Bosonic description of a Tomonaga-Luttinger model with impurities

We extend a recently proposed non-local version of Coleman's equivalence be tween the Thirring and sine-Gordon models to the case in which the original fermion fields interact with fixed impurities. We explain how our results can be used in the context of one-dimensional strongly correlated systems ( the so called Tomonaga-Luttinger model) to study the dependence of the char ge-density oscillations on the range of the fermionic interactions. (C) 199 9 Published by Elsevier Science B.V. All rights reserved.