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"I would never die for my beliefs because I might be wrong."

-- Bertrand Russell


Oct
15
revised Schrödinger equation with complex potential
deleted 7 characters in body
Oct
14
comment The equation of a ferrofluid under a magnetic field?
You won't need the full Navier-Stokes equations since the problem is static. Neither will you need the full Maxwell equations. That should simplify the problem a lot. You'll also need equations describing the interaction between the ferrofluid and the field.
Sep
24
comment Can we have discontinuous wavefunctions in the Infinite Square well?
It probably makes sense if you extend the meaning of the Schrödinger equation in terms of distributions.
Sep
15
awarded  Pundit
Sep
13
comment Calculation of Distance from measured Acceleration vs Time
If you are only interested in vertical displacement, you only need vertical acceleration as well. Can you show us what you did?
Sep
4
comment 3 inertial frames compared in STR
No, $(x_1, t_1)=(x_2, t_2)=(x,t)$.
Sep
1
comment Would it be possible to develop special relativity without knowing about light?
It's easy to imagine. A blind man can use a radio to communicate. But radios transmit signals using the electromagnetic spectrum. So even an observer who can only detect things via sound would eventually discover that the true "speed limit" is the speed of light.
Sep
1
comment Would it be possible to develop special relativity without knowing about light?
We are insensitive to most of electromagnetic raditation. In fact, it took us quite some time to realize that visible light is just a manifestation of electromagnetism. Most of the electromagnetic spectrum is detected by specific instrumentation. If that species can develop a science, I don't see any reason why it could not develop those tools. It would only take the realization that some energy is going somewhere they don't "see".
Aug
31
awarded  Nice Answer
Aug
25
comment Is it the act of measuring a quantum particle that causes it to lose its uncertainty?
How will you check that you correctly inferred the location of the particle?
Aug
21
comment Shor's algorithm and Bohmian Mechanics
I didn't realize 't Hooft made a thread here. Is he the real deal? ;P Great, I'm off to read that one!
Aug
16
comment Is dark matter really present around the sun?
Fair enough, I think every statement about dark matter should really be preceded by "we think that..." or "it is hypothesized that...".
Aug
16
comment Is dark matter really present around the sun?
I guess transparent matter would work, it just doesn't sound that ominous. ;)
Aug
16
answered Is dark matter really present around the sun?
Aug
9
comment what is wrong with the following argument about stokes law in compact universes?
I was just going to say that. It's easier to visualize with a closed curve on the surface of a sphere, thus dividing it in two regions. You have to determine an orientation along which to integrate over the curve and if you mean to enclose the other region, then the orientation w.r.t. to your previous choice must reverse.
Aug
7
comment Why is the probability that Kip could go back and kill his grandfather $10^{-10^{60}}$?
I don't know the detailed calculation. I suspect it can be found in "Gravitation" by Wheeler, Thorne and Misner. It must be based on the instability of wormholes. Wormholes have a very short lifetime and thus a probability must be associated with that lifetime.
Aug
7
revised Why is the probability that Kip could go back and kill his grandfather $10^{-10^{60}}$?
added 1 characters in body
Aug
7
comment On Bell's Inequality (Classical Intuition) and Quantum Mechanical Counter Intuition
It doesn't take care of it, since the local hidden variable theory leads to Bell inequalities which are incompatible with QM. Still don't see your point.
Aug
7
comment Why is the probability that Kip could go back and kill his grandfather $10^{-10^{60}}$?
Yes, but I think the point is that Hawking is envisioning time travel through a wormhole. That's the theory he's relying on. Thus, I suspect the probability is related to the probability of creating a stable wormhole capable of sending Kip Thorne back in time. Which would be a very low probability indeed.
Aug
7
comment Why is the probability that Kip could go back and kill his grandfather $10^{-10^{60}}$?
It must be based on some particular theory for the process that would take Kip back in time. I don't have my copy of "The Universe in a Nutshell" at hand, can you maybe quote the full paragraph in which the statement is made?