Re: How real are the "Virtual" partticles?

From: Arnold Neumaier (Arnold.Neumaier_at_univie.ac.at)
Date: 03/29/05 

Date: Tue, 29 Mar 2005 17:16:29 +0000 (UTC)

Eugene Stefanovich wrote:

> Arnold Neumaier wrote:
>
>>Eugene Stefanovich wrote:
>>
>>>Suppose that you are right and all these fancy methods can indeed
>>>describe the time evolution. Then I would like to ask a question.
>>>Why straightforward quantum formula exp(iHt) does not work in
>>>QFT? Why do we need to go such length to invent substitutes for
>>>this simple and transparent operator?
>>
>>Because H is _defined_ by a limiting process involving renormalization.
>
> Then there is a clear benefit in using the dressed particle Hamiltonian
> which is defined by explicit formula as mandated by quantum mechanics.

There are other approaches who take the limit later than you do, and
hence save lots of calculations.

You'd give up praising your approach as having a unique advantage.

Arnold Neumaier

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