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The question is given as a practice problem in Poisson's book "Relativists Toolkit" (p. 159, problem #7) along with some helpful hints. The tensor $\gamma_{ab}$ (which is not a tensor at all) must be defined in the following way: Let $h_{ab}$ be the induced 3-metric on the spacelike hypersurface $\Sigma$, and let on its boundary, $\partial \Sigma$, be ...

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In fact there are two different meaning for the term "global anomaly", which is a pity: global anomaly as opposed to gauge anomaly; global gauge anomaly as opposed to local gauge anomaly. An anomaly can arise from global and gauge symmetries. So here global refers to the fact that the symmetry group is not gauged: these symmetries have a physical ...

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Here is a related paper that analyses the same data looking for the connection with Bohmian mechanics. Comment on "Observing the Average Trajectories of Single Photons in a Two-Slit Interferometer" Timothy M. Coffey, Robert E. Wyatt Kocsis et al. (Science, Reports 3 June 2011, p. 1170) state that the experimentally deduced average photon ...

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Within projected augmented wave (PAW) method it is incorrect to use the smooth pseudo wave function directly to obtain integrals. The same applies for ultra-soft pseudo potentials, but I will proceed discussing about PAW. The results can indeed be wrong. For example, for coin-metals, the d-band smooth wave functions $\tilde{\Psi}$ can have norms of 0.2-0.4, ...

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A universal NOT gate would allow deterministic remote state preparation with one classical communication bit. See http://arxiv.org/abs/1505.05615 and references.

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A Universal-Not allows FTL communication I added a Universal-Not gate to my toy circuit simulator and played around with it, trying to find interesting things. I was experimenting with "measuring along the UniversalNot axis" when I stumbled onto this: The left half of the circuit is only varying the global phase, but by the end an observable is varying. ...

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