Suppose the Universe is shaped like a sprial galaxy. Now suppose that the Universe is spinning as would a sprial galaxy. The centrifugal force would create a gravity field that would assist as "glue", but not enough. In order for the entire Universe to exert the kind if force needed to keep all matter in place it would collapse in upon itself. Therefore the gravitational force exerted would be weak, and the centrifugal force would be minimal. To supplement that force each rotating galaxy would create its own gravitational waves alone spacetime. In turn the neutrino equotient present would also create a gravitational force. I believe it possible that these gravitational forces combined may be equate to the force that is dark energy.
Since Einstein proved that a person in an enclosed elevator accelerating upward in a vacuum would be unable to differentiate between gravity or acceleration the same principle would apply to the spin of the Universe. We (all people on Earth) are in the enclosed elevator or in this case the enclosed Universe. On a scale the size of the Universe we do not have a window to observe the rotation. We can "detect" the rotation by its action on other matter; namly gravity.
Since Einstein proved that a person in an enclosed elevator accelerating upward in a vacuum would be unable to differentiate between gravity or acceleration the same principle would apply to the spin of the Universe. We (all people on Earth) are in the enclosed elevator or in this case the enclosed Universe. On a scale the size of the Universe we do not have a window to observe the rotation. We can "detect" the rotation by its action on other matter; namly gravity.
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