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Apr
9
comment The derivation of fractional equations
Exactly this is indeed done here.
Apr
4
comment The unreasonable effectiveness of the partition function
I ask this question here.
Mar
31
comment What algebraic structure does the collection of all physical quantities form?
@Jimmy360: If you type "C* algebra" in the search bar, you get 2675 results. Or try "Lie group", "Lie algbera", etc.
Mar
30
awarded  Popular Question
Mar
28
comment What is the function type of the generalized momentum?
Thanks for the answer - is there a reasonable name for the pullback of the momentum function?
Mar
28
comment What is the function type of the generalized momentum?
@yuggib: My point was that the Poisson bracket is defined as derivatives w.r.t. q and p, and on the rigth side we take such derivatives of q and p. On the left, on the other hand, we need to speak of trajectories. That's why they are odd, without pointing out where we substitute what.
Mar
28
comment What is the function type of the generalized momentum?
@yuggib: It seems to me that equations stated like ${\dot q}=\{q,H\}$ and ${\dot p}=\{p,H\}$ are completely odd, no matter which of the two perspectives you take.
Mar
28
asked What is the function type of the generalized momentum?
Mar
26
awarded  Good Question
Mar
23
comment Which physics quantities are real and which just a tool in the Newtonian apporach?
@ShingLau: The problem with "physical meaning means: mathematics with physics reality/something real" is that for every physical quantity in your theory of choice, you will find a theory of fundamental physics where is arises as some composite object, and then it will be easy to argue that it's just a tool. Quantum mechanics defines a force like F=ma as some average, and only late into the theory. Some recent theories will have space and time itself emerges form other quantities. What do you really mean with a question like "what does XXX tell us about reality?" and "physical sense"?
Mar
19
awarded  Nice Answer
Mar
18
revised Derivation of Schrödinger equation - free particle
Österreich! Österreich! Österreich! Österreich!
Mar
18
suggested approved edit on Derivation of Schrödinger equation - free particle
Mar
16
comment Why is light called an 'electromagnetic wave' if it's neither electric nor magnetic?
Coming back to this answer which I gave 3 years ago, I feel it's a bit cryptic. The gist of my thinking is that I don't think peoples questions, if formulated in a misguided (inherently confusing) conception of physics, math and language, should maybe not be answered in their own terms. This just reinforces their ideas and turns them into people who themselves give non-explanatory explanations (answers that just move the question around).
Mar
12
comment Kerr metric Christoffel symbols
@ChrisWhite: But it's easier than doing the same thing by hand.
Mar
12
comment Kerr metric Christoffel symbols
Nice. In a similar spirit (on the Robertson-Walker kind of metrics in different coordinates), I found this and this reference very helpful.
Mar
12
revised Kerr metric Christoffel symbols
deleted 4 characters in body
Mar
12
revised Kerr metric Christoffel symbols
added 77 characters in body
Mar
12
answered Kerr metric Christoffel symbols
Mar
11
comment Why isn't the path integral rigorous?
It's 'excellent and pedagogical' compared to what other presentation?