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(General Relativity) Do we have an adjective for time with zero velocity and zero gravity?
If we are just dealing with Special Relativity, we call the time measured by a clock that is stationary (relative to the frame of reference) "coordinate time."
Do we have an adjective to use when we "level up" to General Relativity and now we put a clock at a stationary point and it is extremely far from any source of gravity?
I realize that when we think about it, we realize this isn't possible realistically (removing all gravity would mean removing all mass and that would take us, our planet, our spaceship, etc. out of the system). I'm thinking though we probably have such a "mythical" variable for the purposes of various calculations.
6 Answers
- Anonymous1 decade agoFavorite Answer
Usually it is said to be "locally flat spacetime", such that the Minkowski spacetime of SR is a good approximation over large scales. And "stationary point" is still as meaningless in GR as it was in SR.
I think it is still just called "proper time", since any inertial motion is "zero velocity" in its own frame (and will be seen to be moving by a host of other frames). Removing "gravity" just says that acceleration is zero.
- SharcLv 51 decade ago
There are calculations involving your mythical variable though not in the sense you are expecting it to be. The time as per the general relativity is the itme that has been not affected by gravity of any object near to it. This also means that if there is a massive object near the so called clock in general relativity calculations, then there should be a method to compensate for the gravity equivalent to the objects mass during calculations.
Practically assuming the clock to be far from any object will actually mean that the time is not measurable. So the way to do it is to compensate for this time in a way that the time calculated is independent of the mass or gravity near it.
- Anonymous4 years ago
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- ?Lv 51 decade ago
"At rest, and in an unaccelerated reference frame"
I believe that would be the way to describe an object with zero relative velocity and zero gravity
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- Lola FLv 71 decade ago
We generally still call something like that "coordinate time." I think you know that "stationary point" is relative, of course.
- gintableLv 71 decade ago
We call it an inertial reference frame, should acceleration of it be zero, and should it be in a zero gravity region of space.