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I am a postdoc in maths with a degree in theoretical physics. I am interested in mathematical structures in quantum field theory and string theory, see here.
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awarded  Nice Question 
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accepted  Diffeomorphisms and homotopy equivalences sliced over BO(n) 
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awarded  Announcer 
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comment 
Diffeomorphisms and homotopy equivalences sliced over BO(n)
Thanks a lot for taking the time to compile this excellent argument. That saves me from walking down a deadend. 
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revised 
Diffeomorphisms and homotopy equivalences sliced over BO(n)
fixed a typo 
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asked  Diffeomorphisms and homotopy equivalences sliced over BO(n) 
Oct 21 
awarded  Announcer 
Oct 21 
awarded  SelfLearner 
Oct 21 
revised 
Extended TFT with coefficients in spans in any $\infty$topos
added 4 characters in body 
Oct 21 
answered  Extended TFT with coefficients in spans in any $\infty$topos 
Oct 20 
awarded  Announcer 
Oct 20 
comment 
Extended TFT with coefficients in spans in any $\infty$topos
I should maybe say that the idea would be to use naturality of the equivalences in the case of $\infty$groupoids to reduce the desired equivalence in the case of general $\mathbf{H}$ to a presheaf of equivalences and then conclude from that. 
Oct 18 
asked  Extended TFT with coefficients in spans in any $\infty$topos 
Oct 15 
comment 
“extended TQFT” versus “TQFT with defects”
Yes, representations of cobordisms with singularities encode TFTs with boundaries and defects. For "prequantum" field theory this is discussed in sections 3.9.14.4 to 3.9.14.6 of arxiv.org/abs/1310.7930 (improved version in preparation at ncatlab.org/schreiber/show/Local+prequantum+field+theory). For quantization of this: arxiv.org/abs/1402.7041 . This is based on discussion with Domenico Fiorenza and Alessandro Valentino that recently appeared as arxiv.org/abs/1409.5723 
Oct 15 
awarded  Yearling 
Oct 13 
awarded  Announcer 
Sep 24 
awarded  Autobiographer 
Sep 15 
comment 
From 3framings on $\Sigma$ to $\mathrm{Spin}^c$structures on $\mathrm{Loc}_G(\Sigma)$?
Chris SchommerPries has kindly pointed out that there should be a positive answer to the second of my questions: the projectively flat Hitchin connection on the Riemann moduli space canonically lifts to a genuinely flat connection on the 3framing moduli space. This follows with a) Segal's deprojectivization, 2) the fact that "Atiyah 2framings" provide "level12 riggings" and 3) the observation (which Chris kindly highlighted) that there is a canonical functor from the 1type of 3framings to that of "Atiyah 2framings" (see ncatlab.org/nlab/show/modular+functor#TopologicalLift). 
Sep 11 
reviewed  Approve suggested edit on homotopy exact sequence for the étale fundamental group 
Sep 10 
comment 
When does a moduli space admit a spin structure?
There are of course moduli spaces which are both important and at the same time are geometrically simple, a key example being the (higher) Jacobians ncatlab.org/nlab/show/intermediate+Jacobian which are simply higher dimensional tori. Hence these even admit a framing and in particular admit whatever Gstructure you want. 