Time dependence of expectation values

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MIT 8.04 Quantum Physics I, Spring 2016
Instructor: Barton Zwiebach

License: Creative Commons BY-NC-SA
  1. MIT OpenCourseWare
  2. time dependence
  3. expectation value
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Комментарии
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Note that this assumes that the operator does not have a time dependence

renrenhamster
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I have a question: Why does he think that Φ(k) does not explicitly depend on time, i.e., it should not be written as Φ(k, t)?

Iceyer-suet
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At 1:03 ; I suppose the teacher assumes that Q has not time dependance...

lumpi
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Operators in the Schrödinger Picture can only have explicit time dependence and are usually assumed to be time independent. Only exception being the time-evolution operator as it serves a very different function from other operators. That I think is why he assumes a time independent Q.

BernardBernouli
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Why does H lose its hat in the commutator? Is it no longer an operator?

gregorybuckareff
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but at 1:30 how does he assume dt and Q commute?

nicktohzyu