Is There Any Spacetime Outside Our Universe

Abstract

In this essay, I discuss whether there is any spacetime outside our universe. If one claims that there is, then the question is: Which energy would justify the existence of that spacetime? This is because the universe as a whole does not have any energy. So this universe cannot justify the existence of any spacetime outside it, because without energy there cannot be any spacetime. As the total energy of the universe has always remained zero, so it is very much doubtful as to whether there was any spacetime outside our universe at any time.