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I am wondering whether supercomputers are profitable! I am no computer engineer/scientist, but it seems that it could be. I tried to search on google, on whether supercomputers are in fact profitable, but I couldn't find a suitable source. Also, with the rise of cloud computing such as AWS, I...

Hi, I have been studying Quantum Field Theory this semester! It seems that Shwartz and Peskin are the most popular choices when it comes to studying QFT. But apparantly my professor have another "old" preference. He strongly suggested that we learn QFT from Zuber's book. I have looked at the...

Hello everyone, I would like your advice on the matter of internships... Usually every year, no matter the situation, I apply for internships/training for the summer... Sometimes I succeed in finding one and sometimes I fail. It became a habit to always search for internships (Hopefully a good...

I am revising perturbation theory from Griffiths introduction to quantum mechanics. Griffiths uses power series to represent the perturbation in the system due to small change in the Hamiltonian. But I see no justification for it! Other than the fact that it works. I searched on the internet a...

Hi, I have been accepted in one of the top universities in Germany. The program starts not very far from today (Summer 2020). Problem is that I have just established myself in my career as a teacher and I do not have a lot of money to support myself abroad. (just started two months from now)...

Simple as it sounds! Usually people derive aberration of light using linear motion, not circular motion. When aberration happens in linear motion, one would expect distance between the source and the observer to change. But, in circular motion, the path light takes in the circular motion, in...

I am no engineer, just a physicist. I usually do not work with such problems, so I basically do not know what to look for to begin with. My question/questions goes like this, take the following situation: Fetch a paper, such single paper is easy to bend. If one takes glue, and glue this...

Summary: Why parity have vectors and pseudovectors? why not only vectors? I am reading Griffiths "Introduction to elementary particle physics" Ed.1. The book obviously is an undergraduate introduction.Thus, not much detail is presented, but I cannot get my head around pseudovectors...

Hello everyone, Upon my comment on the insight "Applying for Physics Graduate School - Comments", Mr. Bill (bhobba) suggested that I need to write an individual post regarding my inquiry. I am looking for physics graduate programs (PhD). My senior project/thesis was on classical field theory...

Hello everyone, I am trying to acquire the data used to make solar images like in this link. For various wavelengths, but mainly for visible. And, honestly I am having a problem finding the data. I am assuming that these images are made using a set of data for each, am I wrong? I don't have...

I am taking one year break to work and relieve myself from the burden of the university. I studied physics and minor mathematics. I will apply to PhD or Masters next year. (I will take the GRE next year too). I took the following materials for my minor math: - Real Analysis - Abstract Algebra -...

Homework Statement Homework Equations $$\mathcal{L}=T-U$$ $$\omega= \frac{d\phi}{dt}$$ $$I=mr^{2}$$ The Attempt at a Solution My problem is not finding the Lagrangian. But finding the kinetic energy! The translational kinetic energy would obviously be the following: $$K.E...

My question is related to the book: Classical Mechanics by Taylor. Section 7.8 So, In the book Taylor is trying to derive the conservation of momentum and energy from Lagrange's equation. I understood everything, but I am struggling with the concept and the following equation...

Hello, I was wondering. Is the exponential function, the only function where ##y'=y##. I know we can write an infinite amount of functions just by multiplying ##e^{x}## by a constant. This is not my point. Lets say in general, is there another function other than ##y(x)=ae^{x}## (##a## is a...

Hello, I have been wondering about the validity of Maxwell's equations in quantum physics. I looked in the internet and it seems from what I understood that: Maxwell's equations are valid for any situation, classical or quantum. In fact, maybe it holds more legitimacy than Schroedinger...

Hello, Lately, I have been interested in philosophy and in particular the branches of philosophy where there is a tie with mathematics and physics. From this point, I think the best branch to start studying would be the most robust one for scientists. i.e Logic. But I am having a problem...

Hello, I am not sure if these types of problems are Intermediate or advanced. I am not sure too whether they have a certain name or not. I have a function inside a definite integral. The solution of this definite integral is known. What is the function that satisfy the known solution. In...

Hello, I see a lot of people enthusiastic about Clifford algebra and its future role for physics, yet I also see a lot of people frustrated opinions about it. Contents in the internet seems really really small compared with other mathematical topics, not to mention less books about it. All...

Recently I have been rejected by nearly every institution/university I applied to, this summer. I do have a previous experience "summer internship" from last year. Also, I don't think I am that much bad to be rejected by that much handful of institutions. Anyway, I am not complaining. I am...

< Mentor Note -- thread moved to HH from the technical math forums, so no HH Template is shown > I couldn't find more informative title! I find difficulties with proofs. So my solution might be weird The problem says "Suppose that x is a fixed non-negative real number such that, for all...

Hello, I am trying to solve two different questions, and I am having trouble finding the solution: 1- Spherical shell of radius R, have two hemispheres of different charge density. The northerns hemisphere is +σ and the southern hemisphere is -σ. Use direct integration to find V inside and...

Hello, I know how to use latex, and some how I want to write that in my CV, but its really unprofessional to do that! so I am thinking of writing my CV and my personal statement instead with latex, and so if someone is interested in such a skill (Which isn't that much of a thing) he will...

Hello, I had a discussion with my professor. He tried to convince me but I couldn't understand the idea. The Stokes Theorem (Curl Theorem) is the following: My professor says that the value of the equation should be zero whenever the area of integration is closed! (which will make a volume...

Hello, I have a department elective course called "Differential equations theory" but I have no idea if it is going to be useful for me as a physicist (I'm interested in the theory/ minor math). The description of the course is as follows : The fundamental theorem of existence and autism...

Hello, Right now I have the opportunity to study and work in my university as a part time technician!. I've searched the web, everyone seems to dislike and discourage the idea (because of the time, wage and other things). Here my situation is somehow different than common situations. In my...