The spacetime (=the oscillating vacuum ) concentration, seems the origin of "head to head collision" of vacuum particles, which are suggested to be transformer particles by real collision processes.
A compact string knot black hole ( Q-FFF Theory) could be called a growing "singularity" inside the external large light horizon , which seems to represent as a growing globular photon collider. By the collision, the oscillating transformer vacuum particles of the vacuum (also photons) transfer into symmetric propeller shaped electrons and positrons (pair production) , which partly annihilate and consequently produce Gamma rays.
However by preference, positrons partly also pick up photons to make compound propeller shaped expelled leptons and quarks to form simple gas plasma nuclei, H,N O etc. the base for the growing universe after the big bang and even comets.
It is known that the gamma radiation of the Milky way comes not only out of the globular center, but also out of a bar-like star body, like many galaxies seem to represent. So the central galaxy gamma radiation comes, not only from the galaxy giant black hole in the center but also ( or even mainly) from the bar shaped stars in the center, which is a support for Q-FFF Theory's postulate that each stellar system is created by at least two equal sized "bow shock' black holes of an early Herbig Haro system.
See the globular vacuum collider below.
