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Mar
22
awarded  Popular Question
Feb
10
awarded  Nice Question
Feb
6
awarded  Notable Question
Jan
29
comment Proving that Planck's Law is dimensionally homogeneous
Why is it called dimensionally "homogeneous" if the opposite would just be "wrong"?
Jan
26
answered What does $L^2(S^1,\mu_H)$ mean?
Jan
9
comment Startups for astrophysics
You can surely also find information if you search "introduction to..." here in the search bar.
Jan
8
awarded  Popular Question
Jan
5
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Dec
14
revised How does time look relatively in a gravity well?
deleted 9 characters in body
Dec
14
revised How does time look relatively in a gravity well?
added 232 characters in body
Dec
14
answered How does time look relatively in a gravity well?
Oct
6
comment How do Hubble Units work?
Found this Wikipedia reference.
Oct
1
comment Yang and Mills' (and others') justification for local gauge invariance
@ACuriousMind: Maybe that's the answer for him, then.
Oct
1
comment Yang and Mills' (and others') justification for local gauge invariance
I'm certain OP is aware of the first point and is just asking if a global-only field theories must be ruled out for describing physics if locality principles are assumed.
Sep
23
awarded  Yearling
Sep
16
awarded  Popular Question
Sep
13
comment Harmonic Oscillator propagator
I'd say the second equation with the derivative is not so evident, is it?
Sep
13
comment Harmonic Oscillator propagator
From one perspective, you just ask how $\frac{∂}{∂t}\langle x|e^{At}|y\rangle=\langle x|Ae^{At}|y\rangle=A\langle x|e^{At}|y\rangle$ should be made sense of. Is the case without the term $\frac{p^2}{2m}$ clear?
Sep
9
comment Intuition for spin 1/2 and 1 propagators
$\frac{1}{p^2-m^2}$ is $(\Box+m^2)^{-1}$ in Fourier space, in that it solves $(\Box+m^2)\,\phi=j$ for $\phi$. The spin 1/2 case $\frac{\gamma\,p+m}{N}$ solves $(\gamma\,\partial-m)\,\psi=j$, and so on.
Aug
25
awarded  Nice Question