w<-1?

Today, in a seminar, a Prof. asked: in the future, if more and more the data show w=-1 with a little error bar, like today’s data most likely shows but with a bigger error, what that means? Can we rule out all the dynamical model or can still can say any thing about the nature of the DE?

which data we need more ? the data at z~1 or higher z?

“answer”:

it should be z<~1, at different bin