Linear and nonlinear spectroscopy in the condensed phase

I will describe the use of wavefunction-based techniques in order to calculate the linear and nonlinear optical response of condensed phase materials, including three-dimensional solids and low-dimensional nanostructures. In particular, I will discuss approaches based on equation-of-motion coupled-cluster theory, as well as its relation to the GW approximation for charged excitations and the Bethe-Salpeter equation for neutral excitations.