Topological Obstruction in Block-spin Transformations

Physics – High Energy Physics – High Energy Physics - Lattice

Scientific paper

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11 pages, latex, no figures

Scientific paper

10.1016/S0370-2693(00)00920-5

Block-spin transformations from a fine lattice to a coarse one are shown to give rise to a one-to-one correspondence between the zero-modes of the Ginsparg-Wilson Dirac operators. The index is then preserved under the blocking process. Such a one-to-one correspondence is violated and the block-spin transformation becomes necessarily ill-defined when the absolute value of the index is larger than 2rN, where N is the number of the sites on the coarse lattice and r is the dimension of the gauge group representation of the fermion variables.

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