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location The South
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visits member for 2 years, 9 months
seen Apr 13 at 21:01

Apr
5
comment Is the Higgs field part of space?
Fields aren't elements that make up space. Rather, they are conditions on space. Think of them as mathematical functions that assign a physical quantity to each point in space and time. For instance, the electric field assigns an electric field vector to each point of space. The Higgs field assigns four component complex scalar from SU(2) to each point of spacetime, instead of assigning a vector to each point. So we call it a Higgs field instead of a vector field.
Mar
30
comment What is Fermi energy and Fermi level?
Please, there's no need to shout.
Mar
30
comment Principal value of 1/x and few questions about complex analysis in Peskin's QFT textbook
Unfortunately, there are two completely unrelated meanings of the term "principal value". The kind referred to here is the Cauchy principal value, which assigns values to otherwise undefined improper integrals. This has nothing to do with the principal value you had in mind, which is for selecting single-valued branches of multi-valued functions. I know, it's stupid. You'd think someone would have fixed all these weird ambiguities by now, but alas math is not French.
Mar
30
comment Rutherfords alpha scattering conclutions?
Rutherford observed a lot of things over the years. Could you be a little more specific about the physics you're asking about?
Mar
29
comment Could elementary particles join to create bound states?
@jinawee Electrons do "feel" the weak force. Two electrons can interact via exchange of virtual Z bosons, though the amplitude of this interaction is negligible compared virtual photon process accept at high energies.
Mar
29
comment Could elementary particles join to create bound states?
The weak interaction does not produce bound states at all.
Mar
29
revised Electromagnetic force interaction
added latex; other small fixes
Mar
29
suggested approved edit on Electromagnetic force interaction
Mar
24
comment Electromagnetic force interaction
A hydrogen atom is one proton plus one electron, so its overall electric charge is zero. But even though hydrogen atoms are neutral, the electric force will bind two hydrogen atoms together to form molecular hydrogen, $H_2$.
Mar
24
comment How do you measure a particle's postion or momentum?
The crux of the problem is that in order to measure the position accurately, you need to bounce low wavelength light of the particle. But to measure momentum accurately, you need low frequency light instead.
Mar
21
comment What's the meaning of the age of the universe?
You have gravitational time dilation backwards. The closer a clock is to a source of gravitation, the more slowly time passes. So instead we might expect time to flow infinitely slowly for your impossible observer.
Mar
21
comment How do collisions of fundamental particles produce different fundamental particles?
@csabol Hehe, the thing about a surprise is that eventually it stops surprising you if it keeps happening. We do get used things. It's happened before, though we're prone to forget it. For example, look at what you said: "both my vibrating vocal chords and the vibrating air particles are massive objects, and thus I would not be surprised by their interaction". Air is substance? This substance has mass? That mass is comprised of particles? The particles vibrate? That's four surprises right there that you apparently take for granted today. ;)
Mar
21
comment Why don't we have more elements?
@BMS I don't think that's what he's doing. I think he's referring to the fact that the chemical elements are only composed of up quarks, down quarks, and electrons.
Mar
21
comment How do collisions of fundamental particles produce different fundamental particles?
Something else just occurred to me. That analogy basically is attempting to make the creation and annihilation seem less mysterious by pointing out that we're already used to waves exhibiting this behavior all the time. And QM says particles are also waves, right? So crisis averted. Historically though, wave-particle duality came about 30 years before matter creation and destruction. This must be one of the reasons why wave-particle duality gave people anxiety attacks in the beginning.
Mar
21
comment How would a black hole behave in a double slit experiment?
Great question! Physicists would be foaming at the mouth for chance to actually perform this experiment.
Mar
21
comment How do collisions of fundamental particles produce different fundamental particles?
@Andrew That's one of my favorite Feynman stories, mainly because his analogy went a long way towards helping me explain to my father at least. The sound of my voice when I speak wasn't somehow inside my voice box the entire time (it's not a literal box full of voice!), and it's not as if we have a stock of, say, 20 'ah's and once we use 'em up we have to go to the store and buy more. The vibrations of our vocal chords simply produce sounds on demand, and once a sound has completely dispersed it's gone for good, as opposed to having gone somewhere else.
Mar
21
comment Special relativity: moving charge and twisting bar magnet
Probably relevant background information: The moving magnet and conductor problem wiki.
Mar
16
comment Physical motivation for differentiation under the integral
@pppqqq While you certainly have a point, it's been my experience that physicists are occosaiinally better equipped to answer some math questions by virtue of a difference of emphases in their educational background, and I don't personally think there's anything wrong with asking those questions on this site. This may be one of those questions.
Mar
15
comment Can we have a static point in the universe?
I repeat, there is no center of the Universe.
Mar
14
awarded  Pundit