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Apr 8, 2019 at 12:14 comment added Gabriel Golfetti I applied this and worked out the expectation value of the commutator on the state $|\mathbf p\rangle=a^\dagger(\mathbf p)|0\rangle$ and got a nonvanishing $x-y$ dependence. Thanks!
Apr 8, 2019 at 12:12 vote accept Gabriel Golfetti
Apr 7, 2019 at 13:39 history edited Prof. Legolasov CC BY-SA 4.0
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Apr 7, 2019 at 12:56 history edited Prof. Legolasov CC BY-SA 4.0
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Apr 7, 2019 at 9:13 history answered Prof. Legolasov CC BY-SA 4.0