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In Zee's "Nutshell QFT" (chapter V.7) or Shifman's book "Avanced Topics in QFT" (section 10) when they talk about vortices, they claim:
if [itex]\phi(r,\theta)[/itex] goes to [itex]\nu[/itex]exp( i[itex]\theta[/itex]) as r goes to infinity
then [itex]\partial_{i}[/itex][itex]\phi[/itex] becomes [itex]\nu[/itex](1/r)
I do not see how? Is the phase equal to 1/r if r goes to r?
thank you
if [itex]\phi(r,\theta)[/itex] goes to [itex]\nu[/itex]exp( i[itex]\theta[/itex]) as r goes to infinity
then [itex]\partial_{i}[/itex][itex]\phi[/itex] becomes [itex]\nu[/itex](1/r)
I do not see how? Is the phase equal to 1/r if r goes to r?
thank you
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