A new scale of function spaces characterizing homogeneous Besov spaces

We introduce and study a new scale of function spaces that characterize the homogeneous Besov spaces $\mathrm{\dot B}^{\beta}_{p,q}$, hence completing earlier work by Ullrich.

These new spaces include the ones introduced by Barton and Mayboroda, and systematically studied by Amenta under the name of weighted $\mathrm{Z}$-spaces, for the purpose of boundary value problems with $\mathrm{\dot B}^{\beta}_{p,p}$ data.

They are the counterparts to the weighted tent spaces with Whitney averages, developed by Huang, and arise as their real interpolants.

We describe their functional analytic properties: completeness, duality, embeddings, as well as their real and complex interpolants.