Questions on Stress-Energy tensor

[Ashwin_Kumar]

I am particularly new to tensors, so, just asking, could some give me the definition of a stress-energy tensor? Also, what would a stress-energy tensor of 0 indicate? Thanks in advance.

[jtbell]

the definition of a stress-energy tensor?

http://en.wikipedia.org/wiki/Stress%E2%80%93energy_tensor