Fermion Doubling

Fermion Doubling

The fermion doubling problem is a problem that is encountered when naively trying to put fermionic fields on a lattice. It consists in the appearance of spurious states, such that one ends up having 2d fermionic particles (with d the number of discretized dimensions) for each original fermion. In order to solve this problem, several strategies are in use, such as Wilson fermions and staggered fermions.

Read more about Fermion Doubling:  Mathematical Overview, The Nielsen–Ninomiya Theorem

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