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Current universe (assumed here to be normal matter on the brane) ispressureless from observations. In this case the energy condition is$\rho_0\geq0$ and $p_0=0$. By using this condition, brane models can bedistinguished. Then, assuming arbitrary component of matter in DGP model, weuse four known energy conditions to study the matter on the brane. If there isnonnormal matter or energy (for example dark energy with $w<-1/3$) on thebrane, the universe is accelerated.

Using Energy Conditions to Distinguish Brane Models and Study Brane Matter