Improved BFT quantization of O(3) nonlinear sigma model - art. no. 125005

We newly apply the improved Batalin-Fradkin-Tyutin (BFT) Hamiltonian method to the O(3) nonlinear sigma model, and directly obtain the compact form of a nontrivial first class Hamiltonian by introducing the BFT physical field s. Furthermore, following the Batalin-Fradkin-Vilkoursky formalism, we deri ve the Becci-Rouet-Stora-Tyutin invariant gauge fixed Lagrangian through th e standard path-integral procedure. Finally, by introducing collective coor dinates, we also study a semiclassical quantization of the soliton backgrou nd to conclude that the spectra of zero modes are unchanged through the BFT procedure. [S0556-2821(99)03922-3].