Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-04-08
Phys.Rev.D78:017502,2008
Physics
High Energy Physics
High Energy Physics - Lattice
4 pages, 1 figure
Scientific paper
10.1103/PhysRevD.78.017502
Fermions moving in a two-dimensional honeycomb lattice (graphene) have, at low energies, chiral symmetry. Generalizing this construction to four dimensions potentially provides fermions with chiral symmetry and only the minimal fermion doubling demanded by the Nielsen-Ninomiya no-go theorem. The practical usefulness of such fermions hinges on whether the action has a necessary set of discrete symmetries of the lattice. If this is the case, one avoids the generation of dimension three and four operators which require fine tuning. We construct hyperdiamond lattice actions with enough symmetries to exclude fine tuning; however, they produce multiple doublings. The limit where the actions exhibit minimal doubling does not possess the requisite symmetry.
Bedaque Paulo F.
Buchoff Michael I.
Tiburzi Brian C.
Walker-Loud Andre
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