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Mar 2, 2017 at 6:51 vote accept anon
Feb 27, 2017 at 0:02 comment added Everett You This non-analyticity simply means that the boson is gapless.
Feb 26, 2017 at 20:43 comment added anon @Everett, does this nonanalyticity have any implication? I believe analyticity is guaranteed at all other Matsubara points, both bosonic and fermionic.
Feb 26, 2017 at 17:38 comment added AccidentalFourierTransform would it be accurate to say that any system without mass-gap has a singularity at ω=0?
Feb 26, 2017 at 17:19 history answered Everett You CC BY-SA 3.0