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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeMay 31st 2011

    I badly need to polish the nnLab entries related to path integrals. Today a student asked me how the pull-push operation in string topology is a remnant of a quantum path integral. So a started writing now

    So far there is the description of the archetypical path integral for the quantum particle propagating on the line in terms of pull-tensor-push.

    • CommentRowNumber2.
    • CommentAuthorzskoda
    • CommentTimeMay 31st 2011

    This is very interesting. The most rich geometric theory of quantization is so far developed for finite-dimensional mechanics. The central role are the cohomological classes related to Lagrangian geometry – most notably the Maslov class. Cohomology is higher categorical subject, so can your approach predict the appearance of the Maslov class ? That would be so interesting.

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeMay 31st 2011

    I haven’t thought much about the Maslov index for a long while. Maybe I should.

    One question: in the entry you have a sentence

    Lagrangean submanifold describes the phase of short-wave oscillations.

    I am not sure what this means.

    • CommentRowNumber4.
    • CommentAuthorzskoda
    • CommentTimeMay 31st 2011
    • (edited May 31st 2011)

    I must have taken this phrase from somewhere. Well, it is roughly like the role of the real submanifold in the Fourier transform. My memory is that here one takes in the sense of the eikonal approximation, which is the splitting into short wave and long wave part and assigning the coordinates to each part. I should write some time an entry on eikonal. I think this is very important for us, as in the cases in which one has topological QFT, the quasiclassical approximations are exact (by localization), hence one is likely to see the connection best by looking at eikonal-like approaches.

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