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0 pointsJoeOfTexas1y ago0 comments

If expansion at the big bang started with a rate of X. Could the varying densities at different points cause their expansion to deviate from the original rate?

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mr_mitm1y ago

I'm not sure what exactly you mean, but the Hubble tension could also be explained if we live in a particularly large under dense region of the universe. Then the light we observe from the CMB basically has to climb out of a gravitational well which would influence our measurement. IIRC such a substantial under density is considered unlikely though and very hard if not impossible to measure.

The spatial inhomogeneities of matter in the very early universe, which I believe you might be talking about, were extremely tiny.

digging1y ago

> I'm not sure what exactly you mean, but the Hubble tension could also be explained if we live in a particularly large under dense region of the universe.

That would be the proposed Local Hole.

[1]https://en.wikipedia.org/wiki/KBC_Void

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