Tensor product weight modules over the affine-Virasoro algebra

In this paper, we study the tensor products of irreducible highest weight modules with irreducible loop modules over the affine-Virasoro algebra with aid of the “shifting technique” established for the Virasoro algebra in [H. Chen, X. Guo and K. Zhao, Tensor product weight modules over the Virasoro algebra, J. Lond. Math. Soc. 88 (2013) 829–844]. All such tensor product modules are indecomposable modules with infinite-dimensional weight spaces. Moreover, we obtain the necessary and sufficient conditions for such tensor product modules to be irreducible. Therefore, we obtain a class of new irreducible weight modules over the affine-Virasoro algebra. Finally, the necessary and sufficient conditions for any two such tensor product modules to be isomorphic are also determined.