Hi PF!(adsbygoogle = window.adsbygoogle || []).push({});

I've begun to read the MTW brick. I have a few questions.

Page 29, (1.5)

I don't understand how these equations are calculated. There is a demonstration below, but I don't understand the part where he adds a [itex]\frac{1}{c^{2}}[/itex] factor to the acceleration

[tex]\frac{Gm_{conv}}{r^{2}}[/tex].

Page 101, 3 lines before (4.8)

I don't understand how he evaluates [itex]<\textbf{d}y\wedge\textbf{d}z,\textbf{u}>[/itex]. There is a definition for evaluating a p-form with a p-vector, but not for p-form with a k-vector.

As a general remark, it's a bit sad that the authors often forget to write the general definitions of the mathematical tools they use.

Page 142, 8th line of paragraph 5.8

[he's talking about the conservation of 4-momentum]

The energy-momentum lost by particles goes into fields; the energy-momentum lost by fields goes into particles.

I don't understand the meaning of this sentence. I understand how particles can lose energy-momentum, but I don't see how "fields" (whatever this is...) can lose or gain energy.

If my questions aren't clear enough, I can type more.

Thanks a lot!

Sébastien.

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# MTW questions

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