Local quantum field theory (QFT) provides a framework for establishing the non-perturbative constraints imposed on QFTs at non-vanishing temperatures. In this talk I will outline how the locality of fields in particular has significant implications for the spectral properties of finite-temperature QFTs, including the description of peak-broadening effects experienced by particles as they move through a thermal medium. As an application, I will discuss the calculation of the shear viscosity arising from thermal pion states.
Webinar at https://us02web.zoom.us/j/81572103194?pwd=eE1QVWZFc1hWbWszZ2N0RW1iWHFBZz09