My question is the title itself. ..... Why does a spin O graviton predict that a gas will be less gravitational when it is hot than when it is cold?
I know this contradicts observation, and that a quantum theory of gravity based on General Relativity will have a spin 2 graviton.
My question is about a spin O graviton that you would get by quantizing a scalar theory of gravity, such as Newton's or Nordstrom's.