2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42912We discuss the possibility that in finite density QCD an anisotropic phase is realized. This case might arise for quarks with different chemical potential and/or different masses. In this phase crystalline structures may be formed. We consider this possibility and we describe, in the context of an effective lagrangian, the corresponding phonons as the Nambu-Goldstone bosons associated to the breaking of the space symmetries.LaTex,20 pages, 6 figures. Talk at the International Workshop on QCD: QCD@Work 2003 - Conversano (Italy) 14-18 June 2003 (eConf C030614). Change in the CERN preprint numberHigh Energy Physics - PhenomenologySuperconductivitytext