Chiral boson, $W_\infty$-coherent state and edge states in the quantum   Hall effect
  We perform consistently the Gupta-Bleuler quantization combined with Dirac procedure for a chiral boson with the parameter ($\alpha$) on the circle, the boundary of the circular droplet. For $\alpha =1$, we obtain the holomorphic constraints. Using the representation of Bargmann-Fock space and the Schr\"odinger equation, we construct the holomorphic wave functions. In order to interpret these functions, we introduce the $W_\infty$-coherent state to account for the infinite-dimensional translation symmetry for the Fourier (edge) modes. The $\alpha=1$ wave functions explain the neutral edge states for $\nu =1$ quantum Hall fluid very well. In the case of $\alpha = -1$,   we obtain the new wave functions which may describe the higher modes (radial excitations) of edge states. Finally, the charged edge states are described by the $|\alpha| \not=1$ wave functions. 
Y.S. Myung(Inje U.)