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17 votes
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How does hyperbolicity of space time affect our lives?

I would suggest John Barrett's essay on The Hyperbolic Theory of Special Relativity as a comprehensive answer. The principle of relativity corresponds to the hypothesis that the kinematic space is …
Carlo Beenakker's user avatar
7 votes
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How are spatial coordinate systems in physics defined?

This question has been explored in the context of global positioning systems, which need to account for general relativity. The traditional Minkowski coordinates $(t,x,y,z)$ of flat space-time do not …
Carlo Beenakker's user avatar