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In this paper we construct the equilibrium states of Dyson's vector-valued hierarchical model with parameter<img src="/fulltext-image.asp?format=htmlnonpaginated&src=GV752633864274J5_html\220_2005_Article_BF01217768_TeX2GIFIE2.gif" border="0" alt="$$c = \sqrt 2$$" /> at low temperatures and describe their large-scale limit. The analogous problems for<img src="/fulltext-image.asp?format=htmlnonpaginated&src=GV752633864274J5_html\220_2005_Article_BF01217768_TeX2GIFIE3.gif" border="0" alt="$$\sqrt 2$$" /> cc<<img src="/fulltext-image.asp?format=htmlnonpaginated&src=GV752633864274J5_html\220_2005_Article_BF01217768_TeX2GIFIE4.gif" border="0" alt="$$\sqrt 2$$" /> were solved in our papers [1] and [2]. In the present case the large-scale limit is similar to the case<img src="/fulltext-image.asp?format=htmlnonpaginated&src=GV752633864274J5_html\220_2005_Article_BF01217768_TeX2GIFIE5.gif" border="0" alt="$$\sqrt 2$$" /> c<2, i.e. it is a Gaussian self-similar field with long-range dependence in the direction orthogonal to and a field consisting of independent Gaussian random variables in the direction parallel with the magnetization. The main difference between the two cases is that now the normalizing factor in the direction of the magnetization contains, beside the square-root of the volume, a logarithmic term too.

The large-scale limit of Dyson's hierarchical vector-valued model at low temperatures. the marginal case $$c = \sqrt 2$$