Gravitational behavior of antimatter

[Cerveny]

You probably will not be able find out antimatter in the Universe next time, Socratus :) Suppose antimatter gravitationally repulses mutually – so it is scattered in Universe. Gravitational behavior of antimatter is the most weakness of GR :(
Z.

[John]

Antimatter is subject to the same physical laws as normal matter. Gravity applies as normal.

[Thundril]

What John said.

[Cerveny]

Antimatter is subject to the same physical laws as normal matter. Gravity applies as normal.

Nobody has verified it so far :(
The gravitational field is some kind of (elastic) space deformation. Certainly is not difficult to imagine an opposite space's stretching :)

[Thundril]

If a particle, whatever it is made of, is not acted upon, it will continue to move in a straight line with a constant speed. if the space is crved such that a straight line in four-space looks like a curve in three-space, the particle will follow that curve. If all the matter is in big clumps, making big curves in space, and all your-version-antimatter is scattered apart so it doesn't make big clumps, so it doesn't impose its own curves on space-time, then each particle will just follow the curves that matter is creating. Which would still be, exactly what John said

Antimatter is subject to the same physical laws as normal matter. Gravity applies as normal.

[Cerveny]

If a particle, whatever it is made of, is not acted upon, it will continue to move in a straight line with a constant speed. if the space is crved such that a straight line in four-space looks like a curve in three-space, the particle will follow that curve. If all the matter is in big clumps, making big curves in space, and all your-version-antimatter is scattered apart so it doesn't make big clumps, so it doesn't impose its own curves on space-time, then each particle will just follow the curves that matter is creating. Which would still be, exactly what John said

It is nice you are so convinced. I would be too in case the GR does not predicate any singularities, explains "dark matter problem" and allows to be quantized. In case the GR does not exactly predict all the future, in case the some one is able to explain how difference is between less and more "expanded" space, in case some one explains where information is coming from, in case ... We are hopelessly quantizing the Einstein's gravity for eighty years, we certainly need a new physics...

[Thundril]

. We are hopelessly quantizing the Einstein's gravity for eighty years, we certainly need a new physics...

Yes physics has been srtuggling to unify Einstein's picture of gravity with quantum mechanics. And yes we 'need a new physics' in the sense that we need to keep trying to solve this puzzle; at which point we will have a new physics. I suspect some theories are closing in on it as we speak.
M theory looks promising.