  There is growing experimental and theoretical evidence that very clean two
dimensional electron systems form unidirectional charge density waves (UCDW) or
``striped'' states at low temperatures and at Landau level filling fractions of
the form nu = M + x with 4 < M < 10 an integer and 0.4 < x < 0.6. Following
previous work, we model the striped state using a Hartree-Fock approach. We
construct the low energy excitations of the system by making smooth
deformations of the stripe edges analogous to the construction of edge state
excitations of quantum Hall droplets. These low energy excitations are
described as a coupled Luttinger liquid theory, as discussed previously by
MacDonald and Fisher (PRB61 5724 2000). Here, we extend that work and
explicitly derive all of the parameters of this low energy theory using a
Hartree Fock approach. We also make contact with the equivalent low energy
hydrodynamic approach of Fogler and Vinokur (PRL84 5828 2000) and similarly
derive the parameters of this theory. As examples of the use of these results,
we explicitly calculate the low-energy excitation spectrum and study tunneling
into the striped state.
