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bio website ellipsix.net
location Wuhan, China
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visits member for 4 years, 6 months
seen 2 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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3h
comment What are the units of the creation and annihilation operators?
That is the right way to do it, by the way: leave your question as is and post an answer that explains it.
4h
comment Integrating Charged Bodies
What do you mean by "integrate a charged body"? You can integrate functions, not objects.
9h
comment What exactly is NASA's proposed mechanism for “propellantless” “EM Drive” propulsion?
@tcamps you've hit on an issue that we have some internal debate about. I think it's reasonable to ask whether there is a journal paper, conference presentation, or arXiv preprint that explains a particular effect (of course it seems the answer you'll get is no, there is not). But others think differently. It might be worth bringing this up on Physics Meta, if nothing else so that we make the discussion explicit. (Perhaps I'll do it later, but you're welcome to do so first.)
21h
comment Relationship between Theoretical and Experimental Physics
I don't think this is on topic here. You could see if it would go on Philosophy.
23h
revised Rapidity and the momentum 4-vector
deleted 48 characters in body
23h
answered Rapidity and the momentum 4-vector
1d
comment What is the uncertainty principle?
Comments are not for extended discussion; this conversation has been moved to chat.
1d
revised Why does a reaction force still allow the thing exerting the force to move?
improve formatting and title
1d
comment What exactly is NASA's proposed mechanism for “propellantless” “EM Drive” propulsion?
From a quick look, I tentatively think this is on topic for the reasons outlined in previous comments. That being said, we do need to be careful in general about what EMdrive questions we allow, since the topic straddles the boundary of non-mainstream physics.
2d
comment Light - What is it?
What have you done to try to find the answer yourself? For instance, if you look at the relevant Wikipedia page, why doesn't it answer your question?
2d
revised Is time dilation based on the formula for period of a pendulum?
improve formatting and title
2d
answered What does it mean for a particle to have spin of 2?
2d
comment Light follows the shortest path, but to where?
@KristofferRyhl (2 comments up) good followup question, which I think illustrates the risk of saying that the photon is trying to reach your eye. It's not really trying to reach anywhere, but once you know where it wound up, Fermat's principle tells you how it got there. That being said, someone could build on Steeven's answer to go into a lot of detail about why that works. (Not me, at least not now; I don't have time)
Apr
30
comment Projectile motion with mass, find the range
As the notice above your comment says, you're not asking a specific physics question. In other words, you shouldn't ask how to do the problem; when you are in the middle of the problem and you run into some conceptual issue that you can't figure out, that's the time to ask. See the homework policy for more information about what kinds of questions we allow and don't.
Apr
30
answered Does time really differs drastically?
Apr
30
comment Why is it impossible to build an air filter that lowers the average velocity of the air molecules in a house?
@user43796 to back up what docsience and Ernie are saying, we expect people asking here to be willing to put in some effort and do their own research as needed to get from the answer they get to the answer they want.
Apr
30
comment We stretch as the universe does
@JohnRennie hm... well, I guess you might be right, but if this weren't closed as a duplicate I would likely have closed it as non-mainstream anyway.
Apr
30
comment Inverting the laws of physics
Just in case you didn't see my response in the flag feedback: use physics.stackexchange.com/contact.
Apr
30
revised What happens if a wind mill rotates in opposite direction?
improve spelling and grammar
Apr
30
comment What does a left-right arrow in a tensor formula mean?
Ah, looks like Qmechanic already did so.