8-Spinor Quantum Gravity

Quantum gravity has been so elusive because we have tried to approach it by two paths which can never meet: quantum mechanics and general relativity. These contradict each other not only in superdense regimes, but also in the vacuum. We explore a straight road to quantum gravity here—the one mandated by Clifford-algebra covariance. This bridges the gap from microscales— where the massive Dirac propagator is a sum over null zig-zags—to macroscales— where we see the energy-momentum current, ∗T and the resulting Einstein curvature, ∗G. For massive particles, ∗T flows in the “cosmic time” direction, y—centrifugally in an expanding universe. Neighboring centrifugal currents of ∗T present opposite spacetime vorticities ∗G to the boundaries of each others’ worldtubes, so they advect— i.e. attract, as we show here by integrating a Spinc-4 Lagrangian by parts in the spinfluid regime. This boundary integral not only explains why stress-energy ∗T is the source for gravitational curvature ∗G, but also gives a value for the gravitational constant, κ (