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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeApr 25th 2011

    added to orientifold some basic notions on orientifold circle nn-bundles.

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeApr 25th 2011

    have added more details on the Jandl-gerbe model and its relation to the DFM-model.

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeApr 4th 2014

    I have rewritten the first paragraphs of orientifold and removed some of the technical discussion that I had there. Will write an improved version these days.

    • CommentRowNumber4.
    • CommentAuthorUrs
    • CommentTimeOct 2nd 2018

    Have expanded the list of references. In particular I added pointer to Hanany-Kol 00, which, as I just discovered, gives on its p 11 a lightning sketch of the classification of those pp-brane involutions in Prop. 4.7 of our “Real ADE-equivariant (co-)homotopy

    diff, v42, current

    • CommentRowNumber5.
    • CommentAuthorUrs
    • CommentTimeMay 12th 2019
    • (edited May 12th 2019)

    added pointer to this reference:

    (didn’t realize before that Ron Maimon has such a publication – or maybe I am misidentifying the author?)

    Also slightly re-arranged the references, putting all the M-theory lifts into their own subsection

    diff, v55, current

    • CommentRowNumber6.
    • CommentAuthorUrs
    • CommentTimeMay 12th 2019

    (whether it’s him or not, it’s fun getting distracted from googling his online writings; here he explains that the orgies at Harvard are “not done well”, in contrast to those at Cornell, and why)

    • CommentRowNumber7.
    • CommentAuthorUrs
    • CommentTimeMay 16th 2019

    added pointer to today’s

    diff, v62, current

    • CommentRowNumber8.
    • CommentAuthorUrs
    • CommentTimeMar 18th 2020

    I wrote a section (here) on orientifold backreaction (or not), with some discussion of and quotes from the literature.

    diff, v80, current

    • CommentRowNumber9.
    • CommentAuthorUrs
    • CommentTimeSep 8th 2020

    added pointer to:

    diff, v86, current

    • CommentRowNumber10.
    • CommentAuthorUrs
    • CommentTimeSep 18th 2020

    added publication data to:

    diff, v87, current

    • CommentRowNumber11.
    • CommentAuthorperezl.alonso
    • CommentTimeOct 20th 2023

    But isn’t there a concrete definition as for orbifold in orbifold groupoid? Of the resources I’ve checked out (which are admittedly not many) they just “define” them in terms of what they’re supposed to do.

    • CommentRowNumber12.
    • CommentAuthorUrs
    • CommentTimeOct 20th 2023

    Absolutely: If a direct /2\mathbb{Z}/2-factor in the equivariance group is singled out as on the bottom of p. 32 here — and if that /2\mathbb{Z}/2 acts by “Real involution” on whatever cohomology coeffcients one has— then its fixed loci are the orientifolds.