Originally published on 8 April 2011 under the title The Structure of a Black Hole.
The gravitational field at a black hole event horizon is not determined solely by the total mass within the respective half of the core, but also by the duration of time the event horizon has existed. For the matter half of the core, the relationship is given by the integral of the product of the total mass of matter and the time duration over which the event horizon existed corresponding to that mass value. Similarly, for the antimatter half of the core, the relationship is given by the integral of the product of the total mass of antimatter and the time duration over which the event horizon existed corresponding to that mass value.