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George Keeling's latest activity
George Keeling
replied to the thread
I
When and why can ∂p/∂t=0 in position space?
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The problem from the book (post #7) asked to show something about $$\frac{d}{dt}\left\langle x p\right\rangle$$so I suppose that means...
May 11, 2024
George Keeling
replied to the thread
I
When and why can ∂p/∂t=0 in position space?
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I think the problem is due to the hats in the expectation value expression. In my book one normally has no hats: ##\left\langle...
May 10, 2024
George Keeling
reacted to
Haborix's post
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When and why can ∂p/∂t=0 in position space?
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Ha! You are perfectly polite. I think the Schrodinger picture only make the issue simple if the derivative with respect to time is just...
May 10, 2024
George Keeling
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DrClaude's post
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When and why can ∂p/∂t=0 in position space?
with
Informative
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If there is not explicit time dependence, then the operator is independent of time.
May 8, 2024
George Keeling
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pines-demon's post
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When and why can ∂p/∂t=0 in position space?
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This is problem 3.37 from the 3ed: The time derivative is outside the angle brackets in Eq. (3.112). Note that it says that for a...
May 8, 2024
George Keeling
replied to the thread
I
When and why can ∂p/∂t=0 in position space?
.
That's exactly what I was doing so that makes ##\left\langle\frac{\partial}{\partial t}\left(\hat{x}\hat{p}\right)\right\rangle=0## I...
May 8, 2024
George Keeling
replied to the thread
I
When and why can ∂p/∂t=0 in position space?
.
To begin with I thought you meant politeness conventions and I had offended you :cry: But on further reflection I think you mean...
May 8, 2024
George Keeling
reacted to
Haborix's post
in the thread
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When and why can ∂p/∂t=0 in position space?
with
Informative
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It is fine to disagree, but it puts you at odds with standard conventions.
May 8, 2024
George Keeling
replied to the thread
I
When and why can ∂p/∂t=0 in position space?
.
So I think what you are saying is that the 'interesting term' should be $$-i\hbar\left[\frac{\partial}{\partial...
May 7, 2024
George Keeling
replied to the thread
I
When and why can ∂p/∂t=0 in position space?
.
Mine is the third edition. We get to ##\left\langle\frac{\partial}{\partial t}\left(\hat{x}\hat{p}\right)\right\rangle=0## after using...
May 7, 2024
George Keeling
posted the thread
I
When and why can ∂p/∂t=0 in position space?
in
Quantum Physics
.
I'm doing Griffiths & Schroeter Problem 3.37 and I would like to prove that the expectation value of a rather peculiar observable...
May 7, 2024
George Keeling
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martinbn's post
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Infinite momentum is impossible, boundary term in integration by parts
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Except for the identically zero function.
Mar 22, 2024
George Keeling
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Infinite momentum is impossible, boundary term in integration by parts
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Thanks! I did miss that. In the 3rd edition it's on page 14, note 15. Slightly new question: is a function square integrable if and...
Mar 22, 2024
George Keeling
reacted to
DrClaude's post
in the thread
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Infinite momentum is impossible, boundary term in integration by parts
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Like
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In the 2nd ed., it is footnote 12 on page 14, in relation to eq. (1.26).
Mar 22, 2024
George Keeling
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I
Infinite momentum is impossible, boundary term in integration by parts
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I have the third edition. Did I miss that? Where does Griffiths write it?
Mar 21, 2024
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