42,917 reputation
1980172
bio website ellipsix.net
location Wuhan, China
age 29
visits member for 4 years, 4 months
seen 6 hours ago

I'm a postdoc doing research in high-energy particle physics. I also have a hobby interest in computer programming.

You can find me on Twitter, or check out my blog and personal website! Or you can email me at stack@ellipsix.net.

Please don't contact me through any other channel about something that should be handled through this site. If you do, I'll probably just tell you to post it here.

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8h
comment Using the optical theorem to calculate the imaginary part of a loop diagram
I didn't imply that - at least I didn't mean to, but sorry if I did. I was just explaining how the ideal question-asking process works, in general, not describing what I thought you did in this specific case.
8h
comment Using the optical theorem to calculate the imaginary part of a loop diagram
That one question is probably too broad. There are chapters of textbooks written about it. (That's also a criterion for a question not to be acceptable here, i.e. if it's too broad.) If you've done prior research, that's great, but if the research leads you to an approach, you should try that approach, and if you run into trouble, then you post a question about the thing you ran into trouble on. Don't just ask if what you found is going to work. So in this case, your question about $\mathrm{d}\Pi$ are a pretty good one for this site on its own.
9h
comment Using the optical theorem to calculate the imaginary part of a loop diagram
Hi calavicci - on this site each post should have one question, or at least a few closely related questions, so I've removed the other questions from your post. You can post them separately if you like (although questions that just as "is this right?" tend not to be well received here).
10h
comment Are the particle-wave duality and the quantum uncertainty principle united?
@Danu a question shouldn't be closed as a duplicate of another question just because the other question's answer happens to address the first question.
11h
comment Does a nonzero Poynting vector mean that there is propagation of energy?
@JánLalinský I'll see if I can improve the wording. But by way of a counterpoint, consider the energy density depicted in this image. What would be the direction of propagation?
19h
comment Engravings in “Wandering the Immeasurable” sculpture outside the CERN globe?
@tpg2114 no argument that it's looking for a very specific reference that only physicists would know about, but is it about physics? I don't think so, and therefore I consider it off topic.
1d
comment Help a layperson out here
Hi Brian, and welcome to Physics Stack Exchange! I'm closing this as unclear because the thing that is not clear is what about this question is physics. As @ACuriousMind pointed out, QM has nothing to say about simulations. (I would also mention that, while there is no required level of physics knowledge to participate, this site is not targeted at laypeople.)
1d
comment How can I add a sound wave on top of an existing one, without harming the original's loudness?
I think this is off topic here, but if so we could migrate it to Signal Processing.
2d
comment What is the center of Earth's landmass?
if that's meant to be an argument that the question is about physics, it's a remarkably weak one; in any case, this is probably a geology question.
2d
comment Why must the deviations from equilibrium be small for zero difference in energy in this solenoid?
@marmistrz ah, good to know. If you wind up editing the question again, that might be good information to add in (though it may or may not be worth an edit on its own)
2d
comment Why must the deviations from equilibrium be small for zero difference in energy in this solenoid?
What energy difference are you asking about? Between which two states?
2d
comment How can i convert an audio into a waveframe?
Hi Carlotta, and welcome to Physics Stack Exchange! I agree that it's not really clear what you're asking, but furthermore I suspect that your question isn't really a physics question. I'd suggest you take some time to do some preliminary research and focus your question, and then you can see whether it would fit at a site like Video Production or Signal Processing.
Mar
25
comment Why is mass per second constant in the Equation of continuity?
Krishna could you please edit all the necessary clarifying details into your question?
Mar
25
comment Could Fire Tornados Exist?
I'm voting to close this question as off-topic because it's not about physics.
Mar
25
comment Why doesn't the light get out?
@JohnRennie well if it's really a duplicate then there's no reason for answers to be posted here, so it should be closed (though I like to say "marked as duplicate", because it's not bad in the way some closed questions are). In any case I somewhat agree - it seems at least pretty close to being a duplicate.
Mar
25
comment Sign convention for the Minkowski metric $\eta_{\mu\nu}$
The (or, at least, one) reason for $(+---)$ is so that $p^\mu p_\mu = m^2$ instead of $-m^2$. Which is just as good of a reason as the argument about distance - why should particles have imaginary mass just because you begin to consider special relativity? ;-) Fix that and you get my upvote.
Mar
23
comment Can the N-body problem be solved numerically using the geodesic equation of mass-distorted spacetime?
This is a perfectly fine question, but bear in mind that you're talking about solving the 1-body problem in a more or less arbitrary background, not the N-body problem.
Mar
23
comment Collapse and revival in the Jaynes Cummings model
Well you're certainly not the only one who thinks that way, and I'd encourage you to check out some of the relevant feature requests on Meta Stack Exchange (e.g. asking for the ability to make minor edits which don't bump the post). But for now, just make sure to fix everything you can find that needs fixing when you edit a post.
Mar
22
comment Weizsäcker–Williams approximation
You know, I'm not sure I see why this was downvoted...
Mar
22
comment Why do we lift our feet when we walk?
I've checked and it seems likely this would be off topic on Biology.