Sujeito Psíquico e Sujeito Lingüístico: uma introdução à psicopatologia aplicada à fonoaudiologia

Dynamic scaling in the vicinity of the Luttinger liquid fixed point

“…Here we have presented a functional RG calculation of a momentum-and frequency-dependent correlation function of a non-trivial quantum mechanical many-body system. For a special two-dimensional system a similar calculation has recently been performed by Ferraz [16], who used the field theory RG. We believe that the method described in this work will also be useful to study other problems where no exact solutions are available.…”

“…Surprisingly, the problem of calculating the spectral function of a strongly correlated fermionic system like the TLM via RG methods has not received much attention. In fact, with the exception of the recent work by Ferraz [16], where the spectral function of a special two-dimensional Fermi system has been calculated by means of the field theory RG, we are not aware of any RG calculation of the spectral line shape of a strongly correlated fermionic many-body system. Note that in order to obtain a non-trivial k-and ω-dependence and the anomalous scaling properties given in equation (1.6), one should retain infinitely many couplings which are irrelevant by naive power counting.…”