Hadrons and QCD instantons: A bosonized view

In a dilute system of installions and antiinstantons, the U_A(1) and scale anomalies are shown to be directly related to the bulk susceptibility and compressibility of the system. Using 1/N_c (where N_c is the number of colors) as a book-keeping argument, mesonic, baryonic and gluonic correlators are worked out in p-space and Fourier transformed to x-space for a comparison with recently simulated correlators. The results are in over-all agreement with simulations and lattice calculations, for distances up to 1.5 fm, despite the fact that some channels lack the necessary physical singularities. We analyze various space-like form factors of the nucleon and show that they are amenable to constituent quark form factors to leading order in 1/N_c. Issues related to the lack of confinement in the model and its consequence on the various correlation functions and form factors are also discussed.