# Questions tagged [spacetime]

As a consequence of the Lorentz transformations, time and space transform into each other when changing reference frame. This calls for a unified description: Minkowski spacetime.

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### Is time relative because of the difference in distance traveled by the light inside the light clock [closed]

Are space and time then directly connected? Can someone just explain to me how the math translates this intuition or correct my intuition of the concept through the same thought experiment with the ...
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### Find an example of a closed, achronal set $S$ in Minkowski spacetime such that $J^+(S)$ is not closed

This is one of the exercises on Wald's General Relativity: Chapter 8, Problem 8.b Find an example of a closed, achronal set $S$ in Minkowski spacetime such that $J^+(S)$ is not closed. (Hint: ...
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### Expressing curvature invariants ($K_1, I_1, ...$), at any one event, through Synge's WF $\sigma$ (given of each event pair, in a suitable region)

Considering a set $\mathcal S$ of events such that for each pair $p, q \in \mathcal S$ Synge's world function $\sigma$ is defined and the corresponding value $\sigma[ ~ p, q ~ ]$ is given, and such ...
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### Another dimensions [closed]

Just a science ponderer, and pretty much interested in physics. Please guide me if I am wrong. There have been many statements made by the physicists about the existence of other dimensions (...
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### Geometrically Impossible Spacetime

A result in math says that $S^n$ carries a Lorentzian metric iff $n$ is odd. Using it we can observe that a 2-sphere spacetime is impossible, a 3-sphere spacetime is geometrically possible, but again ...
1 vote
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