# Some Doubts on Perturbation theory

eljose79
Here they go my doubts:

a)Could It be that a theroy that is not renormalizable in three or four dimension could it be renormalizaed in two?..i mean if depending on the dimension a theory is renormalizable or not....when it comes to gravity..in which dimension is renormalizable?.

b)When you have HF=dF/dt where this would be the functional schroedinguer equation with functional derivatives then if we have H=H0+Hint then if we use perturbation theory to calculate F (The functional wave)..my question if that this perturbation scheme is realted to the covariant perturbation theory.