Wormholes

From Poplawski we get:

"As the particle moves from infinity to r = r_g /4, θ decreases from 0 to −3/(2r_g ). At r = r_g /4, θ undergoes a discontinuity, jumping to 3/(2r_g ). As the particle moves from r = r_g /4 to r = 0, θ decreases back to zero. The discontinuity of the expansion scalar at the event horizon of a wormhole prevents θ from decreasing to −∞, as it occurs inside a Schwarzschild black hole. Therefore this discontinuity guarantees that timelike geodesics in the gravitational field of a wormhole are complete."

This is the mathematics that goes with Frampton's solution to the Dark Energy Problem: There is no Dark Energy, because Gravity is not fundamental, and there is universal acceleration, because we are inside a black hole.