Representations of conformal nets associated with infinite-dimensional groups

TL;DR

This paper explores the deep connection between representations of infinite-dimensional Lie groups and conformal nets, demonstrating that conformal net representations inherently possess diffeomorphism covariance and naturality properties.

Contribution

It establishes that all conformal net representations associated with certain infinite-dimensional groups are automatically diffeomorphism covariant and exhibit naturality in their covariance cocycles.

Findings

Any conformal net representation induces a positive-energy group representation.

All such representations are automatically diffeomorphism covariant.

Covariance cocycles satisfy naturality and equivariance under diffeomorphisms.

Abstract

We study the relation between representations of certain infinite-dimensional Lie groups and those of the associated conformal nets. For a chiral conformal net extending the net generated by the vacuum representation of a loop group or diffeomorphism group of the circle, we show that any conformal net representation induces a positive-energy representation of the corresponding group. Consequently, we prove that any representation of such a conformal net is automatically diffeomorphism covariant. Moreover, we show that the covariance cocycles of conformal net representations satisfy naturality with respect to the action of diffeomorphisms, i.e. the diffeomorphisms act equivariantly on the category of conformal net representations.