RENORMALIZATION-GROUP AND THE FERMI-SURFACE IN THE LUTTINGER MODEL

The exactly soluble Luttinger model can also be analyzed from the point of view of the renormalization group. A perturbation theory of the beta function of the model is derived. We argue that the main terms of the beta function vanish identically if the anomalous dimension is properly treated and if suitable properties of the exact solution are taken into account. Our treatment is purely perturbative and we do not discuss the problems of convergence of the formal series defining the beta function: it has recently been established, however, that the series defining it is convergent.