44,106 reputation
2080174
bio website ellipsix.net
location Wuhan, China
age 29
visits member for 4 years, 6 months
seen 9 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.

Any responses to moderator messages, or comments on official moderation actions here, will be ignored if sent through external channels!


1d
comment Why is this not considered a perpetual motion machine?
@JimtheEnchanter that should be an answer.
1d
comment Why is this not considered a perpetual motion machine?
A better example might be a satellite orbiting the Earth, with a precisely calibrated cannon.
1d
comment Is it possible for someone traveling at the speed of light to see at all?
@Kevin.hammet yep, you bet we would put Einstein's question proposing relativity on hold in a heartbeat. This is not the place to be presenting brand-new physics. Anyway, this is a slightly different issue. You're not presenting a new theory, you're asking us to use a known theory to analyze a situation which is forbidden by that theory. That's different but also off topic.
May
19
comment Is it possible for someone traveling at the speed of light to see at all?
See the help center, specifically with respect to fictional physics. Since the question is based on an object moving at the speed of light, it cannot be within the framework of general relativity. If the question asked about such a situation within some (mainstream) alternate theory which does allow objects to travel at the speed of light, then it'd be fine, but as is, this question is just one of those "assuming physics doesn't work, what does physics say would happen" type questions, which are off topic.
May
19
comment What physics paper would a high school student be able to read?
I actually don't think this is on topic. It's not a content-based resource recommendation, which is the type of resource recommendation we allow.
May
18
comment What Is The Difference Between The Maths That Physicists Use And The Maths On A Typical Mathematics Degree
I'm voting to close this question as off-topic because it is about educational/career advice.
May
18
comment Difference between maths in physics degree and maths in a maths degree
I'm voting to close this question as off-topic because it is about educational/career advice. I'm not sure if it would fit on another site in the network (maybe Academia or Mathematics or something else?), but if we find a good place for it, we can migrate it.
May
17
comment Why is pseudorapidity defined as $-\log \tan \theta/2$
@Paganini can you point me to a reference?
May
17
comment Chemical potential
Just a note for future reference: please don't make large numbers of edits to a single post. Try to make your changes in batches, so that the total number of edits is low. Typically once you edit a post 4 or 5 times, that should be plenty.
May
16
comment Wearing sunglasses during a solar eclipse
Oh, no worries, even those of us who have been here for years have a hard enough time figuring out these things among ourselves. And it's not actually written down anywhere obvious that safety questions are not to be asked here, so I wouldn't expect you to know without someone pointing it out.
May
16
comment Wearing sunglasses during a solar eclipse
@BrianFunt I didn't say that having to do with safety automatically makes a question not physics; of course that isn't true. But we do not provide safety recommendations on this site. A question that is really about physics can always be rephrased in a way that makes it about physical effects and not about whether something is safe. (Which raises the question of why we have a laboratory-safety tag, but that question is probably a matter for Physics Meta.)
May
16
comment Wearing sunglasses during a solar eclipse
I'm voting to close this question as off-topic because it's about biology and medical safety. Brian, as a start to making this on topic here, I'd suggest phrasing it as a question about the UV flux during a solar eclipse, or whatever physics concept you want to ask about, not a question about whether it's safe to do something. Roughly speaking, take out any mention of safety, human eyes, or looking at things.
May
16
comment How to guess the correct fitting function to some data?
@AlexeyBobrick hm, okay, I see what you mean. In general, I stand by my opinion that the "right" way to do it is to take the functional form from one or more preexisting models, but I suppose it will be worth an edit to allow for other cases.
May
16
comment How to guess the correct fitting function to some data?
@AlexeyBobrick yes, that's intentional, because that interesting mathematical problem is not really within the scope of physics. In other contexts it's certainly possible that fitting an arbitrary function to data is useful.
May
14
comment Why do people make distinction between science and philosophy?
I've deleted an unproductive comment discussion.
May
9
comment What pattern would emerge in a double slit experiment in which you tried to measure the particle before the slits?
I deleted a comment discussion that was getting a little out of hand.
May
8
comment Have some queries about Fourier transform
This also sounds like a matter for Signal Processing or Mathematics. I don't really see the physics in it.
May
8
comment How to mathematically describe a spin-0 particle
I've deleted the comments since this is not the place to hold discussions.
May
8
comment How to mathematically describe a spin-0 particle
I've moved the conversation to chat to provide an avenue for discussion of the question, if anyone wants to do it. Comments are not for extended discussion though.
May
8
comment What areas of research question the existence of the Planck length?
It doesn't make sense to question the existence of a mathematical definition.