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bio website ellipsix.net
location State College, PA
age 28
visits member for 3 years, 9 months
seen 3 hours ago

I'm a graduate student in physics 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!

For matters not related to Stack Exchange, I can be contacted by email at stack@ellipsix.net.


1d
comment Who proposed the bulk-edge correspondence principle?
I edited your second question out of the post, because we prefer to have one question per post. But feel free to post it separately. :-)
2d
comment Why does light travel at the same speed when measured by a moving observer?
@Brian I edited the title of your question to try to more clearly reflect what you ask in the body. Feel free to make further changes or revert my edit, if you don't think this new title is accurate. (But I think the original title would lead people to think the answer is just "yes, it's called special relativity")
2d
comment Deriving the Laguerre–Gaussian equation
@KyleKanos agreed, if it is improved, but I don't think it's clear enough to migrate in its current state. In particular, what assumptions is this equation supposed to be derived from?
Jul
25
comment Recent missed opportunities à la Freeman Dyson
I'm not sure whether this is on topic here but I'm adding the resource recommendation banner anyway.
Jul
24
comment Is speed of light and sound rational or irrational in nature?
@LoganM okay, it's not really that complicated (I was tired), but at least it doesn't remove any of the (slight) complexity that one encounters when measuring spacetime intervals that are not purely timelike or purely spacelike.
Jul
24
comment Definition of causality relation
@user107952 In classical special relativity, event A "could have influenced" event B if the structure of spacetime would allow an information-carrying signal to propagate from A to B. In quantum field theory, it gets a little more complicated, but even in that case, a causal relationship between A and B amounts to the assertion that something that happened at A could influence something that happens at B. (There is a precise mathematical statement of this in terms of quantum fields.)
Jul
23
comment Which ball touches the ground first?
@ivy_lynx see this question (or any of the other related questions on the site) to understand why that effect is negligible.
Jul
23
comment Is speed of light and sound rational or irrational in nature?
@KyleStrand indeed, you're right, since unitless ratios between physical quantities are pure numbers. But as some other answers and comments also point out, the speed of sound isn't a universal constant, it depends on the conditions.
Jul
23
comment Is speed of light and sound rational or irrational in nature?
@Aaron I would say "the speed of light in m/s" is the product 299792458 m/s. Once you divide out the m/s it's not the speed of light anymore, it's just a number.
Jul
23
comment Is speed of light and sound rational or irrational in nature?
@Aaron the numeric part of the speed of light in this particular unit system, $c/(\text{m/s})$, is rational. But the speed of light itself, $c$, is not just a number so I don't think it's accurate to call it rational.
Jul
20
comment What are quasars?
@JohnRennie I would point out that at the bottom of the answer on that meta question, it says people might downvote questions for showing insufficient effort, but as far as I know there's nothing that says a question can be off topic for that reason.
Jul
20
comment Is it possible to go to graduate school in physics with a different undergrad degree?
But to add to that automatically generated comment, you can find some information on this topic at Academia. For example, see this question.
Jul
20
comment Is it possible to go to graduate school in physics with a different undergrad degree?
This question appears to be off-topic because it is about career advice.
Jul
18
comment Why do we test electric fields with positive charges and not negative ones?
@placeholder I suppose so, so I've clarified the wording, though I think it's a fairly standard convention in physics that, when talking about directed quantities like vectors, parallel means in the same direction, not just along the same axis.
Jul
18
comment Twins Paradox Paradox
All this is true of course, but I think it may miss the key conceptual issue, which is how the other twin can be traveling at $c$ through spacetime and yet still be on Earth to meet the traveling twin when he/she comes back.
Jul
18
comment Twins Paradox Paradox
I think this is actually a good question. I'm not quite sure why people are downvoting it. It comes down to the fact that the explanation you're received is not entirely accurate, but it is a common explanation, and I don't fault you for asking about it.
Jul
17
comment Queries regarding the peer review process and examples of where it has not worked out
@PandaBear you might want to register for an account on Academia so you can edit the question if it gets migrated there. I'll give you some time to do that and then send it over, unless they tell me they don't want it.
Jul
17
comment Does time move slower at the equator?
@user12262 we'd really rather you not use line breaks in comments. I've edited your comment accordingly.
Jul
17
comment Noether's Theorem: Foundations
@Freeze_S (4 comments up) yes, it's not only ok, but preferred if you don't add more questions to this post. If you have other questions to ask, please make a new post for each one.
Jul
17
comment How to calculate a collision which is partly elastic and partly inelastic?
By the way, @Nathan, since you mentioned a problem walkthrough in your first comment: if you haven't already, you might want to take a look at our homework policy.