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Therefore there is no perfect measure of continuous quantity except by means of indivisible continuous quantity, for example by means of a point, and no quantity can be perfectly measured unless it is known how many individual points it contains. And since these are infinite, therefore their number cannot be known by a creature but by God alone, who disposes everything in number, weight, and measure. (Robert Grosseteste, 13-й век, цитировано по книге J. Jauch, Foundations of Quantum Mechanics).

Универсальный подход. Например:

"Нет никакого способа придать смысл фейнмановскому интегралу, кроме как через теорию возмущений. Но так как ряд теории возмущений состоит из бесчисленного множества фейнмановских диаграм, бесконечное подмножество которых требует перенормировки, ни один смертный не в состоянии просуммировать этот ряд, и точные функции Грина могут быть вычислены только Господом Богом, для которого нет разницы между перенормируемыми, неперенормируемыми, и суперперенормируемыми теориями поля, и который одинаково легко постигает суперсимметричные и несуперсимметричные модели."



(no subject)

Date: 2009-06-13 08:07 pm (UTC)

(no subject)

Date: 2009-06-16 07:59 am (UTC)
From: [identity profile] chaource.livejournal.com
I thought there was an algebraic approach to QFT that does not require path integrals but is instead constructive. I.e. it provides the correct operator algebra and the representations of the operators in the correct Hilbert space, without going through perturbation theory. But I also thought that this approach has not yet been fully formulated in the literature (e.g. for some realistic theories like QED/QCD) and also that this approach is not able to provide computational results as usually done through the path integral approach + renormalization voodoo. Is this correct?

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