All Forces are the result of Dual Opposing Pressure Quantum Fields. Repelling and Attracktion.

A Fifth Force or Vacuum Dipole Repeller, (Casimir) Needed to Create All Repelling and Attraction Forces.

However NOT Around Black Holes in Quantum FFF Theory. 

Attraction of BHs is only based on vacuum Casimir pressure.

(see also Magnetic Monopole Telescope)

see:  https://vixra.org/pdf/1806.0368v1.pdf

and: Equal Sized New Physics Black Holes Do Not Merge but, Form Herbig Haro Systems.

see: https://vixra.org/pdf/1812.0228v2.pdf