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Time Travel and Modern Physics (12645 words) |
 | That is to say, they have made it very plausible that, in the billiard ball wormhole case, the time travel structure of such a wormhole space-time does not result in constraints on states on spacelike surfaces in the non-time travel region. |
| But one might still expect that there should be no constraints on states on a spacelike surface, provided one keeps the surface ‘small enough’. |
| Thus the reason why the global time travel properties of the counterfactual space-time have to be significantly different from the actual space-time is not that there are problems with metric singularities or alterations in the metric that force significant global changes when we go to the counterfactual matter distribution. |
| Determinism in Reformed Theology, Calvinism (9134 words) |
| Einsteinian diagrams of spacetime as a 4-dimensional reference frame were described in the early 1900s, as was much of James' writing. |
| Perhaps the idea of a 4-dimensional block universe (time as a spacelike dimension) was widespread in the late 1800s. |
| James decided his first freewill act would be to believe in metaphysically free will -- in opposition to his father's "iron block universe Calvinism". |
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