44,748 reputation
2080175
bio website ellipsix.net
location Wuhan, China
age 29
visits member for 4 years, 8 months
seen 27 mins 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!


20h
revised Do quasars exist today?
edited tags
1d
comment Can a mouse rotating a wheel violate conservation of angular momentum?
I've deleted some off-topic comments.
1d
revised What really generates time evolution?
add an important caveat that a != 0
Jul
1
comment Energy and momentum of a relativistic electron
Incidentally, in high-energy particle physics we do often use $p\approx E/c$ even for massive particles, when the particle's mass is so small as to be negligible compared to its kinetic energy.
Jun
30
comment Clarifying some notation, the square of a vector derivative
@lemon that should be an answer!
Jun
30
comment Problem in solving numericals involving vectors
I'm really not sure what you're asking. Could you be more specific?
Jun
30
comment Need help please
I'm curious as to why someone upvoted this
Jun
27
comment How do you know when you need to use distributions to represent charge densities?
I think the question in the edit is actually a good one: how do you recognize that you need to use distributions? I've edited the question to emphasize that aspect of it. (Naturally, without that, I would have added my close vote.) I've also deleted now-obsolete comments posted prior to the previous edit.
Jun
27
revised How do you know when you need to use distributions to represent charge densities?
emphasize the question about using distributions
Jun
26
revised Is magnitude of velocity same as speed?
fix error
Jun
25
comment Is magnitude of velocity same as speed?
@TimKrul I've edited my answer accordingly. But keep in mind (for the future) that it's best not to edit extra questions into your post. Editing to clarify the questions you've already asked is fine, but when you have a new, separate question, it's best to make a separate post.
Jun
25
revised Is magnitude of velocity same as speed?
add answer to extra part of question
Jun
25
answered Is magnitude of velocity same as speed?
Jun
24
answered What is the nature of the state of a 2 particle system?
Jun
24
revised Why dont we consider force exerted by atmospheric pressure in mechanics?
transcribe problem and improve formatting and phrasing
Jun
24
comment Why dont we consider force exerted by atmospheric pressure in mechanics?
Actually the right way to handle this (cc @DavidHammen) is to transcribe the problem into text, not to post a different image. Posts shouldn't contain images of text or math. I'll do it this time.
Jun
24
comment What is the radius of the event horizon?
I would actually suggest editing your comment into the answer. (Nice answer!)
Jun
23
revised Is it possible for man to break Earth into 2 parts?
make question more concise
Jun
22
revised Why isn't this calculation of the energy of a light wave correct?
edited title
Jun
22
revised Measuring the spin of an electron with spin +h/2 at an axis 30 degrees off
edited tags