Classification of Irreducible Weight Modules with a Finitedimensional Weight Space over Twisted HeisenbergVirasoro Algebra

We show that the support of an irreducible weight module over the twisted Heisenberg Virasoro algebra, which has an infinitedimensional weight space, coincides with the weight lattice and that all nontrivial weight spaces of such a module are infinite dimensional. As a corollary, we obtain that every irreducible weight module over the twisted HeisenbergVirasoro algebra, having a nontrivial finitedimensional weight space, is a HarishChandra module (and hence is either an irreducible highest or lowest weight module or an irreducible module from the intermediate series)