Constrained Quantization of Charged Strings in Background B Field and g-Factors

The Dirac quantization is performed for the constrained system of the open string with different charges located at both ends in the constant background B field. Noncommutativity reveals to commutators [X, X], [P, P] and also [X,P] at both ends of the string. We consider a dependence on the change of the "cyclotron frequency" of the charged string. The g-factor of the charged string is also calculated in the framework of our formulation.Comment: 21 pages, no figures, LaTe

Closed Superstrings in a Uniform Magnetic Field and Regularization Criterion

We summarize exact solutions of closed superstrings in a constant magnetic field, from a view point of the regularization criterion. Some models will be excluded according to this criterion. The spectrum-generating algebra is also constructed in these interacting models.Comment: 13 pages, No figure