Your ideas are very insightful, and certainly ask questions as to origination of energetics in what you would think were dead zones (maybe these dead zones are not so dead after all?). Usually the source for gamma ray production is a matter and antimatter annihilation. How would colliding light waves interact to form super cosmic rays as a "diffuse gamma ray background” between two galactic "Gravity Wells?" Let's take a look at black holes (collapsed stars) at the galactic core, most likely there is an antimatter core (my conclusion) that rotates in the opposite direction and forms a ring current antimatter matter annihilation zone around the core poles emitting a constant flow of gamma ray jets around a central fountain of antimatter. It could be that the antimatter would gather in the high pressure zones between galaxies.
Other possibilities may exist, that an FTL higher (higher light spectrum)scale impact zone exists between high pressure areas between the low pressure spinning galaxies. The CG origination zone might be an area around the current sheet and galactic bubbles where incoming gravitons are flowing into the galactic plane.
John
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