Projective connections and extremal domains for analytic content

TL;DR

This paper discusses the classification of extremal domains for analytic content in two dimensions, showing they are only disks and annuli, and explores their implications for quantum deformation and conformal invariance in physics.

Contribution

It extends previous results by proving that extremal domains are limited to disks and annuli, linking these to quantum deformation parameters and conformal invariance.

Findings

Extremal domains for analytic content are only disks and annuli.

Annular solutions form a continuous family corresponding to quantum deformation parameters.

Analytic content measures non-commutativity of certain operators and relates to Planck's constant.

Abstract

This note expands on the recent proof \cite{ABKT} that the extremal domains for analytic content in two dimensions can only be disks and annuli. This result's unexpected implication for theoretical physics is that, for extremal domains, the analytic content is a measure of non-commutativity of the (multiplicative) adjoint operators $T, T^{\dag}$, where $T^{\dag} = \bar z$, and therefore of the quantum deformation parameter (``Planck's constant"). The annular solution (which includes the disk as a special case) is, in fact, a continuous family of solutions, corresponding to all possible positive values of the deformation parameter, consistent with the physical requirement that conformal invariance in two dimensions forbids the existence of a special length scale.