BREAKING: New Phase of Matter

You say the laws of physics are the same one century ago, today and in one century but there's something I don't understand, if you do a time translation of an experiment the laws of physics are gonna be different at the instants folllowing the big bang when matter was made of quark-gluon-plasma ? This is no trolling my question is serious. There' s a limit when time translating an experiment in the past direction ?