@TerryBollinger yeah, though I think they weren't talking about exactly the same thing - i.e. the underlying math was a little different. Feynman's parton model still comes up on occasion, and it's describing something not quite the same as the modern QFT view of quarks and gluons.
@DavidZ here's a truly off-the-wall question: Have you ever encountered a color-charge model in which up quarks have two color charges, and down quarks one anti-color charge? It would be very, very early. It all balances out of course, but that doesn't mean it fits actual data.
My field is kind of right on the boundary between classical and quantum field theories, so I see bits of both of them depending on which papers I'm reading
@DavidZ there was some alternative color-distribution theories I've seen mentioned in papers by e.g. Glashow from the 1970s, but they are hard to find now.
@ACuriousMind heh, i can't even answer than, it was just a response Glashow gave to a question I think? But the "color charge per 1/3 electric, with the same sign" gives the right answers at the particle level, for whatever that's worth. I imagine there are many such equivalences.
@vzn Feynman and Gell-Mann were officemates with a very prickly relationship. Both were sniffing at the quark concept, and Feynman preferred his own term, but quark ended up dominating.
@ACuriousMind Preliminary calculation: I agree that the 'speed' of the change has to be ~c. If I understood the problem and the formulation of time dependent PT correctly, then our $V(t)$ is $f(t)H_{int}$
Then no matter what $H_{int}$ is (as long it is bound), it cannot show up in the integration (thus kill off all higher order terms) when $t\geq t_{switch}$, thus the coefficients of the wavefunction to the mth order will be $c_n$ for $t\leq t_{switch}$ and $c_n^{(0)}$ for $t\geq t_{swtich}$
@vzn this paragraph from that Wikipedia article summarizes it nicely:
"...Physicists were reluctant to firmly identify these objects with quarks at the time, instead calling them "partons"—a term coined by Richard Feynman. The objects that were observed at SLAC would later be identified as up and down quarks as the other flavors were discovered. Nevertheless, "parton" remains in use as a collective term for the constituents of hadrons (quarks, antiquarks, and gluons)."
@ACuriousMind I don't like using emojis in texts because they don't accurately reflect my emotions, but I'm not the hacker named 4chan so I don't use emoticons
@ACuriousMind In order to satisfy your curiosity, note that Mr. Morton refers to himself as "mine host" throughout his epic The New English Canaan.
@ACuriousMind Also "void swelling" is a phenomenon caused by elements getting knocked out of a crystal lattice. The interstitial atoms tend to "clump," causing the effect.
> J. SU, C. ZHANG, Z. J. WANG, J. T. ZHANG, H. SUN, C. C. JU, K. L. MIN, X. M. LU,∗ F. Z. HUANG, X. N. YING, AND J. S. ZHU∗
> Des Moines, Iowa (CNN)Hillary Clinton says she's a "proven fighter." Bernie Sanders says that while experience is important, "it is not the only thing" that Democratic voters should weigh. And Martin O'Malley took off his jacket.
> "He really does lie. He's so nervous," Trump added. "I saw him the other day. He is so nervous. He is such a mess. His polls have gone down. People realize that he probably can't even run for president. He was born in Canada."
Canadia BTFO
> The ad also shows Trump at a rally appearing to call Iowans "stupid." Trump responded on "Good Morning America" that he was simply referring to Iowans -- and Americans as a whole - who were supporting candidates other than himself.
Iowa BTFO :D
"Sit this one out, boy"
GG CNN. Post two polls side by side with completely different conclusions.
@yuggib Analysis: divergence of sequences, boundedness of convergent sequences, algebraic limit theorem. PDE: Heat equation on an interval with Neumann boundary conditions, heat equation on a loop, heat equation with Robin boundary conditions.
I wonder how many times the prof can write $X''+\lambda X=0$ before he goes insane.
it's hard to watch all of these movies when the average analysis problem takes me 2 weeks
@ACuriousMind Suppose I have some mass hanging on a cable which is fixed at the two ends. Am I stupid or is it not possible to find the tension in the cable?
I can find the component perpendicular to the ground, but not the other one.
One way to give this information would be to give the angle at the point where the mass is hanging. It is intuitvely obvious that the tension is higher the "straighter" the cable is.
@FenderLesPaul We don't have a dedicated school for that. We have elementary from grades 1-4 and "continuing school" from grades 5-10 (or 5-12 or 5-13)
