Noncommutative Unification of General Relativity and Quantum Mechanics

TL;DR

This paper extends a noncommutative geometric model unifying general relativity and quantum mechanics to noncompact groups, demonstrating it reproduces known physics and explains the measurement process.

Contribution

It develops the noncommutative unification model for noncompact groups, including Lorentz groups, and shows it aligns with established physics and the measurement collapse.

Findings

Model works with noncompact groups like Lorentz group

Generalized Einstein equation as eigenvalue problem

Quantum mechanics emerges via measurement collapse

Abstract

In Gen. Rel. Grav. (36, 111-126 (2004); in press, gr-qc/0410010) we have proposed a model unifying general relativity and quantum mechanics based on a noncommutative geometry. This geometry was developed in terms of a noncommutative algebra A defined on a transformation groupoid given by the action of a group G on a space E. Owing to the fact that G was assumed to be finite it was possible to compute the model in full details. In the present paper we develop the model in the case when G is a noncompact group. It turns out that also in this case the model works well. The case is important since to obtain physical effects predicted by the model we should assume that G is a Lorentz group or some of its representations. We show that the generalized Einstein equation of the model has the form of the eigenvalue equation for the generalized Ricci operator, and all relevant operators in the quantum sector of the model are random operators; we study their dynamics. We also show that the model correctly reproduces general relativity and the usual quantum mechanics. It is interesting that the latter is recovered by performing the measurement of any observable. In the act of such a measurement the model ``collapses'' to the usual quantum mechanics.