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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeMay 4th 2022

    starting something, so far some paragraphs of an Idea-section (references to follow in a moment).

    v1, current

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeMay 4th 2022

    some references added and Idea section expanded a little more.

    v1, current

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeMay 5th 2022
    • (edited May 5th 2022)

    added pointer to

    • Dan-Wei Zhang, Y. X. Zhao, Rui-Bin Liu, Zheng-Yuan Xue, Shi-Liang Zhu, Z. D. Wang, Quantum simulation of exotic PT-invariant topological nodal loop bands with ultracold atoms in an optical lattice, Phys. Rev. A 93 (2016) 043617 (arXiv:1601.00371, doi:10.1103/PhysRevA.93.043617)

    These authors stand out as mentioning (II.A) the KO-theory relevant for “time-reversal + inversion”-symmetric semi-metals.

    diff, v2, current

    • CommentRowNumber4.
    • CommentAuthorUrs
    • CommentTimeMay 17th 2022

    I have added a section “Phase decay via mass terms” (here) with

    a quick review of the folklore

    a new illustrating graphics

    a few new references.

    (This is not meant to be the final answer, just a review of what is currently available on this point in the literature.)

    diff, v7, current

    • CommentRowNumber5.
    • CommentAuthorUrs
    • CommentTimeMay 25th 2022

    added pointer to:

    diff, v11, current

    • CommentRowNumber6.
    • CommentAuthorUrs
    • CommentTimeMar 7th 2023

    added pointer to:

    diff, v18, current

    • CommentRowNumber7.
    • CommentAuthorUrs
    • CommentTimeJan 10th 2024

    added pointer to today’s

    • Faruk Abdulla, Ganpathy Murthy, Ankur Das, Stable nodal line semimetals in the chiral classes in three dimensions [arXiv:2401.02966]

    diff, v21, current