"We present a class of curved-spacetime vacuum solutions which develop closed timelike curves at some particular moment. We then use these vacuum solutions to construct a time-machine model. The causality violation occurs inside an empty torus, which constitutes the time-machine core. The matter field surrounding this empty torus satisfies the weak, dominant, and strong energy conditions. The model is regular, asymptotically flat, and topologically trivial. Stability remains the main open question." - link

Well that's alright then.

I suspect that given free reign with this wondrous idea The Simpsons could, if left unchecked, develop into a fully blown science fiction paradise. Knead the folds of gravity into a time morphing doughnut shape (or torus for the more scientifically enabled amongst you) and use it to go back repeatably to times which have occurred since its creation. Its a common theme in recent Time Machine constructions, sad thing is, these constructions only occur in the imaginations of theoretical physicists and are very likely to stay there. The portable De Lorean/Phone Booth time machines, so lovingly crafted by 1980s Hollywood fiction have yet to make it onto the physicists drawing boards. I for one am disappointed.

For the time being keep picturing gravity as a malleable aspect of reality and in time hopefully all deep fried dough products will start to send you back in time.

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