Top Quark Physics

Abstract

In this contribution I review the physics of top quarks at a future Linear Collider. Main emphasis is put on the process e+ e- to ttbar close to threshold. Different physical observables, their sensitivity to the basic parameters and their theoretical prediction are discussed. Recent higher order calculations are shown to have a considerable impact on a precise determination of the top quark mass. It is pointed out how the use of mass definitions different from the pole mass scheme become important in this respect. Continuum top quark production above threshold is discussed briefly.