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Astronomy and Cosmology
Cosmology
Mass of Space (B but approaching I)
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[QUOTE="PeterDonis, post: 6855127, member: 197831"] I don't think this is correct. "Space expanding" is not the cause of anything. It's a coordinate-dependent description of the spacetime geometry. The objects in question are following geodesics so they feel no force, so nothing is "moving them apart". In terms of spacetime geometry and invariants, what is often referred to as "space expanding" is best described as the congruence of "comoving" worldlines having a positive expansion scalar. But that is a property of the congruence of worldlines, not of "space". Yes, but as you note, this is a coordinate-dependent description. As I said earlier, there is no invariant that says "there is more vacuum energy over time". And physics is supposed to be contained in invariants, not coordinate-dependent quantities. [/QUOTE]
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Astronomy and Cosmology
Cosmology
Mass of Space (B but approaching I)
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