Is a universe without massive particles scale-invariant?
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A general spacetime with no massive particles in it is certainly not conformally (or scale) invariant. For example, the Kerr black hole has no particles at all, and is not scale-invariant.
However, the specific CCC spacetime constructed by Penrose, which he is referring to, is conformally invariant in this case;
However, the specific CCC spacetime constructed by Penrose, which he is referring to, is conformally invariant in this case;
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Hey mate ^_^
In a popular talk by Roger Penrose about spacetime geometry, when introducing his conformal cyclic cosmology starting at 17:15 I think he says that as soon as there are no massive particles left in the universe, the scaling of the spacetime metric loses its meaning, and we are left with a conformal geometry, which is scale invariant.....
#Be Brainly❤️
In a popular talk by Roger Penrose about spacetime geometry, when introducing his conformal cyclic cosmology starting at 17:15 I think he says that as soon as there are no massive particles left in the universe, the scaling of the spacetime metric loses its meaning, and we are left with a conformal geometry, which is scale invariant.....
#Be Brainly❤️
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