Projective flatness in the quantisation of bosons and fermions

Details Projective flatness in the quantisation of bosons and fermions Projective flatness in the quantisation of bosons and fermions

2010-08-31

arxiv.org/abs/1008.5333v2

Mathematics

Symplectic Geometry

20 pages, typo and other minor corrections made

Scientific paper

We compare the quantisation of linear systems of bosons and fermions. We recall the appearance of projectively flat connection and results on parallel transport in the quantisation of bosons. We then discuss pre-quantisation and quantisation of fermions using the calculus of fermionic variables. We then define a natural connection on the bundle of Hilbert spaces and show that it is projectively flat. This identifies, up to a phase, equivalent spinor representations constructed by various polarisations. We introduce the concept of metaplectic correction for fermions and show that the bundle of corrected Hilbert spaces is naturally flat. We then show that the parallel transport in the bundle of Hilbert spaces along a geodesic is the rescaled projection or the Bogoliubov transformation provided that the geodesic lies within the complement of a cut locus. Finally, we study the bundle of Hilbert spaces when there is a symmetry.

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