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12:00 AM
I arguably have one physics groupie. And the most important words to remember in that relationship are "Yes, dear." She keeps me within a virtual displacement of the straight and narrow.
 
 
7 hours later…
6:39 AM
1
Q: Is uniform circular motion an SHM?

Lucyfer ZeddI know the projection along a diameter is an SHM but is circular motion itself an SHM? If we consider the mean position to be the center of the circle then the centripetal acceleration is proportional to the distance and in opposite direction of the position of the particle. So shouldn't it be an...

I would like to discuss elements of this.
Wikipedia defines SHM where force is proportional to displacement
But, if we allow displacement to be given by a vector, the individual force components are indeed proportional to the individual displacement components.
Would that actually justify circular motion to be an SHM?
 
@Cheeku that just makes the proportionality constant a cross product
$\vec F = \vec K \times \vec r$
Also, Wikipedia definitions do not make up physics :p
5
 
@ManishEarth Exactly! So, philosophically, it is an SHM?
What do you say?
Additionally, an answer has been given against my argument. I dunno. Even in QM, you do use spherical harmonic solutions to model vibrating strings in plane
That makes it the other way round. SHM is a type of circular motion. :/ I am doubtful now
 
7:09 AM
@Cheeku It's sinusoidal
 
 
6 hours later…
12:39 PM
@ACuriousMind: Is there a chapter/section of a text you can recommend that goes through the whole representation theory of Lie groups, etc. using the roots and weights method? I've watched the Perimeter lectures on it, but it's very hand wavy.
That's aimed more for physicists
 
12:56 PM
@JamalS I have never completely worked through it, but I find these lecture notes to be quite comprehensive, chapter 35 covers what you are asking about, and there's no hand waving at all.
 
@ACuriousMind: Thanks, I'll have a look.
 
1:18 PM
0
Q: How can we lock the frequency of a vertical cavity surface emitting laser (VCSEL)?

NidhiSHow can we lock the frequency of a vertical cavity surface emitting laser (VCSEL) to the Rubidium-87 D1 transition without using a dichroic atomic vapor laser lock (DAVLL) setup?

 
2:08 PM
Whoa...I'm finally ahead of Brandon in a review queue: meta.physics.stackexchange.com/review/close/stats
@ACuriousMind In the first page, does $M(n,\mathbb R)$ mean an $n$-dimensional manifold in real space?
 
@KyleKanos No, it means the $n$-dimensional square matrices with real entries
 
Damn
My math skills suck
And now I see that it says, where $M(n,\mathbb R)$ consists of $n\times n$ real matrices.
So my reading skills suck too
 
@KyleKanos Impressive work ;)
@KyleKanos Nothing to do with your math skills - there are more notations for matrices than cats have lives. I've seen things like $\mathrm{Mat}_\mathbb{R}(n,m)$ as well as simply $\mathbb{R}^{n \times m}$ or $\mathrm{Lin}(\mathbb{R}^n,\mathbb{R}^m)$.
 
I much prefer $A=\left(\begin{array}{cc}A_{11} & A_{12}\\A_{21}&A_{22} \end{array}\right)$
Abstracts can be funny: arxiv.org/abs/1411.3297
 
2:26 PM
Ouch
 
Bidin is a bit less stern in the judgement of someone else's work: arxiv.org/abs/1411.2625
(And related to one of my 2 questions)
I should probably start asking more, but I think I'm at the point in research where I'm only questioning my own work and no one else here does that so it seems sorta moot
Also, my day has just started and i have five close votes left
 
 
3 hours later…
5:15 PM
Little boy had a yield of 16 kT of TNT. The largest artificial non-nuclear detonation on record had a yield of 7 kT. You don't have to worry, that compressor station, if it blows, won't be anywhere near the size of an atomic bomb — Jim 21 mins ago
@Jim: Unless, of course, it is a nuclear bomb that blows up the compressor ;)
 
5:50 PM
Another question about the edit rejection reasons: Am I blind, or is there no standard response corresponding to "This edit is factually incorrect"?
 
Well, you could chalk it up in the "no improvement whatsoever" category
 
Hm, I guess it falls under "fails to make the post more accurate" in the text to that reason
 
@ACuriousMind: If you are rejecting an edit because it contributes information that is incorrect, you can choose the option that it harms the post, and write a comment explaining why it's factually incorrect.
 
@JamalS Yes, I did that. I was just surprised that "this is wrong" is not a standard response
Then again, it might not actually happen often enough to warrant its own canned response
 
@ACuriousMind: Regardless, the edit responses need improvement
The standard ones are badly worded
 
6:04 PM
@JamalS Except for my dislike of the no improvement whatsoever, I don't find the rest particularly lacking
 
I'll have a look again the next time an edit pops up
 
@JamalS Or, you could read them here ;)
 
@ACuriousMind: By the way, that reference earlier on Lie algebra, roots, etc. is pretty good.
@ACuriousMind: Thanks :)
 
You're welcome :)
 
 
2 hours later…
7:56 PM
0
Q: (Why) does this particular question keep getting bumped up by Community?

Emilio PisantyI've noticed several (>~3) times over the past few months that the question About the proposal to ban homework has been bumped up the front page of Meta, on separate occasions. I don't think it happens that often at all, and I'm not sure whether it's a good thing on Meta. Is there some way to se...

 
 
3 hours later…
11:03 PM
...what is the point of showing me questions in the LQ queue when I'm out of close votes? I cannot vote to close them, so I must skip the review if I do not think they "look OK" or that I could edit them.
 

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