  We discuss the origin of charge density wave (CDW) and spin density wave
(SDW) in p-wave, d-wave and f-wave superconductors. To describe the low-energy
quasiparticle excitation of p-wave case, we introduce a two- (one for time and
one for space) dimensional massless Dirac model. After the non-Abelian
bosonization is performed, the charge and spin density waves emerge from the
model. By using this scheme, we try to explain the characteristic aspect of
phase diagrams of various compounds, oxides and organic superconductors. The
purpose of this paper is to make an argument that the dimensionality of the
nodal excitation in superconductors plays an important role in the
determination of the structure of the phase diagram.
