2004/09/02 by G. Benfatto, Giuseppe Benfatto, V. Mastropietro +1 · 63 citations
Physics and Astronomy · #Anomaly (physics) #Cutoff #Fermion #Gauge theory #Ising model #Luttinger liquid #Physics of Superconductivity and Magnetism #Quantum #Quantum field theory #Quantum many-body systems #Renormalization group #Topological Materials and Phenomena #cond-mat.other
paper · pdf · doi:10.1007/s00220-005-1364-z
published in Communications in Mathematical Physics 258(3), 609-655 (Springer Science+Business Media)
arxiv created 2004/09/02 · openalex publication_date 2005/06/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Systems of interacting non relativistic fermions in d=1, as well as spin chains or interacting bidimensional Ising models, verify an hidden approximate Gauge invariance which can be used to derive suitable Ward identities. Despite the presence of corrections and anomalies, such Ward identities can be implemented in a Renormalization Group approach and used to exploit nontrivial cancellations which allow to control the flow of the running coupling constants; in particular this is achieved combining Ward identities, Dyson equations and suitable correction identities for the extra terms appearing in the Ward identities, due to the presence of cutoffs breaking the local gauge symmetry. The correlations can be computed and show a Luttinger liquid behavior characterized by non universal critical indices, so that the general Luttinger liquid construction for one dimensional systems is completed without any use of exact solutions. The ultraviolet cutoff can be removed and a Quantum Field Theory corresponding to the Thirring model is also constructed.