STRINGY SPHALERONS AND NON-ABELIAN BLACK-HOLES

Static spherically symmetric asymptotically flat particle-like and black hole solutions are constructed within the SU(2) sector of the four-dimensional heterotic string effective action. They separate topologically distinct Yang-Mills vacua and are qualitatively similar to the Einstein-Yang-Mills sphalerons and non-abelian black holes discussed recently. New solutions possess quantized values of the dilaton charge.