# Bent Ørsted

## Invariant differential operators on H-type groups and discrete components in restrictions of complementary series of rank one semisimple groups

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### DOI

We explicitly construct a finite number of discrete components in the restriction of complementary series representations of rank one semisimple groups $G$ to rank one subgroups $G_1$. For this we use the realizations of complementary series representations of $G$ and $G_1$ on Sobolev spaces on the nilpotent radicals $N$ and $N_1$ of the minimal parabolics in $G$ and $G_1$, respectively. The groups $N$ and $N_1$ are of H-type and we construct explicitly invariant differential operators between $N$ and $N_1$. These operators induce the projections onto the discrete components.
Our construction of the invariant differential operators is carried out uniformly in the framework of H-type groups and also works for those H-type groups which do not occur as nilpotent radical of a parabolic subgroup in a semisimple group.
Original language English Journal of Geometric Analysis 26 1 118-142 25 1050-6926 https://doi.org/10.1007/s12220-014-9540-z Published - 2016

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