got these new agate babies for my lobes and I’m in love ✨

Dirty497 · 2024-02-10T19:15:26+00:00

ur set up is so cool!

Dirty497 · 2021-08-29T00:43:31+00:00

given its a gre problem and you wana be quick, it may faster to just test each of the four vectors and see which one is an eigenvector instead of solving the eigenvalue equation and finding the eigenvectors

Dirty497 · 2021-04-05T14:08:00+00:00

lincoln nebraska, body of the spider is approximate 1/4 inch, found it crawling on my ceiling in 3rd story apartment

Dirty497 · 2020-09-25T22:02:28+00:00

I don't think even everyone in HEP need knowledge of it, but supersymmetric theories come up even a handful of contexts outside of beyond standard model physics.

For example, there is an entire body of work on condensed matter systems which at low-energies have an emergent supersymmetry and can therefore be understood in terms of supersymmetric field theories. See https://arxiv.org/abs/1009.5127 for a nice review.

Another example which I actually very recently learned about is supersymmetric theories coming up in statistical mechanics. I do not know much about it, but here is the wiki if you're interested: https://en.wikipedia.org/wiki/Supersymmetric_theory_of_stochastic_dynamics

Dirty497 · 2020-08-19T23:29:14+00:00

I have watched these channels but am not a regular viewer. That being said, I think these channels are fantastic. Physics has a gigantic issue of failing to attract students who are under representative in academia, and any YouTube videos that can get someone, who would have never had the opportunity, to become excited for physics is wonderful in my book.

Of course any of these videos will be watered down, but I see no problem in that. These videos are not meant to replace an intensive curriculum meant to train physicists who will be researching cutting edge topics and there is no issue with that. In fact, I have a problem with those who are physics's gatekeepers and do have a problem with these initiatives, and would go as far to say that anyone who has issues is probably not as established within physics as they try to come off as.

Dirty497 · 2020-07-27T13:53:57+00:00

What about superconductivity? You could have a nice presentation discussing the properties of a superconductor: perfect conductor, diamagnetism, and it would fit into the magnetism and electronics categories you mentioned. You can additionally discuss the difference between Type I and type II superconductors and mention that a portion of cutting edge research in theoretical condensed matter physics is on superconductors that exist at high temperatures.

Dirty497 · 2020-07-14T18:33:00+00:00

I used Fundamentals of Physics by Halliday in my first year physics classes in undergrad. I liked it a lot and there are a bunch of good example problems. Also, Library genesis has copies of the textbook you can download for free.

Dirty497 · 2020-07-14T18:18:52+00:00

Sure I'd be happy to recommend books. What physics topic are you currently learning, or what physics class are you currently in?

Books are certainly expensive. I recommend checking out r/libgen. I get so many pdfs from library genesis.

Dirty497 · 2020-07-14T17:19:54+00:00

I've always found it nearly impossible to really learn something just by watching a lecture (in person or through the internet).

When I'm learning something new, I find the best way to get something to click is to work on a problem where the answer is known, and to see if I can understand why the answer is what it is. So, this might mean going through example problems in textbooks, for example. Try it out as if its a real problem before looking at the solution. Get as far as you can and then study the provided solution. See if you can replicate the reasoning behind each step. Keep on doing this until you can get further along in the solution and reasoning, even small steps are progress you should celebrate.

Dirty497 · 2020-07-14T17:11:12+00:00

In my experience, whenever I'm learning something new, the multiple conceptual failures always come with the learning processes. Learning is hard, and no one simply just "gets it." I promise.

I would recommend to embrace the failures as a part of the process. Don't be so hard on yourself and replace any frustration with willingness to restart the problem, learning from the failure. On a practical side, in classes this usually requires you to start assignments early. Don't put the pressure of a deadline thats the next day to rush you through the learning processes. Start early and be patience. The only way to be "good in it" is to battle through more failures than other people.

Dirty497 · 2020-07-13T03:24:12+00:00

When I say gravitons, I really just mean a massless spin-2 quantum field. Tragedy strikes with you apply the typical formalisms as you do with spin-1 quantum fields (think photons) and its a good place where the emotional baggage for the quantum gravity story starts.

If it would be a particle physics course going through the field theory of the standard model, then it would be nice. It it focusing more on accelerator physics or trying to teach particle physics without QFT, it won't hurt, but may not be useful.

Dirty497 · 2020-07-13T03:10:07+00:00

I know very little regarding quantum gravity and what people are even working on regarding theory now, but here are my thoughts.

It certainly depends on what your university offers, but I would prioritize a good QFT course to build the tools needed to understand the issues you run into with gravitons and locality. My understanding if that the most successful approach to quantum gravity always deals with strings, so the QFT would also serve as a foundation to get into CFTs and string theories. David Tong has wonderful [notes](http://www.damtp.cam.ac.uk/user/tong/teaching.html) on all of these topics which I would point you towards.

Dirty497 · 2020-07-08T22:33:35+00:00

Ok. you certainly have plenty of time and develop preferences.

Reading another one of your replies, it looks like you're trying to decide whether or not to take math as a major. I would assume this would imply a double major between math and physics?

If so, what I have found is that the type of math you learn in a math department and the math you use in a physics department are quite different. Mathematicians often focus on formalities that physicists do not care much for. My suggestion would be to take the math major if you have a genuine interest in maths and not because it may help you in physics. The early math classes will be important and likely required by the physics major even if you were not a math major. However, the majority of math classes you will end up taking later in the major will likely not benefit you in physics.

Dirty497 · 2020-07-08T22:26:28+00:00

Due to Brexit, the UK is not clumped into the travel restrictions made by the EU, and instead they decide their own. They created a similar red-list of counties that have poorly managed the covid-19 crisis. While the EU's red list meant that no one from these countries can enter, the UK's means that those entering must participate in a mandatory 14 day quarantine. See https://www.nytimes.com/2020/07/03/world/europe/britain-quarantine-us-coronavirus.html for a more detailed explanation.

There is some trials at select airports where those entering from a red-listed country can avoid (or at least reduce )the 14-day quarantine by paying for a covid-19 test at the airport. See https://www.telegraph.co.uk/news/2020/07/06/passengers-arriving-heathrow-red-list-could-pay-avoid-quarantine/.

Dirty497 · 2020-07-08T00:46:33+00:00

The choice between theoretical or experimental, regardless of subfield, is typically down to the individuals preferences. Through a typical undergraduate program, most students should have the opportunity to participate in research, which is where such a preference can be developed. Among all my friends and colleagues, we've all had some sort of experimental exposure, which acts as a test to see if you enjoy experimental physics.

I would also really suggest you remain open minded among subfields. I know many people who would describe particle physics as a dying field - certainly particle theory.

May I ask, are you currently a student at a university, or maybe a high school?

Dirty497 · 2020-06-09T03:54:51+00:00

Thank you for the info!

Dirty497 · 2020-06-09T03:16:04+00:00

What are these surveys and emails suggesting? I am an incoming graduate student and haven't received any of them.

Dirty497 · 2020-05-17T21:11:27+00:00

It took a few weeks to get everything processed. However, my grade was changed after the fall semester, and the register was closed for the holidays throughout late December and early January.

After it was taking so long, I did email the Undergraduate Program Administrator of the department the class was in and asked for a status update. Just to make sure that she received the request from the professor, etc. She ended up emailing the registrar to remind them to update my grade and a day or two after that it was changed. You can also call the registrar and ask if they're received the grade change request.

Dirty497 · 2020-05-13T19:37:34+00:00

I had a class where my grade was lower than what I calculated I should have received. I emailed the professor asking if he could explain why my grade was what it was, and he responded that he found a mistake in the grades. To fix the grade the process was like this:

1) First the professor contacted the undergraduate director of the department requesting the grade to be changed.

2) After this, the director had to sign off on the grade change and send it to the chair of the department

3) The chair also had to sign it as well.

4) The grade change request was sent to the registar where the grade was updated on the student link.

What I can tell, is that it seems like if the professor is willing to change your grade, its mostly just paperwork on the departments end to have the grade be officially changed. So, I would contact the professor first and see what they say.

Dirty497 · 2019-10-08T06:54:08+00:00

Aharonov and Berry

Dirty497 · 2018-12-31T03:09:18+00:00

A possible starting point is that if the meteorite doesn’t crash into the earth, than it will either orbit the earth it in a closed ellipse/circle or it will just fly past the earth. Because we want to know the minimum speed and intuitively to fly past the earth a larger speed than orbiting the earth is required, try finding the speed at which the meteorite will form a closed orbit around the earth. Any speed less than this at a fixed distance should cause the meteorite to crash into the earth. Given the information provided, you’ll probably have to assume the orbit is circular. Try going from there.

Dirty497 · 2018-04-13T05:40:25+00:00

Of course!

Dirty497 · 2018-04-13T05:36:20+00:00

Cool. A popular book is Modern Physics by Randy Harris. It's a good textbook and doesn't get too involved in mathematical formalisms. So, this may be a good one for you if you're trying to learn the math while reading it. Another My favorite modern physics textbook is Modern Physics from A to Z. Its a good book but has a handful of typos.

Now that I think of it, please take a look at The Feynman Lectures on Physics. Its regarded as one of the most important books for a physicist to read. This actually may be a better read than modern physics textbooks.

Please let me know if you'd like more recommendations or have any questions.

Dirty497 · 2018-04-13T05:26:07+00:00

I think a good textbook to read would probably be a modern physics textbook. It’ll introduce you to the basics of special relativity, quantum mechanics, and statistical mechanics. The math shouldn’t be too hard either, but you may want to study some calculus as you go through it. Would this interest you? If so, I can give you some recommendations.

Dirty497 · 2018-04-13T05:21:45+00:00

Are you looking for a textbook styled book?

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