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Astronomy and Cosmology
Cosmology
Infinite space in a finite bubble, in a Tegmark Level 2 multiverse?
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[QUOTE="DanielJ2021, post: 6517277, member: 692590"] [B]TL;DR Summary:[/B] If our universe (in entirety, including all that lies beyond our observable universe), is spacially infinite[1], how can it exist alongside other infinitely large, and completely separate, universes in a Tegmark Lvl.2 multiverse (eternal inflation)? [1]All evidence points to the universe being infinitely large, or so large that any curvature is potentially impossible to measure So I am a layman in physics, I admit I am trying to grasp big ideas piecemeal via articles, wikipedia and YouTube. I don't pretend to be educated in this regard but I am curious and willing to learn! The idea of the multiverse intrigues me. Sidestepping for a second the fact that the idea has been dismissed as basically religion for the fact that it is untestable for the time being, I just want to grasp the arguments around it. Specifically for this thread my question is...in Tegmark's hierarchy of the multiverse, Level 2 represents the idea of eternal inflation breeding a multiverse. In this scenario a universe like ours might spawn randomly alongside an infinite number of others, each with different laws of physics. A universe like ours, and potentially all the rest, would be infinite in size. However, how can multiple infinitely-large universes co-exist in the multiverse? Where do they all fit? Tegmark himself gives a clue but I would like clarity on this and up to date insight; [I]Surprisingly, it has been shown that inflation can produce an infinite Level I multiverse even in a bubble of finite spatial volume, thanks to an effect whereby the spatial directions of spacetime curve towards the (infinite) time direction (Bucher & Spergel 1999)[/I]. (source attached) Can someone talk me through this please? Thank you! [/QUOTE]
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Astronomy and Cosmology
Cosmology
Infinite space in a finite bubble, in a Tegmark Level 2 multiverse?
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