Sean Carroll's Mindscape: Science, Society, Philosophy, Culture, Arts, and Ideas
AMA | September 2024
Sean Carroll
Because in the context of ordinary relativity theory as we know it, particles either move slower than the speed of light or at the speed of light. You can imagine new kinds of particles, new kinds of substances, tachyons, that only move faster than the speed of light, okay? We have zero evidence that those things exist in the real world, but you can imagine them.
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