Recent content by Salah93

Thank you for the encouragment!

Have you direct/indirect experience? I know. But I come from a strong master course(not only part III exists...), from a european country, and one of the supervisors is interested in me. I think this counts something.

I am applying for a PhD possition at DAMPT, Cambridge University. How many interviews are there? And for the academic one, with the possible supervisor, does he test your knowledge? Which are the most common questions? I have a strong research, very good letters, a good motivational letter but...

The position is 3 years. I will work for a project with a specific professor. So I think is the latter case. NOw I am applying for the graduate Cambridge (where they check the grades I think and there are also the letters from my profs) Then I will send my Motivational letter and a Cv to the...

I am on my fifth year, I. E. Msc. (Italy is 3+2) TThe university for now is Cambridge for a theoretical position. Have you some advice?

HI all, I am physics student at his last year in Italy. I'm in one of the very top uni in Italy and Europe(with very strong research). I was able to enter this uni by a very hard test, similar to the physics olympiads. I was the typical top student that sometimes gets top grades and other times...

Ok, I write the equations that I obtain(one can use action variation with an affine parameter, or EL eq. with affine parameter or use directly geodesic eqs with affine parameter by first calculating Christoffel symbols): $$\ddot{t}=\frac{Ak}{2}sin(k(z+t)) (\dot{x}^2-\dot{y}^2)$$...

I solved the excercise and made all the necessary calculations and obtained the correct results. What I asking is a more theoretical question, to justify what I did. If the question is not formulated well please tell me.

I was trying to solve this excercise: Now I was able to find the eq. of geodetics (or directly by Christoffel formulas calculation or by the Lagrangian for a point particle). And I verified that such space constant coordinate point is a geodetic. Now, for the second point I...

Hi guys, I am an italian student in the first year of Msc in physics. I'd like to make a good Physics Phd in USA/Canada in one of the top 30 cosmology schools(I know some good place in Europe, such as ETH, Scuola Normale di Pisa,...). I'd like to make theoretical cosmology. For now I'm...

Ok, I think that in general what I did is right. But I made a big mistake! \frac{d}{d\eta}(2a^3\lambda)=0 gives a^3\lambda=A that is obvoius! A is a constant And then I obtain a(\eta)=-\frac{A}{6}\eta^2+B\eta+C. B and C are real constants. And how can I get the value of the constant A? If A...

Can at least someone check if the variation of the action w.r.t a is correct?

Homework Statement The aim is to find a solution for the scale factor in a Robertson Walker Metric with a scalar field and a Lagrange multiplier. Homework Equations I have this action S=-\frac{1}{2}\int...

Sperimental Physics 3 and Nuclear Physics and Geometry. For now I want maybe to be a theoretical physicist in cosmology.

Hi, I am an italian physics student. I know that this is a recurrent topic but I want some specific advice. This year I am completing my third year of university to get my bachelor degree. Then I have to get my master. In these three years I got a lot of very good-top grade, and 2 average-bad...