In superfluids, there is a field B *, related to superfluid vorticity, which is mathematically analogous to the magnetic B -field. Because of the similarity, the field B * is called a "synthetic magnetic field". In January 2014, it was reported that monopole quasiparticles for the B * field were created and studied in a spinor Bose–Einstein condensate. This constitutes the first example of a quasi-magnetic monopole observed within a system governed by quantum field theory.