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Ricci Tensor of FRW 
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#19
Mar3112, 02:47 PM

P: 19

How the does Ricci tensor equation looks like then? [itex] R_{rr} = R^{\mu}_{r\mu r} + R^{\nu}_{r\nu r} [/itex] Since [itex] R^{\mu}_{r\mu r} = a\ddot{a}[/itex] and [itex] R^{\nu}_{r\nu r} = a\ddot{a}[/itex] [itex] R_{rr} = 2 a\ddot{a}[/itex] that's not correct. I don't know I am getting confused. I am not seeing how we get [itex]\dot{a}[/itex]^{2} 


#20
Mar3112, 03:07 PM

P: 939




#21
Mar3112, 03:19 PM

P: 19

[itex]R^{\mu}_{x\mu x} = R^{t}_{xtx} +R^{x}_{xxx} + R^{y}_{x y x} + R^{z}_{xzx}[/itex] right? But the second term is zero and 3rd and 4th term does not have time in it so I will not "a" contribution from them 


#22
Mar3112, 03:21 PM

P: 19

I think I got it.. Thanks a lot



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