(Starblade Darksquall) wrote in message . com...
(György Szondy) wrote in message . com...
(Starblade Darksquall) wrote in message . com...
How can the gravitational field have an energy? Isn't energy what
CREATES the gravitational field? Also, why is it that this energy does
not create any curvature effects while all other energies do? Doesn't
this violate the equivilence between all types of energies?

Where does the energy come from if free fall doesn't create any
energy? Do they mean the energy created when one accelerates up in a
gravitational field? If so, then why don't they just say so? And,
furthermore, this WOULD have an effect on its energy, at least from a
free-fall frame of reference, so why not include it in its
calculations?

This doesn't make any sense to me at all. And I'm not stupid or
anything. I don't see why they found it necessary to do these things.
Maybe either I need to be educated more, or their theory needs some
tweaking.

(...Starblade Riven Darksquall...)

Gravitational field has no energy - if you change the definitions (see
Brans and Dicke). In that case the theory will be linear (see
http://www.arxiv.org/html/physics/0109038).

What exactly is meant when they say that the gravitational field does
or does not have energy?
It means:
1.) gravitational field does not have energy means: Energy causes
gravity
2.) gravitational field does have energy means: Energy and Gravity
causes Gravity.

To solve the second case it is obvious that the equation must be
changed so that Energy remains on one side and Gravity is arranged to
be only on the other side. (Separate them) The result is equation 1.)
So then why do not we start with equation 1.)?


Also, what about this article:

http://www.npl.washington.edu/AV/altvw100.html

What's wrong with having a gravitational stress energy tensor?
Especially if the energy in the gravitational field itself causes
curvature.
Nothing is wrong, except that in case of multi objects the result is
an unsolvable nonlineal equation.


(...Starblade Riven Darksquall...)