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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.

1 vote
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Generalizing the Galilean law of addition of velocities using the Lorentz transformation [closed]

I am reading about how to generalize the Galilean law of addition of velocities using the Lorentz transformation, but I am confused about one step. Here, I have the following equations for Lorentz tra …
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3 votes
1 answer
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How to Understand Negative Energy in the Ergoregion?

I am trying to understand the Penrose process and having trouble explaining negative energy in the ergoregion. How I interpret it is: Energy is the dot product between the four momentum of the object …
Gene's user avatar
  • 63