The discussion centers on the concept of angular momentum, suggesting that the angular momentum of a mass M could be equivalent to that of the universe's background rotating in the opposite direction. The idea posits that this background rotation is unobservable, leading to questions about its implications. Participants debate the nature of observability, arguing that if something is unobservable, it lacks observable implications, yet indirect evidence could still suggest its existence. The conversation also touches on the idea that rotation does not require a reference frame to gauge, challenging the notion of relativity in this context. The thread concludes with a request for peer-reviewed references to further explore this scenario.
