Demystifier's latest activity
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Demystifier reacted to Jaime Rudas's post in the thread Graduate Did Stephen Hawking fix his numerical mistake? with
Informative.
I disagree. This text is certainly not a textbook or a peer-reviewed paper, but it can't be considered a pop science book or anything... -
Demystifier replied to the thread Undergrad Necessary conditions for the uncertainty principle.Which, by writing ##q=x##, ##p=y##, becomes the usual quantum mechanical continuity equation. So pre-quantization, at this level, is...
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Demystifier replied to the thread Undergrad Necessary conditions for the uncertainty principle.Nice question and apparent paradox, let me demystify it. To simplify the math I will work in units ##\hbar=1##, so that position and...
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Demystifier reacted to andresB's post in the thread Undergrad Necessary conditions for the uncertainty principle with
Like.
In (1D) quantum mechanics we deal with wavefunctions ##\psi(x)## belonging to ##L^{2}(\mathbb{R}) ##. We then have the position and... -
Demystifier replied to the thread Undergrad Why aren't photons from a laser considered entangled?.When the intensity of the laser beam is very strong, i.e., when the average number of photons is large, then the laser beam can very...
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Demystifier reacted to PeterDonis's post in the thread Undergrad Why aren't photons from a laser considered entangled? with Like.
Wrong. What is emitted by a laser is not a bunch of photons that each have an individual quantum state. The quantum state emitted by a...
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Demystifier reacted to Herman Trivilino's post in the thread Undergrad Why is thermal energy treated differently than other kinds of energy? with Like.
Excellent answer to the OP's question. In principle it is indeed an issue of being practical. Overwhelmingly so.
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Demystifier reacted to Andrew Mason's post in the thread Undergrad Why is thermal energy treated differently than other kinds of energy? with
Agree.
All good points. But I might take a bit of an issue with the suggestion that the statistical methods are just an approximation... -
Demystifier reacted to A.T.'s post in the thread High School Internal energy and gravitation with Like.
Internal energy of the cylinder? No. Internal energy of the cylinder+earth system? Yes.
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Demystifier replied to the thread Undergrad Why is thermal energy treated differently than other kinds of energy?.In principle, we could completely ignore statistical mechanics and thermal energy, and explain everything as you would like, in terms of...
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Demystifier replied to the thread High School Electron absorbs photon, but what happens to the photon?.The QED Hamiltonian determines the time-dependence of the state ##|\psi(t)\rangle##. But once you know ##|\psi(t)\rangle##, you don't...
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Demystifier reacted to Frabjous's post in the thread Quantum mechanics book recommendations with Like.
A couple of popularizations that I like Where does the Weirdness Go by Lindley https://www.amazon.com/dp/0465067867/?tag=pfamazon01-20...
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Demystifier replied to the thread High School Electron absorbs photon, but what happens to the photon?.Yes, but its absolute value squared is not exactly the probability density of photon position.
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Demystifier replied to the thread Today I Learned.What was only Imaginary until recently, now is Real. That is, now I=R. Hence, an anagram of PUTIN is TRUNP.
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Demystifier reacted to Ivan Seeking's post in the thread What did you do with your old college textbooks? with
Sad.
Many years ago, as the internet was coming of age, I burned over 500 pounds of technical manuals. I realized I can look things up on the...