Recent content by tartaneto

Thank you all for the answers, it helped a lot

Yes, it can be only for the flat case. My point is: in order to get the metric growing either I can keep the space component growing or the time component decreasing and that is the reason of my question if the are equivalent or not.

The generic FLRW metric is dS^2 = a^2.(dx^2 + dy^2) - (c.dt)^2. Is it equivalent to the metric dS^2 = (dx^2 + dy^2) - (c.dt/a)^2 with the scale factor in the denominator of the time dimension? (I suppressed one dimension just for simplicity). Thanks for the help.

Thanks for the clarification on terminology, Simon. But how would that answer my question? The magnetic field experienced in our frame of reference is perpendicular to their motion and does not affect each other, or does it? I mean, the magnetic field won't generate any force between them...

Hi guys. I have something stuck in my head since a few days and I'd like to have your opinion about that. I don't know if I am missing something in my assumptions so please feel free to enlighten me. Here's the thing: considering two protons (or electrons), one fixed at the origin of the frame...