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Apr 4, 2019 at 17:32 comment added Xenomorph @Mtheorist Thank you for the link. I had read that paper.
Apr 4, 2019 at 15:50 comment added Mtheorist A relevant paper - projecteuclid.org/download/pdf_1/euclid.cmp/1104249532
Aug 2, 2018 at 9:15 comment added Xenomorph Hi @ Sunghyuk Park Would you give me some references talking about details of the deformation?
Aug 2, 2018 at 0:29 comment added Henry Moreover, $SL(2,\mathbb{R})$ being contractible to $U(1)$ means that any vector bundle with structure group $SL(2,\mathbb{R})$ can be smoothly deformed to a vector bundle with structure group $U(1)$. Because first Chern classes take discrete values, statements on page 13 about $U(1)$ bundles should carry over immediately to the case of $SL(2,\mathbb{R})$ bundles.
Aug 2, 2018 at 0:13 comment added Henry I guess $SL(2,\mathbb{R})$ Chern-Simons theory should be equivalent to $SL(2,\mathbb{C})$ Chern-Simons theory with structure group restricted to $SL(2,\mathbb{R})$. So given a representation of $SL(2,\mathbb{R})$, we can complexify that representation, and there must be the associated complex vector bundle. Then we can talk about second Chern class, etc.
Aug 1, 2018 at 23:18 history edited Xenomorph CC BY-SA 4.0
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Aug 1, 2018 at 23:11 history asked Xenomorph CC BY-SA 4.0