Rotation would imply a preferred axis and differential accelerations not accounted in GR or other theories.
What methods tell whether or not there is rotation.
Most observable things rotate.
Is The Universe Rotating? How Do We Know?
Time is always rotating this is evident from from day night and year period
Similarly a big time event is there around unknown Axis which can be explained by intuition that means something happened previously is getting in memory of human mind
And secondly stories of destruction and coming of good periods in every religion
There's an article on the topic here:
https://phys.org/news/2016-09-scientists-universe.html
The paper is available through arXiv link at the bottom.
How do you define rotation of "everything"? Rotation needs a reference to be meaningful, but I don't think you can have a reference outside the universe. Can you?
VM: How do you define rotation of "everything"?
The mean rotation of the universe as a whole relative to a 3-axis gyroscope.
But if the whole universe is rotating, so is the gyroscope along. It would not detect a rotation, because "everything" including itself is rotating.
VM: But if the whole universe is rotating, so is the gyroscope along.
That would be true if Mach's Principle applied but it doesn't seem to.
Mach's principle assumes inertia originates in a kind of interaction between bodies. That is not what I meant, but actually what you mean. If the universe is moving, everything in it will move as well.
Moving, yes but not rotating. If it were spinning on an axis, a gyroscope would not be expected to spin with it. Mach's Principle suggests the reference for rotation is distant matter so it would then follow the rotation of the universe.
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