Background independent quantum mechanics, metric of quantum states, and gravity: A comprehensive perspective

This paper presents a comprehensive perspective of the metric of quantum states with a focus on the geometry in the background independent quantum mechanics. We also explore the possibilities of geometrical formulations of quantum mechanics beyond the quantum state space and Kahler manifold. The metric of quantum states in the classical configuration space with the pseudo- Riemannian signature and its possible applications are explored. On contrary to the common perception that a metric for quantum state can yield a natural metric in the configuration space when the limit h -> 0, we obtain the metric of quantum states in the configuration space without imposing the limiting condition h -> 0. Here Planck's constant h is absorbed in the quantity like Bohr radii 1/2mZ alpha similar to a(0). While exploring the metric structures associated with Hydrogen like atom, we witness another interesting finding that the invariant lengths appear in the multiple of Bohr's radii as: ds(2) = a(0)(2) (del psi)(2).