Isoperimetric Profiles and Regular Embeddings of locally compact groups

In this article we extend the notion of Lᵖ-measured subgroups couplings; a quantitative asymmetric version of measure equivalence that was introduced by Delabie, Koivisto, Le Ma\^itre and Tessera for finitely generated groups, to the setting of locally compact compactly generated unimodular groups. As an example of these couplings; using ideas from Bader and Rosendal, we prove a "dynamical criteria" for the existence of regular embeddings between amenable locally compact compactly generated unimodular groups, namely the existence of an L^∞-measured subgroup coupling that is coarsely m to $1$. We then proceed to prove that the existence of an Lᵖ-measured subgroup that is coarsely m to $1$ implies the monotonicity of the Lᵖ-isoperimetric profile. We conclude then that the Lᵖ-isoperimetric profile is monotonous under regular embeddings, as well as coarse embeddings, between amenable unimodular locally compact compactly generated groups.