Faster than Light by Robert J. Nemiroff

Author:Robert J. Nemiroff
Language: eng
Format: epub
Publisher: Gatekeeper Press

The best answer is C: c, the speed of light. In special relativity, in order to make time act like a dimension equivalent to length, it must be multiplied by a speed. And the only speed that makes sense is c. This is equivalent to considering that time itself moves at speed c. Then, the space and time dimensions are together called “space-time.”

CHAPTER 23

Superluminal Simultaneity

Have you ever seen two things happen at the same time? Perhaps you saw a coincidence so remarkable that you asked someone nearby, “Did you see that?” That person might put down their slice of pizza and ask, “I’m sorry. Do I know you?” You might be surprised to know that regardless of what type of pizza this person was eating, be it pepperoni, cheese, or even Dijon mustard, if that person was moving with respect to you, they would likely not have considered those two separate events as happening simultaneously, as you did. To them, one event happened first, even if only slightly. In relativity, simultaneity is strange. Explored extensively by Einstein, simultaneity is speed dependent. In this chapter you will get to contemplate just how strange simultaneity is, how it necessarily involves faster-than-light phenomena, and, perhaps as an unexpected bonus, how to know if aliens from Andromeda are attacking.

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