  We propose a model for the physics of stripes in antiferromagnets in which
the stripes are described by Luttinger liquids hybridized with
antiferromagnetic domains. Using bosonization techniques we study the model in
the limit where the magnetic correlation length is larger than the inter-stripe
distance and propose an explanation for the commensurate-incommensurate phase
transition seen in neutron scattering in the underdoped regime of La_{2-x} Sr_x
Cu O_4. The explanation is based on a phase to anti-phase domain transition in
the spin configuration which is associated with the transverse motion of the
stripes. Using a non-linear sigma model to describe the antiferromagnetic
regions we conjecture the crystalization of the stripes in the magnetically
ordered phase.
