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

-- Bertrand Russell


Dec
3
comment How can I stand on the ground? EM or/and Pauli?
Woops, sorry, forgot about it.
Dec
3
comment Magnetism-Related Terminology
Sorry, couldn't resist.
Dec
3
comment Is it possible to throw an object faster but over the same distance?
Or in baseball. Even in soccer.
Dec
3
comment Which experiments prove atomic theory?
On the contrary, Boltzmann was an advocate of the atomic hypothesis. He actually implemented it in his mathematical research of the mechanical foundation of thermodynamics. He even introduced quantization of energy before Planck as a tool of computation.
Dec
3
comment Deriving the speed of the propagation of a change in the Electromagnetic Field from Maxwell's Equations
Basically, the form of the equation. As Marek puts it in his answer, it's the d'Alembert wave operator. It's a thoroughly studied operator and the spectrum is well-known. In other words, the behaviour of the solutions is known to be waves moving at velocity the square root of the coefficient in front of the Laplacian (if the coefficient in front of the double time derivative is 1).
Dec
2
comment Which experiments prove atomic theory?
Actually, there is an experiment by Perrin related to this which has been pivotal in the acceptance of the atomic hypothesis. I think Perrin got the Nobel Prize for it by the way.
Dec
2
comment Ising model for dummies
Maybe something for Marek, since he's trying to understand the 'Onsager solution' better.
Dec
2
comment CPT and heat equation
@dmckee: Of course, I didn't mean to give an exhaustive explanation. In fact, I left my explanation open to many attacks on purpose. I hope that Boy will think further and come to these questions by himself. But a thorough answer would indeed need a thorough course in statistical mechanics.
Dec
2
answered Nonlinear optics as gauge theory
Dec
2
comment CPT and heat equation
Actually, the Schrödinger equation is invariant. But you have to take the complex conjugate of $\psi$. Since $\psi^*$ and $\psi$ have the same probability distributions $|\psi|^2$, the physics remains the same.
Dec
2
answered CPT and heat equation
Dec
1
comment How many Onsager's solutions are there?
Yeah, I kinda got that was what you were looking after, the technique to arrive at the solution rather than just the solution itself. Maybe you should put a bounty on the question to attract people. :p
Dec
1
comment How many Onsager's solutions are there?
Seems to me the differences are just in the techniques. The solution of the system should remain the same, and that's why they call it Onsager's solution, while there are many different ways to arrive at it. Quite typical of physics problems no? Wether you solve the Kepler problem with Newtonian mechanics or Hamiltonian mechanics, the solution is the same. However, a new insight can be coupled to the different technique. Or one of the techniques can be more easily generalizable. If nobody comes along with a ready answer, I'm willing to look a bit more deeply into this.
Dec
1
revised Ising model for dummies
added 28 characters in body; deleted 62 characters in body
Dec
1
revised Ising model for dummies
added 297 characters in body
Dec
1
comment Ising model for dummies
I found some books I used back in the day when I had to do an undergrad project about the subject. I can't remember what book was most useful, but I'll just add the ones I think are relevant. Note, they are pretty old, so there might be some recent books with nicer approaches.
Dec
1
answered Ising model for dummies
Dec
1
comment Light emission spectrum units
It doesn't specify in what units the numbers in the other files are. But I suppose knowing the apparatus that did the measurement can help resolve that issue.
Dec
1
comment What's with the very slightly larger mass of the neutron compared to the proton?
Sadly, they can not yet differentiate between proton and neutron. But it's a great achievement nonetheless.
Dec
1
comment What is an analog to QM's Hilbert space in GR?
You are really obsessed with this perfect fluid history, aren't you? I'm sorry but I can't tell you, that's outside of my expertise. It seems to me you should talk to some astrophysicist doing simulations of things like galaxies. That's typically the kind of field where people worry about such questions. Try to ask a question which has this explicitly in the topic title, maybe you'll get an expert to reply. +1 for Marek, exactly my thought. ;)