- #1
metroplex021
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I have a question on quantities that 'run' under the renormalization group flow. What's clear is that the properties through which particles couple -- such as charge, isospin, color etc -- change in their strengths as the energy increases. But this running is also true of the mass, which is a property that particles have even when they're not interacting. However, the other properties that we can define in a free field theory -- spin and parity, say -- don't change under the RG flow. So what is it about the kinematical property of mass in particular that allows us to treat it as a coupling?
(A weird question I know, but I'd be interested to hear any thoughts!)
(A weird question I know, but I'd be interested to hear any thoughts!)