Physics – Condensed Matter
Scientific paper
1995-05-29
Phys.Lett. B357 (1995) 169-176
Physics
Condensed Matter
17 pages, latex, 3 diagrams using FEYNMAN
Scientific paper
10.1016/0370-2693(95)00876-M
We develop a formalism for performing real space renormalization group transformations of the "decimation type" using perturbation theory. The type of transformations beyond $d=1$ is nontrivial even for free theories. We check the formalism on solvable case of $O(N)$ symmetric Heisenberg chain. The transformation is particularly useful to study asymptotically free theories. Results for one class of such models, the d=2 O(N) symmetric $\sigma$ models ($N\ge 3$) for decimation with scale factor $\eta=2$ (when quarter of the points is left) are given as an example.
Kushnir V.
Rosenstein Baruch
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