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The enhancement of the scalar-isoscalar spectral function near the two-pionthreshold is studied in the framework of an effective linear $\sigma$ model,using a large N approximation in the number of the Goldstone bosons. The effectis rather insensitive to the detailed T=0 characteristics of the $\sigma$ pole,it is accounted by a pole moving with increasing $T$ along the real axis of thesecond Riemann sheet towards the threshold location from below.Comment: 5 pages, poster presented at SEWM2002, Heidelberg, October 200

THE SCALAR-ISOSCALAR SPECTRAL FUNCTION OF STRONG MATTER IN A LARGE N APPROXIMATION