Reputation
3,462
Next privilege 5,000 Rep.
Approve tag wiki edits
Badges
10 49
Impact
~70k people reached

Jan
4
awarded  Popular Question
Dec
4
awarded  Popular Question
Nov
28
awarded  Popular Question
Nov
4
revised How to Calculate Anomalous Dimensions in (Effective) QED
Improved title, grammar, formatting
Oct
23
revised How to find frequency with only amplitude?
Improved question so it seems to fit better with the site policies.
Oct
23
comment How to find frequency with only amplitude?
I think that this question shouldn't be closed because it highlights a genuine physical misunderstanding, and as such is interesting. Also tpg2114 has given a good answer which explains the concept well, without providing a solution.
Oct
23
reviewed Close Anti-commutation relation for the dirac field
Oct
23
reviewed Leave Open CFTs in the phase space of QFTs
Oct
23
comment CFTs in the phase space of QFTs
You should clarify your question. If you are asking for examples of CFTs which are valid at any value of the coupling(s) then user2309840 has given a good answer above.
Oct
23
reviewed Close If this were possible, would it count as a modification of quantum mechanics?
Oct
23
reviewed Leave Open How to find frequency with only amplitude?
Oct
22
comment Explicit derivation of the Feynman amplitude of $e^+e^-\rightarrow\mu^+\mu^-$
Are you sure your $|\mathbf{p}|$ in your definitions of $u$ and $v$ is correct? In general this is not right - see for example equation (4.115) here. Of course, the question might just want you to look at a special case. If you look at the general scenario and compute the unpolarized cross section, I would expect some angular dependence since you'd get terms looking like $p\cdot q$. See for instance this analogous QED example.
Oct
22
comment Explicit derivation of the Feynman amplitude of $e^+e^-\rightarrow\mu^+\mu^-$
Yes - exactly: the amplitude should not be zero.
Oct
22
reviewed Reopen Position of centre of mass during toppling
Oct
22
answered Explicit derivation of the Feynman amplitude of $e^+e^-\rightarrow\mu^+\mu^-$
Oct
22
reviewed Leave Open Explicit derivation of the Feynman amplitude of $e^+e^-\rightarrow\mu^+\mu^-$
Oct
22
reviewed Approve How far will the bullet travel before falling back to earth?
Oct
15
comment Scattering Amplitudes from Feynman Diagrams (Spinor Helicity Formalism)
I've updated my answer to include more detail. Let me know if that makes sense now!
Oct
15
revised Scattering Amplitudes from Feynman Diagrams (Spinor Helicity Formalism)
more detail
Oct
14
answered Scattering Amplitudes from Feynman Diagrams (Spinor Helicity Formalism)