originating a diffuse background, and 0.25-keV quanta makes two of
0.06-eV originating the relic neutrinos. The Dp is a possible physical constant
that characterize the threshold, which trigger cyclical phenomena at space and
Earth every 30-Myr
