Title: SUPERCONDUCTIVITY IN THE t-J MODEL
Author(s): N.M.Plakida (Joint Institute for Nuclear Research, 141980 Dubna, Russia)

A comparison of microscopic theories for superconductivity in the limit of strong electron correlations is presented. We consider the results for the two-dimensional $t$-$J$ model obtained within a projection technique for the Green functions in terms of the Hubbard operators and a slave-fermion representation for the RVB state. It is argued that the latter approach resulting in an odd-symmetry $p$-wave pairing for fermions is inadequate.

Key words: strong electron correlations, high-temperature superconductors, Green functions, slave fermions
PACS: 74.20.-z, 74.20.Mn, 74.72.-h