Gravity in Curved Spacetime yields Quantum Mechanics in Flat Spacetime

We propose that what is gravity in curved spacetime yields quantum
mechanics in flat spacetime. This implies that if there was no gravity,
quantum mechanics would not exist. In other words, the universe is
general relativistic, and therefore, classical and local, in curved
spacetime, but the same universe is quantum and nonlocal (Newtonian),
when projected onto special relativistic flat spacetime. We previously
demonstrated how the quantum Schrödinger equation arises from a
classical Schrödinger equation, which in turn arises from Newtonian
gravity. Here, we illustrate that the classical Schrödinger equation
corresponds to Einstein’s field equation of gravity for Schwarzschild
metric in curved spacetime. Since the Schwarzschild metric is an exact
solution of the vacuum Einstein equation, the Schwarzschild radius is
for Ricci flat spacetime but with non-zero Riemannian curvature. It then
follows that quantum mechanics arises from this Riemannian curvature of
gravity.