Branching problems of Zuckerman derived functor modules

We discuss recent developments on branching problems of irreducible unitary representations $π$ of real reductive groups when restricted to reductive subgroups. Highlighting the case where the underlying $(g,K)$-modules of $π$ are isomorphic to Zuckerman's derived functor modules $A_q(λ)$, we show various and rich features of branching laws such as infinite multiplicities, irreducible restrictions, multiplicity-free restrictions, and discrete decomposable restrictions. We also formulate a number of conjectures.

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