Wiki says about the Kerr metric:
A moving particle experiences a positive proper time along its worldline, its path through spacetime. However, this is impossible within the ergosphere, where $g_{tt}$ is negative, unless the particle is co-rotating with the interior mass $M$ with an angular speed at least of Ω. Thus, no particle can rotate opposite to the central mass within the ergosphere.
I don't get it. Can it be somehow seen that $g_{tt}$ is negative from
And why can't no particle can rotate opposite to the central mass within the ergosphere?
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