Indications of a Pseudogap in the Nambu Jona-Lasinio model
  The survival of \bar q q bound states at temperatures higher than the chiral restoration temperature, T_c, recently observed in lattice QCD, is discussed in the framework of the Nambu Jona-Lasinio model. The perturbative determination of the spectral function provides an indication of a pseudogap phase above T_c. 
Paolo Castorina, Giuseppe Nardulli, Dario Zappala'