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In the present work we calculate the theoretical tunneling conductance curvesof SIN junctions involving high-Tc superconductors, for different possiblesymmetries of the order parameter (s, d, s+id, s+d, anisotropic s and extendeds). To do so, we solve the real-axis Eliashberg equations in the case of anhalf-filled infinite band. We show that some of the peculiar characteristics ofHTSC tunneling curves (dip and hump at eV > Delta, broadening of the gap peak,zero bias and so on) can be explained in the framework of the Migdal-Eliashbergtheory. The theoretical dI/dV curves calculated for the different symmetries atT=4 K are then compared to various experimental tunneling data obtained inoptimally-doped BSCCO, TBCO, HBCO, LSCO and YBCO single crystals. To best fitthe experimental data, the scattering by non-magnetic impurities has to betaken into account, thus limiting the sensitivity of this procedure indetermining the exact gap symmetry of these materials. Finally, the effect ofthe temperature on the theoretical tunneling conductance is also discussed andthe curves obtained at T=2 K are compared to those given by the analyticalcontinuation of the imaginary-axis solution.Comment: 6 pages, 3 figures, Proceedings of SATT10 Conference, to be published  in Int. J. Mod. Phys.

REAL-AXIS SOLUTION OF ELIASHBERG EQUATIONS IN VARIOUS ORDER-PARAMETER SYMMETRIES AND TUNNELING CONDUCTANCE OF OPTIMALLY-DOPED HTSC