Recent content by FroChro

You said you have only the very last attempt left. I obviously have no idea what the right decision is, but if you can afford it (both financially and psychically [stress]) and you really like the work, I would say give it a try. If it is possible, work harder than before, and then even if you...

But, for example, you can't reasonably describe black holes using only Newtonian physics. "The key is to keep stuff as simple as possible, but no simpler" - paraphrasing a quote attributed to Einstein. I never meant to sound like I disregard a common sense or that I think it is a somehow...

When you try to solve a complex problem using a method that is too simple, you usually get a wrong answer. The problem is that if you are unaware of the fact that the method was inadequate you believe the answer is right until it is too late. Moreover, practical "common-sense" people often tend...

Well it isn't. Simply because there is no good criterion of success. Is it how much money you earn? Then we have buried concept of universities as centers of free thought they should be and transformed them into human resources factories. Is it how happy graduates are? Well, knowledge often...

As it is, to some extent, true for almost anything. Learning a skill does generally require hard work and practice. Pardon me for arrogance and unjustified jumping to conclusion, but this looks to me little like saying : " I could do that too, but since it is just a matter of hard work, why...

I would not advice to take results of the poll too seriously anyway. Not only that the community of people who visit this forum on regular basis is too small, it is also with high probability an extremely biased sample. (I think towards the negative answer, but actually, I am not sure.) Plus...

The theory of special relativity does tell us how to transform from one inertial frame to another. Imagine spacetime like some kind of "objective" reality with its points corresponding to events. You as observer want to label these points using coordinates. You label each event with three space...

It should be noted that in fact potential energy is in a sense defined so that overall energy of the system is conserved. On the level of Newtonian formulation of mechanics, there is no explicit need for concept of potential energy. The proof given above is precisely speaking proving only the...

Points on the blank manifold *do* represent events. Yes, from the point of view of general relativity, Minkowski spacetime is solution to an empty space, which is physically uninteresting situation, but it is an good and very useful approximation. Moreover STR and GR are just theories, they do...

I think the statement is wrong. Maybe the author meant it in some subtle way. Anyway, who is the author and is it possible to read the notes somewhere on the web?

In differential geometry the idea is that you have a manifold and some other quantities or geometrical objects on it that (both the manifold and those quantities) are quite independent of coordinates we use in their description. Therefore by definition, the coordinate transformation do not...

I haven't encountered Poincare transformation outside of special relativistic settings so far, but I'm no expert either. (Far from it) Also everything that applies to special relativity does in a sense apply to general relativity (equivalence principle), so you maybe could define kind of (local)...

You are intechanging different concepts. One thing is a general coordinate transformation in general relativity. In general relativity we want tensors to represent 'real' physical entities, and therefore we need them to transform accordingly. The law you are referring to is just an requirement...

I think your question is ill-posed. I believe that in times of Coulomb they hadn't known that there is some ''atom'' of charge, much less what is its magnitude.

I'm quite confused here.. shouldn't a property of being a black hole be coordinate invariant? There should be some singularity inside of horizon with some diverging scalar quantity. Moving alongside the particle, no such singularity should be observed.?