QUANTUM CORRECTIONS IN 2-DIMENSIONAL NONSUPERSYMMETRIC HETEROTIC STRINGS

We study quantum corrections for a family of 24 nonsupersymmetric hete rotic string in two dimensions. We compute their genus-two cosmologica l constant using the hyperelliptic formalism and the genus-one two-poi nt functions for the massless states. From here we get the mass correc tions to the states in the massless sector and discuss the rob of the infrared divergences that appear in the computation. We also study som e tree level aspects of these theories and find that they are classifi ed not only by the corresponding Niemeier lattice but also by their hi dden right-moving gauge symmetry.