“is currently trying to replicate the Big Bang”
i sure hope not!
what they are trying to do however is look into conditions that probably existed very shortly AFTER the big bang.
also to find the Higgs Boson, an extremely important particle (and field) which is believed to exist but has never been “seen” it is also referred to as the “G-d particle” as it is presumed to give substance to all other existing particles.