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The Atiyah algebroid of the path fibration over a Lie group

Meinrenken, E.
Published in Letters in Mathematical Physics. 2009, vol. 90, no. 1-3, p. 23-58
Abstract Let G be a connected Lie group, LG its loop group, and PG->G the principal LG-bundle defined by quasi-periodic paths in G. This paper is devoted to differential geometry of the Atiyah algebroid A=T(PG)/LG of this bundle. Given a symmetric bilinear form on the Lie algebra g and the corresponding central extension of Lg, we consider the lifting problem for A, and show how the cohomology class of the Cartan 3-form on G arises as an obstruction. This involves the construction of a 2-form on PG with differential the pull-back of the Cartan form. In the second part of this paper we obtain similar LG-invariant primitives for the higher degree analogues of the Cartan form, and for their G-equivariant extensions.
arXiv: 0810.4402
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ALEKSEEV, Anton, MEINRENKEN, E. The Atiyah algebroid of the path fibration over a Lie group. In: Letters in Mathematical Physics, 2009, vol. 90, n° 1-3, p. 23-58. https://archive-ouverte.unige.ch/unige:8498

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Deposited on : 2010-07-01

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