Volume of Seifert representations for graph manifolds and finite covers

Seifert volume is a topological invariant for closed orientable 3-manifolds. It is introduced by Brooks and Goldman as a generalization of the simplicial volume. In this talk, I will discuss some recent progress on this invariant for graph manifolds, and in particular, an effective formula that allows one to compute the volume of any representation into the motion group of the Seifert geometry. This is joint work with Pierre Derbez and Shicheng Wang.