The Mitra and Kauffmann papers along with the Mersini-Houghton work were all really quite illuminating (sorry for the pun). The take away message is that the key to uniting gravity and charge force is at the event horizon.
This is really sweet. The boson star literature has struggled for decades to make that connection with the event horizon as well. It is surprising that a suitable answer has not been forthcoming given the assumptions of space time.
By throwing space under the bus, the contracting universe seems to have a straightforward Schrödinger metric that shows Lorentz invariance and seems to result in either or both gravity or charge depending on the scale and parity of the interaction.
To make a long story short, the typical metric of GR is like a norm or absolute value because it is squared. The square of proper time differential is what I posted before
dtau2 = (1 - 2mi/mo) dt2 + 2(t-to)2/alpha2/mo2 dmo2
But the equation is amplitude and phase, which is like a mean square root energy. Putting these things together is possible in matter time since all matter decays and that decay represents a fundamental link between charge and gravity forces.
The GR metric involves the product of a pair of counterpropagating Schrödinger metrics as complementary matter waves
dtau2 = d tau(+) d tau(-)
d tau(+/-) =(1 - i sqrt(2)psi(inertial)/psi(rest) +/- i 2(t-to) md c^2 /(h/2pi)/alpha/mo^2 dmo^2 ) dt
The Schrödinger metric pair reduces to the inner Schrödinger equation for single particles and represents the outer gravity solution as a pair of complementary particles. The md is the binding energy and ends up as either charge or gravity or a combination of both, so this includes all EM forces.
It is nice that at least in one universe, matter time, there is a fairly straightforward connection between gravity and charge forces. Space is not out of the picture and is simply a result of this action as
ds^2 = c d tau^2
The GR of space time is not wrong, it is just that its circular logic is a dean end with the tails of spatial tensors ending up back to the dragon's mouth, the black hole.
Matter decay provides a method of maintaining Lorentz invariance without spatial tensors and closing the universe nicely on itself. The Schrödinger metric now has continuous solutions even inside of the event horizon, where it is pure light and trapped by the event horizon. No information is lost and there is a temperature and an entropy and the the spin would be near c.
We as beings of atomic time would not do well either near or inside of a black hole, but then again, we also would not do well near or inside of our own sun.