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bio website ellipsix.net
location Wuhan, China
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visits member for 4 years, 10 months
seen 4 hours ago

I do not respond to off-site contact about moderation. Any moderation questions or comments should go on meta, or bring it up in chat.

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.


1d
comment Does spaghettification really happen with conditions found close to a black hole?
@Asher that should probably be an answer
1d
comment Why don't photons split up into multiple lower energy versions of themselves?
I think it's worth mentioning the collinear case more prominently. The equivalent process with gluons plays a large role in QCD.
2d
comment What are quarks made of?
@BT and Ron: I've moved the comments to a chat room, so if you two really want to keep going in this vein, do it there, but consider this a reminder that rudeness (as exemplified by a few of the moved comments) is not acceptable on this site.
2d
comment Does a wormhole on the event horizon keep working?
Comments are not for extended discussion; this conversation has been moved to chat.
2d
comment Would a fast moving (approaching $c$) stream of particles be affected by the gravitational pull of a gas giant?
Hi, and welcome to Physics Stack Exchange! Did you try anything to figure out the answer yourself? If so, you should mention it in the question. We expect people to do a certain amount of investigating on their own before posting here, and the answer to this should be easily available in many other places.
2d
comment Laws first, matter and energy second?
I'm voting to close this question as off-topic because it appears to be about philosophy.
2d
comment Is it physics that leads to development of maths or is it maths that leads to the development of physics?
I think this is off topic, though it might fit at History of Science and Mathematics.
Aug
25
comment Why is space a vacuum? Also, why doesn't air from the Earth escape into space?
@zwol nope, not going to happen. It's actually irrelevant whether or not the comments answered the question; comments are always ephemeral. That's part of the core principle of the SE network, so if you want to contribute somewhere where all your comments will stick around, I'd suggest looking for another site, like a traditional forum. (If you want access to the text of the comment so you can post it as an answer, ask on Physics Meta, just don't make a habit of it.)
Aug
24
comment Why is space a vacuum? Also, why doesn't air from the Earth escape into space?
I deleted a couple comments that were actually attempts to answer the question.
Aug
23
comment Obtain the Lagrangian from the system of coupled equation
@diracpaul, please try to limit the number of edits you make to your answer. Each post should only be edited a few times, like 2 or 3, in most cases. When you really must edit, go through and change everything that needs changing.
Aug
23
comment Which 'error' to choose random or absolute?
Related (possible duplicate, though currently without an answer): physics.stackexchange.com/questions/73785/…
Aug
23
comment Which 'error' to choose random or absolute?
What do you mean by "absolute error"?
Aug
23
comment Showing that the magnetic field inside an infinite current carrying cylinder is zero
@KeithMcClary that should be an answer
Aug
23
comment Showing that the magnetic field inside an infinite current carrying cylinder is zero
Ah, gotcha. I'm a little distracted I suppose.
Aug
23
comment Showing that the magnetic field inside an infinite current carrying cylinder is zero
It's not fixed though. The contradiction is that, in the first paragraph, you say you've showed that $\vec B\neq 0$ inside the cylinder, but then in the second paragraph you are trying to show that $\vec B=0$ inside the cylinder. They can't both be true.
Aug
23
comment Euclidean geometry in non-inertial frame
Comments are not for extended discussion; this conversation has been moved to chat.
Aug
23
comment Euclidean geometry in non-inertial frame
Comments are not for extended discussion; this conversation has been moved to chat. (However I've deleted a few comments that were inappropriate for various reasons, as well as some replies to them.)
Aug
23
comment Showing that the magnetic field inside an infinite current carrying cylinder is zero
There seem to be some mistakes in your writeup. In your second paragraph you mention the electric field, which I'm guessing was a typo? More importantly, in the first paragraph you say you showed that $\vec{B} = \frac{a}{r^2}[\cdots]$ inside the cylinder, but did you mean to say you showed that for outside the cylinder?
Aug
20
comment Would opening a car door at high speed change the path of the car?
If you can't think of a way to edit it that might make it appropriate, and you don't want to wait for other people to help you edit it to make it appropriate, then you can delete it. But you're not obligated to delete it.
Aug
19
comment Nothing cannot possibly exist, right?
Comments are not for extended discussion; this conversation has been moved to chat.