There is none!
Just as there is no proof for or against the existence of a giant, pink, non-interacting and invisible Elephant that lives in my kitchen who instantly vanishes as soon as anyone enters the room or attempts to prove his existence!
Just as there is no proof for or against the existence of a giant, pink, non-interacting and invisible Elephant that lives in my kitchen who instantly vanishes as soon as anyone enters the room or attempts to prove his existence!