- #36
PeterDonis
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Buckethead said:So two passing ships is considered a set of global inertial frames?
No. The ships are passing each other, so they are both within the confines of any local inertial frame centered on the event at which they pass. That includes both of their rest frames, and a local Lorentz transformation can be used to transform between them. But none of those frames will extend very far in spacetime, so they're not global. (Unless you are assuming that the two spaceships are alone in the universe, no gravitating masses anywhere.)
Buckethead said:a frame in a gravitational field and one without are two frames that cannot share such a relationship?
That's right; the gravitational field limits the extent of any local inertial frame.