The lack of classical Cepheids in the inner part of the Galactic disk.

The suggestion for the origin of: "the lack of classical Cepheids in the inner part of the Galactic disk" is: the lack of massive Herbig Haro systems between massive SNova black holes. which are systematically ejected out of the Galaxy Disc, according to Quantum FFF Theory.
As a result, the smaller BHs stay put in the center of the galaxy, feeding the monster central black hole.see: Preference for Dual Herbig Haro Black Hole Consumption by the Central MW Black Hole, Leaving Plasma Jets Behind.
http://vixra.org/pdf/1807.0437v1.pdf
also see:
A lack of classical Cepheids in the inner part of the Galactic disk ( <8000 ly)
https://arxiv.org/pdf/1606.07943.pdf
and: https://www.sciencedaily.com/releases/2016/08/160801210354.htm
and:
Equal Sized New Physics Black Holes Do Not Merge but, Form Herbig Haro Systems.
see: http://vixra.org/pdf/1812.0228v2.pdf
Dual Solar Anchor Black Holes or Herbig Haro hotspots, the origin of quick star formation.
see: http://vixra.org/pdf/1709.0396v3.pdf

Cepheids around the MW center ( Red dots. Yellow star is Earth.)