Metric for Infinite Rod in Gen. Relativity

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SUMMARY

The metric for the spacetime surrounding an infinitely thin, infinitely long, uniform rod can be expressed in the form ds² = A(r)dt² + B(r)dr² + C(r)dh² + r²dθ². This formulation aligns with the characteristics of a Tipler cylinder, particularly when considering a small radius and zero angular momentum. The discussion emphasizes the need for expert validation of this approach, indicating that while the proposed metric appears promising, further analysis is necessary to confirm its accuracy.

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  • Basic grasp of differential geometry
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What is the metric for the spacetime around an infinitely thin, infinitely long, uniform rod? Could it be written in the form

ds2 = A(r)dt2 + B(r)dr2 + C(r)dh2 + r22

where h is the coordinate along the rod and r is the radial coordinate, or would it be something more complicated?
 
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Maybe I'm wrong, but my first impulse would be to model this as a special case of a Tipler cylinder, with small radius and zero angular momentum, in which case your ansatz looks pretty good. Let's wait and see what the experts say :smile:
 

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