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In QTF theory of Schroeder,chapter 13.1 saying:

Just at t=0(t=[itex]\frac{T-T_{c}}{T_{c}}[/itex]),the correlation should decay as power law.

Define the exponent [itex]\eta[/itex] by the formula:

G(x)=[itex]\frac{1}{x^{d-2+\eta}}[/itex]

where d is Euclidien space dimension.

I do not understand why at critical point, the correlation function decay as power law.Please give me a to favour to explain this.

Thank you very much in advance.

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# Why correlation function decay as power law at critical temperature point?

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