Field Theory in 2+ Dimensions and Critical Dimension in the String Model. II
Y. Chikashige, Yasunori Fujii · Progress of Theoretical Physics · 1977
The critical dimension in the string model is analysed in terms of the field theory in the two-dimensional Minkowski space-time which is obtained by transforming the basic variables τ and σ. It is proposed to allow the dimensionality of this internal space-time to be continuous and go to the limit of two dimensions. The theory is then invariant under the Lorentz transformation in our ordinary space-time with any dimensionality including the realistic value four.