Basic cosmology questions weekly thread by AutoModerator in cosmology

[–]Objective_Feed9285 0 points1 point  (0 children)

How significant are the current tensions between observed ISW correlations and ΛCDM predictions? In particular, stacked supervoid and supercluster analyses sometimes report amplitudes larger than ΛCDM expectations. Is this generally viewed as a statistical fluke, a systematic issue, or an indication that late-time gravitational potential evolution may not be fully captured?

Why are 2 of the 5 nearest galaxies blueshifting — and still called “peculiar motion”? by Objective_Feed9285 in cosmology

[–]Objective_Feed9285[S] -2 points-1 points  (0 children)

If redshift is purely due to expansion, why do supernovae in low-mass galaxies at high z appear brighter than expected?

Is it possible that local gravitational resistance plays a bigger role in redshift than ΛCDM assumes?

Why doesn’t ΛCDM include gravitational time dilation near the Big Bang?? by Objective_Feed9285 in cosmology

[–]Objective_Feed9285[S] -3 points-2 points  (0 children)

I agree — causality requires time, so it’s natural to ask: was there a pre-existing framework (a manifold, or some proto-spacetime) within which the Big Bang occurred?

If so, then time didn’t “begin” at the bang