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## Main Question or Discussion Point

Does relativistic mass curve space-time, i.e., does relativistic mass affect the gravitational field of an object?

- Thread starter redtree
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- #1

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Does relativistic mass curve space-time, i.e., does relativistic mass affect the gravitational field of an object?

- #2

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Do you mean to ask, is the curvature of spacetime greater for relativistic mass, then the rest mass? If so, I would say yes.

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Say, two space ships are traveling in same line and opposite direction with a relative velocity v. Each will observe other's clock to be slow! (though, I'm yet to understand it fully )

So we can not say, what would have really happened, we can only say, what would an observer observe. Do correct me if I have missed something...

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If two observers watching the same event, saw different outcomes to the same experiment, that would be a problem. Usually different observers will see events happening on different time scales, but they must see the same outcome or else there would a contradiction.So we can not say, what would have really happened, we can only say, what would an observer observe. Do correct me if I have missed something...

For instance, the Lorentz transformation 'explains' why different inertial observers always see the same outcome to an EM experiment.

- #6

jtbell

Mentor

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See the following FAQ:Does the additional relativistic mass cause it to collapse into a black hole?

If you go too fast, do you become a black hole?

(hmmm, I see that page has been updated recently. It used to be a lot longer.)

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Well, In the domain of SR, different observers, according to their position, are bound to see different things. For instance, an observer observes a meter stick to be of 1 meter, and the same meter stick is less then 1 meter for an observer with a relative velocity! As about the EM experiment, they won't notice any difference, just because the speed of light is constant, relative to which everything else is measured! And yet, in an experiment concerning the frequency of light, an observer may observe red shift/blue shift, depending on his position.mitesh9:

If two observers watching the same event, saw different outcomes to the same experiment, that would be a problem. Usually different observers will see events happening on different time scales, but they must see the same outcome or else there would a contradiction.

For instance, the Lorentz transformation 'explains' why different inertial observers always see the same outcome to an EM experiment.

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Yes. In fact MTW state that relativistic massDoes relativistic mass curve space-time, i.e., does relativistic mass affect the gravitational field of an object?

Pete

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Relativistic mass, unlike spacetime curvature, is observer dependent.

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Let me ask this question:

If I am moving toward the earth at a speed very close to c, and I wish to calculate the instantaneous force of the earth's gravity on me at any given point in time, do I use the rest mass of the earth, or do I multiply the rest mass of the earth by my Lorentz factor?

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