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Does the rotation of a massive body affect its $g$-field according to GR?

Physics Asked on April 10, 2021

I want to know, according to GR, if a fast-rotating massive planet/star would affect its gravitational field. Especially, I want to know if, besides an ordinary $g$-field, there appears some kind of Coriolis effect. For a better perception, consider the following example:

A compartment is parted from a massive plant by a column all at rest WRT each other. Suppose that that end of the column located on the planet is frictionless so that as the planet rotates about its center, the column, as well as the compartment, does not rotate. (One end of the column slides onto the surface of the planet as the planet rotates, that is.) We know that if the planet does not rotate about its center, there is an ordinary $g$-field inside the compartment defined by the Schwarzschild metric. However, what if the planet rotates very fast, say, close to light speed? Is there something like the Coriolis force detected by the observer inside the compartment?

One Answer

Yes, all gravitational effects of a rotating black hole are described by the Kerr metric.

Anything made of matter such as a planet or star will fly apart owing to centrifugal force long before it gets anywhere near light speed.

Answered by m4r35n357 on April 10, 2021

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