Recent content by Meddusa

I am clearer now. In the notation ds=cdτ where τ is the proper time, right? Thanks a lot !

Thank you all for detailed answers but still I do not feel I got the point. Writing action without (mc) term means what? On wikipedia, derivation of the geodesic equation is starting with S = ∫ ds where ds is specified as "line element"

Hi, I found that action in relativity is written in two ways: 1) S = ∫ ds 2) S= -mc ∫ ds is (1) for non-relativistic particles and (2) for the relativistic particle ? why there is a minus sign in front of it? I read that writing (2) is up to a guess (-mc term), is it very interesting...

Hi ! I have completed my master thesis about black holes recently, will continue Ph.D. This forum is really great, helping me so much. Now, I am a member of "physics forums" also :) nice to meet you all !