Re: rest mass/relativistic mass question

ok, i think i can understand why the black hole will not form with a
continuously linearly accelerating mass. John and Greg's reasoning
seemed particularly elucidating.

Blackbird wrote:
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Ok. It will be easier to answer that question if you tell us why you
think
acceleration should make a difference.
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Correct I should have clarified that at first. That is where the
confusion started. Basically, it seemed to me that as and when I added
mass/energy to any object it contributed to its stress-energy tensor.
You have a static uncharged spehere. You spin it up, it adds to its
stress-energy. You add charges to it, it adds to it stress-energy. In
each case as energy is spent on it some of it is converted into some
form of energy that contributes to the stress-energy tensor and hence
there seems to be no theoritical reason on why that tensor cannot be
made to form a black hole given enough energy is added to it.

Now, with a linearly accelerating mass, energy is definitely being
spent on it. That energy is being transformed into kinetic energy
(which is the other confusing concept because this meaure of energy
seems to be frame dependant) which is as "real" as any other energy
because it can be converted back if necessary to any other form of
energy. However, this kinetic energy for some reason does not
contribute to the stress-energy tensor.

So all kinds of mass-energy do not add to stress-energy tensor? So in
some sort of weird sense energy is not conserved in GR?

.

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