3 ms·

Faster than light was never the problem. Einstein's Theories forbid as fast as light, but say nothing about faster than light travel. Of course, one probably mu

Faster than light was never the problem. Einstein's Theories forbid as fast as light, but say nothing about faster than light travel. Of course, one probably must pass y to get to x. Also, it seems pretty clear that Wolfram does not understand the concept of Warp drive, which is not used to propel the craft, but instead used to warp space to come to the craft, because there is nothing preventing space from traveling faster than light, and, indeed, the expansion of the Universe causes distant galaxies to recede from ours faster than the speed of light. So there you have it, we already have proof of faster than light travel, so we know it is possible. But if FTL travel is not a one way trip, it will tend to introduce causality issues. Say you're somewhere far away and observe some event on Earth that arrived by the speed of light, like maybe a lotto drawing or who wins a game. You could zip back FTL, arrive before the lotto drawing or the result of the game, and bet on those numbers or the game winner. If you were far enough away, you could observe your own birth, and possibly zip back fast enough prevent that from occurring. The Universe may allow FTL travel, but I doubt it will allow such paradox.

alentist 6y ago
> Einstein's Theories forbid as fast as light, but say nothing about faster than light travel. Yes it does. This is a basic consequence of the underlying pseudo-Riemannian geometry. In terms of PDEs, the field value at any point is fully determined by the initial conditions on a Cauchy surface within its past light cone. Quantum mechanically, field operators at spacelike-separated points commute. > Also, it seems pretty clear that Wolfram does not understand the concept of Warp drive, which is not used to propel the craft, but instead used to warp space to come to the craft You didn’t read the article. This is addressed at the end, under “What about warp bubbles and the Alcubierre metric?”.

alentist 6y ago

> Einstein's Theories forbid as fast as light, but say nothing about faster than light travel. Yes it does. This is a basic consequence of the underlying pseudo-Riemannian geometry. In terms of PDEs, the field value at any point is fully determined by the initial conditions on a Cauchy surface within its past light cone. Quantum mechanically, field operators at spacelike-separated points commute. > Also, it seems pretty clear that Wolfram does not understand the concept of Warp drive, which is not used to propel the craft, but instead used to warp space to come to the craft You didn’t read the article. This is addressed at the end, under “What about warp bubbles and the Alcubierre metric?”.