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seen Mar 21 at 23:51

Mar
20
revised Doesn't the Schwarzschild metric combined with Hawking radiation imply that nothing ever gets past the event horizon of a black hole?
added 21 characters in body
Mar
20
asked Doesn't the Schwarzschild metric combined with Hawking radiation imply that nothing ever gets past the event horizon of a black hole?
Mar
18
awarded  Popular Question
Aug
15
comment Is it possible to levitate a toy maglev train using only permanent magnets as long as the train stays in motion?
@DustinLovell You would just have to build it very precisely, which is pretty hard with permanent magnets to be honest. In fact, now that I think about it, a u shaped or w shaped track is almost the same thing as having guard rails, you've just effectively made them one with the track. Unfortunately, you're never going to get a "quantum locking" effect without a superconductor.
Aug
14
answered Is it possible to levitate a toy maglev train using only permanent magnets as long as the train stays in motion?
Aug
13
awarded  Yearling
Aug
8
comment How to block neutrons
I know neutrons obey Snell's Law, with the index of refractions being dependent on temperature, but I can't remember the derivation... but you can, in theory, make a "neutron bottle" for sufficiently cool neutrons, with experimentally found neutron index of refractions, just using Snell's law and basic quantum mechanics.
Aug
8
awarded  Commentator
Aug
8
comment What would earth look like if traveling at 77% the speed of light?
Both! en.wikipedia.org/wiki/…
Jul
19
comment What is the probability density function over time for a 1-D random walk on a line with boundaries?
what type of steps are you taking? Also, what do you mean be "impassible"? Do you mean you reject any step that takes you over the boundary?
Mar
4
revised Derivatives of operators
added 707 characters in body
Mar
4
comment Derivatives of operators
Doesn't $\hat{X}$ depend on $x$? So when you take the derivative with respect to $x$, it should mean something?
Mar
4
comment Derivatives of operators
@ChrisWhite I edited the question. What I would be looking for is something like $<\frac{d\hat{X}}{dx}>$, more info in the question.
Mar
4
revised Derivatives of operators
added 510 characters in body; edited tags
Mar
4
asked Derivatives of operators
Feb
24
accepted Spin about an arbitrary axis
Feb
24
revised Spin about an arbitrary axis
deleted 14 characters in body
Feb
24
comment Spin about an arbitrary axis
Thank you for this answer, is the $\theta$ in $X'=e^{-i\frac{\theta}{2}n_i\sigma_i}X$ in "physical" space or "spinor" space?
Feb
22
asked Spin about an arbitrary axis
Feb
1
accepted How should I simulate the electric potential field from a wavefunction?