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Results tagged with spacetime
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user 136463
Within relativity (both special and general), changes of reference frames can change both the notions of space and of time, with one depending on the other as well. As a consequence, it is necessary to treat both concepts in a unified manner. Hence the term spacetime.
2
votes
Falling toward a black hole
This is a simplified answer that makes one approximation (distant initial point) to get nicer formulas and clarify the big picture of the calculation. To see the precise final formulas (without approx …
- 4,733
0
votes
In spacetime, how do we interpret the "4th dimension"?
The trajectory-dependent time, the one that an observer followong a given trajecrory measures, is called the proper time. The time coordinate of $\mathbb{R}^4$ is not an absolute time, but just the pr …
- 4,733
3
votes
How can we be certain our world has only three spatial dimensions?
I'm not sure what kind of argument can convince you, since you seem to reject the everyday experience that the world has three dimensions. Nevertheless, I'll try to give an alternative argument of why …
- 4,733
3
votes
Accepted
Is everything relative? Length and time?
Let's try to understand first the setting we are in. The sentence:
the fact that the speed of light is a universal constant and has not changed
seems to imply that the laws of physics and the un …
- 4,733