Equivariant Prequantization

  • R. Lashof
Part of the Mathematical Sciences Research Institute Publications book series (MSRI, volume 20)


If (S, ω) is a symplectic manifold, a prequantization of S is a principal circle bundle over S together with a connection form whose curvature is −ω. Such a circle bundle exists iff the period group of ω is contained in ℤ; i.e., the class [ω] ∈ H 2(S, ℝ) comes from an integral class. If S is simply connected it follows from the universal coefficient theorem that the integral class is unique. Also note that for simply connected S, the period group of ω is in ℤ iff the spherical period group is in ℤ; i.e., π 2(S) ≅ H 2(S).1 If S is not simply connected it may have inequivalent prequantizations. Inequivalent prequantizations of S also induce inequivalent prequantizations of S × \(\bar S\), \(\bar S\) denoting (S, −ω). But one can show such prequantizations become equivalent when pulled back to the fundamental groupoid (\(\pi \left( S \right) = \tilde S \times \tilde S/{\pi _1}\left( S \right),\lambda :\tilde S \to S\) the universal cover, with the form induced from S × \(\bar S\) by λ × λ). Further if we only assume ω is integral on spherical classes, no prequantization may exist. In his preprint [10], Alan Weinstein gives a method for prequantizing the fundamental groupoid of a symplectic manifold (S, ω) when ω is integral on spherical classes, using connection theory. His result is equivalent to the statement (Corollary 1.3): For any symplectic manifold (S, ω) the period group of the fundamental groupoid π(S) is contained in ℤ iff the spherical period group of S is contained in ℤ. Since this is a statement about cohomology, Weinstein raises the question of giving a purely algebraic topology proof of this result.


Spectral Sequence Symplectic Manifold Connection Form Maximal Compact Subgroup Period Group 
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Copyright information

© Springer-Verlag New York, Inc. 1991

Authors and Affiliations

  • R. Lashof
    • 1
  1. 1.University of California at BerkeleyBerkeleyUSA

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