Physics Help Forum How do you cancel the bare mass and the correction out? (Renormalisation)

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 Jul 22nd 2017, 12:02 PM #1 Junior Member   Join Date: Jul 2017 Posts: 2 How do you cancel the bare mass and the correction out? (Renormalisation) mass experimental = m + c^2correction. How do you cancel the two out to get the physical mass?
Jul 22nd 2017, 02:09 PM   #2
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 Originally Posted by Cedobor mass experimental = m + c^2correction. How do you cancel the two out to get the physical mass?
As far as I know, the "physical mass" is the experimental mass. What do you think those terms mean. Knowing that can help me answer your question.

Jul 22nd 2017, 02:13 PM   #3
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 Originally Posted by Pmb As far as I know, the "physical mass" is the experimental mass. What do you think those terms mean. Knowing that can help me answer your question.
Hi someone gave an analogy
"Let x = 4 + 1/r − 1/r
If you are going to assign a value to x at r=0, what would that value be? Does it matter that 1/r is infinite?" With the 4+1/r being the bare mass and the 1/r being the correction in this case would it matter if it's changed to x = 4 +1/w - 1/r where I've simply changed the letter representing a value?

Jul 22nd 2017, 03:12 PM   #4
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 Originally Posted by Cedobor Hi someone gave an analogy "Let x = 4 + 1/r − 1/r If you are going to assign a value to x at r=0, what would that value be? Does it matter that 1/r is infinite?" With the 4+1/r being the bare mass and the 1/r being the correction in this case would it matter if it's changed to x = 4 +1/w - 1/r where I've simply changed the letter representing a value?
x is undefined when y = 0. But you need to tell me what you're talking about, otherwise I can't help you.

You've stumbled upon one of the major problems in physics today.

I also need to know what you mean by physical mass. In a text in QFT it states that the physical mass is the position of the single-particle pole in the two point function

I need to state here that I never studied QFT and am no expert on QED. However that does not mean that I can't help you.

 Tags bare, cancel, correction, mass, renormalisation

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