QFT videos

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Sujet : QFT videos
De : ram (at) *nospam* zedat.fu-berlin.de (Stefan Ram)
Groupes : sci.physics.research
Date : 23. Sep 2023, 15:08:36
Autres entêtes
Organisation : Stefan Ram
Message-ID : <QFT-20230923105045@ram.dialup.fu-berlin.de>
I prefer to learn from books. But videos have two advantages: One
  can watch/listen to them while doing household chores, and one also
  learns the correct English pronunciation of the technical terms.
  So I listened to some videos of QFT lectures by Prof. Susskind.

  However, after about three videos so far, I am rather disappointed.
  I have the impression that Susskind deliberately wants to
  counteract all too flowery gobbledygook with a "don't talk, but
  calculate" approach. I have always found such an approach absurd
  in physics, but especially devastating in teaching. He does some
  math, "We put this in here, and then we get this," "I'm not going
  to say why, I'm just going to do it this way," and then he says,
  "And this is the simplest example of a quantum field." (these are
  all not literal quotations). He doesn't explain what a "quantum
  field" is supposed to be. This doesn't seem very educational to me.

  As an example of an approach that I like (at least according to the
  few pages I have read so far), I would like to mention "Quantum Field
  Theory" by Mark Srednicki (which is a written text, not a video).
  He first explains that it is about combining quantum mechanics and
  relativity. In order to do this, space and time must be treated
  "on an equal footing at the outset". In quantum theory, time is a
  label (parameter), location is an operator. So to treat them equally,
  one can either treat location as a label, or one can treat time as
  an operator, says Srednicki. Since the second is a bit complicated
  (Srednicki says it would lead to string theory), Srednicki follows
  the way to make the location a label. Each location x is associated
  with an operator phi(x). And this is a quantum field.

  So Srednicki first explains what requirements a quantum field
  should satisfy and why, and then he shows how these requirements
  can be satisfied, so that one can grasp the concepts. Susskind
  lacks such an explanation (though I have not seen all the
  videos in the series, so I may be missing something).

[[Mod. note -- It would be useful to have references to the specific
videos and books under discussion.  -- jt]]

Date Sujet#  Auteur
23 Sep 23 o QFT videos1Stefan Ram

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