Thank you for taking the time to answer. I found it very interesting and informative.
I agree with your statement about the cosmological constant. My point was that Schwarzschild spacetime doesn't represent the universe that we live in.
About matter and antimatter having the same gravitational affects. I agree with this and I didn't imply that opposite curvature of space has opposite gravitational affect.
To me the most interesting part of your answer is "given matter-energy configuration will have a unique energy-momentum tensor associated with it, but the reverse is not true - any given energy-momentum tensor can correspond to more than one possible matter-energy configuration."
I wasn't talking about grand scale universe where planet will appear because of space curvature. I was talking about quantum scale universe where there is limited number of particles that can exist all of which have unique energy-momentum tensor associated with them. I think that we can't have two type of particles with the same energy-momentum tensor, else we are accepting that types of particles are limitless. I think there is a mechanism that limits the type of particles that can exist. On the grander scale I agree that two different object can have the same energy-momentum tensor associated with them, but in this case there are other forces that allow this to happen.
What do you think about idea that there is a border of space curvature where if it's crossed it manifest it's self as a matter, and under that limit as an energy? Is it possible that light exist on that border and that's why it behaves like a wave and like a particle?