Hi, I am working through GR by myself and decided to derive the Friedmann equations from the RW metric w. ( +,-,-,-) signature. I succeeded except that I get right value but the opposite sign for each of the Ricci tensor components and the Ricci scalar e.g. For R00 I get +3R../R not -3R../R . I...
Good luck!
I'm teaching myself using Schutz and various webpages. I get the impression a lot of so called "Introductory" books are too short and don't 'talk through' the steps in a long series of equations to really justify the tem "Introductory". It's a shame as many people are enthusiastic...
Hi again,
Thaks for previous help. I am self studying GR using Schutz and Dunsby's webpages & notes.
I am stuck on a step in the derivation of the weak field approximation.
They approximate the metric with g[a][/b]=n[a][b]+epsilon h[a][b]
In step 7.30 the partial derivative h[i][0],[0]is...
Hi everyone! I am trying to self- study GR and I am (very slowly) working through Schutz at the moment ( not the clearest at times for a " first course" text). Anyway I have noticed that several times when working with components of physical variables e.g. momentum/ energy, the 'up' index in say...
Hi, just found your question today. I am working through Dunsby's webpages which are almost identical to Schutz's" Introduction to General relativity". Ok , my understanding of eqns 92 to 97 are...
He finds the change in the component V alpha when parallel transported around the loop to get...
Hi Peeps,
I'm new to this forum and self study QM. This thread raises an interesting question for me. How does science picture say an electron traveling in a straight line. The prob. amplitude wavepacket travels wth the velocity of the electron.! When we make make a measurement of its position...