Recent content by tarquinius

Oh yes, I knew about the historical importance and the time when space telescopes simply were not an option. I was thinking of some present day applications. While reading online, I came across an article claiming that the ground based observations during eclipses are better suited for imaging...

I was wondering whether there is an actual scientific point of taking ground-based photographs of the Solar corona during total eclipses on Earth. It seems to attract a lot of attention from well equipped amateurs around the world and the pictures of the fine plasma structure surely look great...

I think it is highly competitive.

Yes, I got accepted, although I am still waiting for the precise details of my project (should be GR). I've been told it's a highly oversubscribed programme (~100 applicants) and only a handful of places. I suppose you will hear from them soon-ish, as they apparently have waiting lists for...

Hi, I got a reply on Thursday.

Thank you very much.

Hello there, I have no idea how to solve the differential equation y''(x) + A sin(y(x)) - B = 0 , where A and B are positive real numbers. I do also have initial conditions: y(0) = 0 and y'(0) = 0. I would be grateful for any help.

Hello there, could anyone help me with a certain basic problem in relativistic QM? What would be the wave function of a photon (or generally a particle with zero rest mass) in a spherical 3D cavity, having potential energy V=0 within the cavity and V=k outside the sphere (k>0)? I have been...

OK. That's what I expected. I just wanted to be sure that the resulting metric can't be produced in such a simply way before starting deriving the tensor from the field equation.

And does this Weyl solution work the way I have described above? Would it be possible to just add the metric of each body in order to obtain the resulting one?

Hello there. I would like to find the metric tensor produced by the existence of two massive bodies. Does the principle of superposition work for metrics as well? The first idea I got was to add the two metrics for each separate body in order to obtain the resulting one. Is this approach valid...