Q-FFF Answer: the Axion Higgs string nucleus compressed by the vacuum itself.
The Axion-Higgs vacuum with Pyrochlore lattice structure.
Black holes grow, by eating the vacuum oscillating string lattice.
BHs do NOT eat: fermionic matter!! due to the fermion propeller form, spinning away from the black hole horizon due to the polarized lattice pushing the fermion propeller back! at a variable horizon distance dependent of the fermion charge.
see: Tidal Star Disruption Events (TDE) by Fermion Repelling Black Holes in Quantum FFF Theory.
http://vixra.org/pdf/1805.0541v1.pdf
and: Equal Sized Rigid String Based New Black Holes do not Merge, But Form Herbig Haro Systems.
http://vixra.org/pdf/1812.0228v1.pdf
For charged black holes see also:
Firewalls in General Relativity, by David E. Kaplan ∗1 and Surjeet Rajendran ∗2
https://arxiv.org/pdf/1812.00536.pdf
Susskind interview telling: ER=EPR Wormhole tunnels is the same as Entanglement between two regeons of space like two black holes. ( a shortcut between them)
See : https://www.youtube.com/watch?v=CQAcLW6qdQY&feature=youtu.be&t=49m
Suggestion we can observe those tunnels in space as jets between Herbig Haro systems see: HH34.
at the same time , we need ER tunneling between distant Charge Parity symmetric copy universes stop the unlimmited creation of multiverse bubbles.
see also: ER=EPR in the Supersymmetric Cyclic Multiverse and in the lab without strange Cats.
http://vixra.org/pdf/1604.0229v2.pdf
If new charged black holes create charged plasma out of the quantum foam vacuum ( as observed by Herbig Haro 34) then it seems to violate physics and also white holes should be ifferent. see:
Apparent Violation of the Second Law, Around (New physics) Black Hole Nuclei and Other Quantum Knots.
see: http://vixra.org/pdf/1809.0189v1.pdf
For charged black holes, see:
Firewalls in General Relativity, by David E. Kaplan ∗1 and Surjeet Rajendran ∗2
https://arxiv.org/pdf/1812.00536.pdf