  The low energy spin and charge excitations in the 2D Hubbard model near half
filling are analyzed. The RPA spectra derived from inhomoheneous mean field
textures are analyzed. Spin excitations show a commensurate peak at half
filling, incommensurate peaks near half filling, and a broad background typical
of a dilute Fermi liquid away from half filling. Charge excitations, near half
filling, are localized near (0,0), and they occupy a small portion of the
Brillouin Zone, in a way consistent with the existence of a small density of
carriers, and a small Fermi surface. At higher hole densities, they fill the
entire BZ, and can be understood in terms of a conventional Fermi liquid
picture. The results are consistent with the observed features of the
high-T$_c$ superconductors.
