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It may exist but how would you know?
It isn't as simple as the tree in the forest or the bully in the school yard...
Alternate universes, which may or may not exist, concurent with or prior to our own universe, could very well have entirely different values for their physics. Would they exist as we understand existance?
QM aside, without observation there is no way to be absolutely certain something exists... of course you must remember that there is more than just seeing something. You can witness the effects of something other objects and postulate its existance...
Dark matter is an example of this... it exists in theory because of what we see happening around it... we don't know for certain that it exists.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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