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Apr
11
awarded  Nice Answer
Jan
16
awarded  Yearling
Jan
5
comment Radial quantum number for infinite circular well
In a sense you want eigenfunctions of raising and lowering operators.
Dec
20
awarded  Popular Question
Nov
30
accepted What is a bulk phase transition?
Nov
30
comment What is a bulk phase transition?
Thanks, I only know the term "domain wall," so I needed that extra explanation.
Nov
29
comment What is a bulk phase transition?
"for the 2d surface", what 2d surface? How are you using the word "interface" in this context?
Nov
28
comment What is a bulk phase transition?
"Impose boundary conditions that create a d−1 dimensional interface between the two phases." You mean if I'm in three-dimensions, construct a two-dimensional sheet of critical points? I don't understand how the b.c. relate to constructing a a $d-1$ dimensional critical surface.
Nov
26
answered I do not understand why $a_-a_+\psi_n=(n+1)\psi_n$
Nov
18
awarded  Good Answer
Oct
14
awarded  Nice Answer
Jun
27
comment A trace formula of two noncommutative operators
Why doesn't $U_{I}$ need $\exp(-i/\hbar H_{0}\Delta t)$ on the right side?
May
19
comment Geometric interpretation of quantum Yang-Mills field
@ACuriousMind There is nothing in any theory! all we do is interpret, it's called "physics." Why don't you think there is any geometric relationship to particles? So far every part of physics has been geometry, even the algebra parts...
May
18
comment Why don't we take this term $D_{\mu}D_{\nu}F^{\mu\nu}$ in Lagrangians?
@Olof Oh duh, you are right! I was only thinking of the partial derivative part in my mind... My bad. It's the definition of the curvature lol. I agree.
May
17
revised Why don't we take this term $D_{\mu}D_{\nu}F^{\mu\nu}$ in Lagrangians?
added 534 characters in body
May
17
answered Why don't we take this term $D_{\mu}D_{\nu}F^{\mu\nu}$ in Lagrangians?
May
17
revised Phonon modes in one-dimensional monoatomic chain
very well, I will finish the last couple steps.
May
16
comment Why do non-accelerating objects exert force on each other?
I say this answer is a better description of what is going on. Really the OP is interested in the relation $\vec{F} = d\vec{P}/dt$. Here the force is related to the change in momentum, or for fixed mass, change in velocity in time.
May
16
answered Phonon modes in one-dimensional monoatomic chain
May
15
comment Why does the field of an electric dipole drop off as $1/r^3$?
Thank you for the first sentence of this answer. I assume this is what the OP wanted. "Have you tried deriving it yourself blah blah..." is useless since you can't set up the first line you wrote without the physics, which is the near cancellation. I'm glad you wrote that.