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I understand the general concept of a lorentz transformation and a lorentz boost. What does it mean for a lorentz boost to be large however?

My current guess is that this is referring to a large difference in velocity between the frames of reference, is this accurate?

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    $\begingroup$ Yes, That’s right. $\endgroup$ – Prahar Aug 6 '18 at 2:04
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    $\begingroup$ Large can mean two things depending on the context: (1) $\gamma-1$ is not negligible compared to $1$ (as answered below) or (2) $\gamma \gg 1$. $\endgroup$ – safesphere Aug 6 '18 at 4:42
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How large is "large"? It depends on the context. Typically, a large Lorentz boost is one that produces relativistic deviations from what Newtonian mechanics predicts that are too large to be ignored.

Note that for $v=0.1c$, the Lorentz factor $\gamma \approx 1.005$, which is negligible for many purposes, so a large Lorentz boost needs to be larger than that.

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