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seen Feb 15 at 12:25

Jul
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awarded  Curious
Nov
17
awarded  Favorite Question
Sep
9
awarded  Yearling
Jun
25
suggested suggested edit on Determine whether the ground state is an eigenfunction of [p] and of [p^2]
Jun
25
answered Determine whether the ground state is an eigenfunction of [p] and of [p^2]
Jun
24
comment What is the process that gives mass to free relativitic particles?
And with it you lose the opportunity to push the understanding of mass beyond the Newtonian level, while unnecessarily adding all the excess incorrect physics as outlined by Michael Brown.
Jun
24
comment What is the process that gives mass to free relativitic particles?
"Drag is wrong". Precisely! Hence why it's a bad way to describe the mechanism. It obscures its real nature. Certainly it's an interaction term, but the gap between QFT interaction and our classical intuition about objects moving through fluids is such a long one that I don't think it's a particularly enlightening analogy.
Jun
24
revised What is the process that gives mass to free relativitic particles?
Added "non-zero"
Jun
24
comment What is the process that gives mass to free relativitic particles?
I'll add an edit to make explicit the non-zero part, which may not be clear.
Jun
24
comment What is the process that gives mass to free relativitic particles?
How on earth does the viscous analogy capture any of that? It suggests drag, which is plainly wrong. The "Higgs potential energy" I referred to is exactly the interaction term you mention, just put in more layman's terms.
Jun
24
answered What is the process that gives mass to free relativitic particles?
May
18
awarded  Notable Question
Apr
3
comment Show that for QM operator A: $\int_{-\infty}^{\infty}\psi A^{\dagger}A\psi dx = \int_{-\infty}^{\infty}(A\psi)^*(A\psi)dx $
Sorry, made a complete hash of that (the lessons of not posting answers just before you go to bed).
Apr
2
answered Show that for QM operator A: $\int_{-\infty}^{\infty}\psi A^{\dagger}A\psi dx = \int_{-\infty}^{\infty}(A\psi)^*(A\psi)dx $
Jan
9
comment Do some half-lives change over time?
Thanks, OP here (sorry, couldn't remember password, had to sign in under a different name). I did consider what you mention, but it doesn't seem to fit particularly well with having two distinct categories of radionuclide. I suspect the answer is one or both of a) the student's misremembering what the teacher said and/or b) the teacher talking nonsense. Wouldn't be the first time...
Jan
7
asked Do some half-lives change over time?
Oct
27
comment Why do physicists believe that particles are pointlike?
If we stick in non-polynomial terms in the lagrangian (eg. $\sin[\phi]$, $\phi^{3/2}$ terms), are we smearing out the interactions?
Sep
14
comment How to prove that proper orthochronous Lorentz transformations form a group?
Excellent answer. One point: the $a_{1,2}\neq 0$ condition in eqns 12 and 13 is redundant, given eqn 6 (though I'm guessing you know that).
Sep
11
answered Is a compact universe consistent with the results of (for example) the Michelson-Morley experiment?
Sep
11
comment Is a compact universe consistent with the results of (for example) the Michelson-Morley experiment?
Compact is not the same as curved and topological compactness is not incompatible with flatness. Compactness is a global property, so what is "locally non-compact" supposed to mean? (Edit: sorry, posted without refreshing and spotting the previous comments, of which this essentially a repeat)