In lattice field theory, fermion doubling occurs when naively putting fermionic fields on a lattice, resulting in more fermionic states than expected. For the naively discretized Dirac fermions in d {\displaystyle d} Euclidean dimensions, each fermionic field results in 2 d {\displaystyle 2^{d}} identical fermion species, referred to as different tastes of the fermion.
In lattice field theory, fermion doubling occurs when naively putting fermionic fields on a lattice, resulting in more fermionic states than expected. For the naively discretized Dirac fermions in d {\displaystyle d} Euclidean dimensions, each fermionic field results in 2 d {\displaystyle 2^{d}} identical fermion species, referred to as different tastes of the fermion.
Source: Wikipedia "Fermion doubling" · CC BY-SA 4.0
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