Computation of Orbifold Index by Fixed Point Theorems

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概要

We investigate the independent chiral zero modes on the orbifolds from fixed point theorems. The required information for this calculation includes the fixed points of the orbifold and the manner in which the spatial symmetries act on these points, unlike previous studies that necessitated the calculation of zero modes. Since the fixed point theorems can be applied to any fermionic theory on any orbifold, it allows us to determine the index even on orbifolds where the calculation of zero modes is challenging or in the presence of non-trivial gauge configurations. We compute the indices on the T2 and

T4 orbifolds as examples. Furthermore, we also attempt to compute the indices on a Coxeter orbifold related to the D4 lattice.