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General Relativity An Introduction for Physicists from M. P. HOBSON, G. P. EFSTATHIOU and A. N. LASENBY uses a negative sign.

Wald uses a positive sign..

And so on..

What's happening?

- Thread starter coleman123
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- #1

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General Relativity An Introduction for Physicists from M. P. HOBSON, G. P. EFSTATHIOU and A. N. LASENBY uses a negative sign.

Wald uses a positive sign..

And so on..

What's happening?

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Bill_K

Science Advisor

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I guess that sorts out the issue.^{μ}. If you use η^{μν}= (1, -1, -1, -1) it should be u^{μ}u^{ν}- η^{μν}, while if you use η^{μν}= (-1, 1, 1, 1) it should be u^{μ}u^{ν}+ η^{μν}.

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Thanks Bill. So the metric matters then. In the end I was just using:^{μ}. If you use η^{μν}= (1, -1, -1, -1) it should be u^{μ}u^{ν}- η^{μν}, while if you use η^{μν}= (-1, 1, 1, 1) it should be u^{μ}u^{ν}+ η^{μν}.

T

where "s" is the sign corresponding to the time coordinate.

Where do I find more about this?

Thank you

Last edited:

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That's it. Thanks again

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http://equatorfreq.wordpress.com/2010/08/13/signs-in-einsteins-equation/

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