Does there exist a parallel universe?
Is there a possibility that all this what we have is nothing but a dream?
This world, this earth...
countries...
religions...
everything?
How much do you know about the fact that an electron can disintegrate at one place and reintegrate on another place, wave –particle theory?, In other words an electron can be in “existence” and “nonexistence” state at the same time.
An electron is one of the building blocks of the matter; if it can stay simultaneously in a state of parallel existence and non existence then why can’t the universe stay in a parallel state.
To get an answer for your second question, you probably have to be clear about your belief about reality, whether reality is subjective and plausible only if you can “observe” it or objective and exists whether or not you have power and opportunity to witness it. This is a pure philosophical debate that has grappled the minds of both scientists and philosophers for centuries.
What if you are analyzing scientifically the existence of the world and somehow come to a conclusion based on the experiments that universe does not exist, where you would put yourself in the backdrop of your analysis. Can your really separate what is observed from who is observing it