Paper detail

Functional properties of Hörmander's space of distributions having a specified wavefront set

The space $D'_Γ$ of distributions having their wavefront sets in a closed cone $Γ$ has become important in physics because of its role in the formulation of quantum field theory in curved space time. In this paper, the topological and bornological properties of $D'_Γ$ and its dual $E'_Λ$ are investigated. It is found that $D'_Γ$ is a nuclear, semi-reflexive and semi-Montel complete normal space of distributions. Its strong dual $E'_Λ$ is a nuclear, barrelled and bornological normal space of distributions which, however, is not even sequentially complete. Concrete rules are given to determine whether a distribution belongs to $D'_Γ$, whether a sequence converges in $D'_Γ$ and whether a set of distributions is bounded in $D'_Γ$.