The critical temperature Tc(n,d) of a classical n‐component spin model with a general continuous spin distribution on a d‐dimensional hypercubic lattice is expanded in inverse powers of d to order 1/d3. The general result differs significantly from the special case of fixed spin length owing to changes in the graphical structure of the high temperature expansion. In the limit n→0 the model becomes identical to the general self‐interacting random walk or polymer problem: The Boltzmann factors for self‐intersections in the walks correspond to the moments of the spin distribution functions, and Tc(0,d) yields the polymer free energy.
REFERENCES
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We acknowledge correspondence with D. Stauffer raising this point.
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See, e.g.,
M. E.
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and B. J.
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For graph theory terminology see
J. W.
Essam
and M. E.
Fisher
, Rev. Mod. Phys.
42
, 271
(1970
).
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© 1975 American Institute of Physics.
1975
American Institute of Physics
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