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 Exercise [19.13] 
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Joined: 03 Jun 2010, 15:18
Posts: 136
Post Exercise [19.13]
Attached my solution.


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07 Sep 2010, 13:58

Joined: 12 Jul 2010, 07:44
Posts: 154
Post Re: Exercise [19.13]
Just a couple of remarks:

(1) On the line below (*), the term after the rightmost "=" should be 4(\nabla_a F^{ac})F_{cb}. You incorrectly left out the brackets.

(2) Part (b) is probably simpler if you start from the original expression for T_{ab}, rather than from (*).


25 Mar 2012, 10:01

Joined: 03 Jun 2010, 15:18
Posts: 136
Post Re: Exercise [19.13]
(1) I attached here the corrected solution, adding the missing brackets and correcting a couple of spelling errors.

(2) Probably the approach you mention would be slightly simpler; however I found esthetically better not to use the explicit expression for *F, even if it is provided by Penrose at page 443, because I never proved it, even if it would be straightforward to do.


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30 Mar 2012, 14:58
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