H. Grosse et al., TOPOLOGICALLY NONTRIVIAL FIELD CONFIGURATIONS IN NONCOMMUTATIVE GEOMETRY, Communications in Mathematical Physics, 178(2), 1996, pp. 507-526
In the framework of noncommutative geometry we describe spinor fields
with nonvanishing winding number on a truncated (fuzzy) sphere. The co
rresponding field theory actions conserve all basic symmetries of the
standard commutative version (space isometries and global chiral symme
try), but due to the noncommutativity of the space the fields are regu
larized and they contain only a finite number of modes.