Projective Quantum Mechanics

TL;DR

This paper explores the geometric quantization of complex phase spaces by constructing specific Hilbert bundles, revealing a classification of vacua via the Picard group, and showing quantum states as tangent vectors.

Contribution

It explicitly constructs Hilbert-space bundles over complex phase spaces and links vacua classification to the Picard group, extending geometric quantization methods.

Findings

Quantum states are tangent vectors to the phase space.

Vacua are classified by elements of the Picard group.

Hilbert bundles split into tangent and line bundle components.

Abstract

We study the quantisation of complex, finite-dimensional, compact, classical phase spaces C, by explicitly constructing Hilbert-space vector bundles over C. We find that these vector bundles split as the direct sum of two holomorphic vector bundles: the holomorphic tangent bundle T(C), plus a complex line bundle N(C). Quantum states (except the vacuum) appear as tangent vectors to C. The vacuum state appears as the fibrewise generator of N(C). Holomorphic line bundles N(C) are classified by the elements of Pic(C), the Picard group of C. In this way Pic(C) appears as the parameter space for nonequivalent vacua. Our analysis is modelled on, but not limited to, the case when C is complex projective space.