On Wed, Jan 8, 2020 at 5:56 AM Lawrence Crowell <
[email protected]> wrote:
> *> Gödel's cosmology violates the Hawking-Penrose condition T^{00} >= 0.
> This corresponds to the closed timelike curves in the spacetimes. The whole
> cosmology has a net angular momentum that frame drags geodesics into closed
> timelike curves.*
>
So you could make a Time Machine if Gödel's solution to Einstein's field
equations was relevant for our universe, but it's not because the universe
we live in doesn't spin.
John K Clark
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