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A couple of questions about this paper, which, unfortunately, I can't access in is entirety
http://link.springer.com/article/10.1007/BF02923262#page-1
1) Re: optical coordinates. From what I've read (here and some other sketchy sources), these are similar to fermi-normal coordinates, but one uses an affine parameterization along null geodesics passing through a point, rather than affine parameterizations along spacelike geodesics at a point. I was wondering if there was anyone out there who could tell me if I was on the right track here.
2) I'm rather curious about the bouncing-photon idea, which apparently can apparently do fermi-walker transport, but I haven't been able to find enough on the idea to figure it out.
http://link.springer.com/article/10.1007/BF02923262#page-1
1) Re: optical coordinates. From what I've read (here and some other sketchy sources), these are similar to fermi-normal coordinates, but one uses an affine parameterization along null geodesics passing through a point, rather than affine parameterizations along spacelike geodesics at a point. I was wondering if there was anyone out there who could tell me if I was on the right track here.
2) I'm rather curious about the bouncing-photon idea, which apparently can apparently do fermi-walker transport, but I haven't been able to find enough on the idea to figure it out.