Strings and space the shape of the wrapped up spaces

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Unformatted text preview: d the highly curved space and returned to its origin. You might see the back of your head. Time machines – if worm holes exist, then they can, in principle, be used to make a time machine. One mouth of the worm hole will be absolutely younger than the other mouth. Grandfather paradox – the notion that since time machines can violate causality (“cause” before “effect”) a situation, like traveling back in time to kill your Grandfather, can arise that can be neither true or not true. Novikov consistency conjecture – the conjecture that physics must be self- consistent and simply does not allow paradoxes even if time travel exists. Changing the future – if the consistency conjecture is true, then the future cannot be a ”al...
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