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Proceedings of the London Mathematical Society Advance Access originally published online on September 10, 2007
Proceedings of the London Mathematical Society 2008 96(1):78-106; doi:10.1112/plms/pdm030
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© 2007 London Mathematical Society

Generalized string topology operations

Kate Gruher

Department of Mathematics
Stanford University
Stanford, CA 94305
USA

Paolo Salvatore

Dipartimento di matematica
Università di Roma ‘Tor Vergata’
00133 Roma
Italy
salvator{at}mat.uniroma2.it

Received 2 March 2006. Revision received 7 February 2007.

We show that the Chas–Sullivan loop product, a combination of the Pontrjagin product on the fiber and the intersection product on the base, makes sense on the total space homology of any fiberwise monoid E over a closed oriented manifold M. More generally, the Thom spectrum E–TM is a ring spectrum. Similarly, a fiberwise module over E defines a module over E–TM. Fiberwise monoids include adjoint bundles of principal bundles, and the construction is natural with respect to maps of principal bundles. This naturality implies homotopy invariance of the algebra structure on H*(LM) arising from the loop product. If M=BG is the infinite-dimensional classifying space of a compact Lie group, then we get a well-defined pro-ring spectrum, which we define to be the string topology of BG. If E has a fiberwise action of the little n-cubes operad then E–TM is an En-ring spectrum. This gives homology operations combining Dyer–Lashof operations on the fiber and the Poincaré duals of Steenrod operations on the base. We give several examples where the new operations give homological insight, borrowed from knot theory, complex geometry, gauge theory, and homotopy theory.

2000 Mathematics Subject Classification 55R35, 57R19, 55R70, 55P43, 55S12.

The first author was supported by a National Defense Science and Engineering Graduate Fellowship.


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