a(t) = 1/(1+z)Key Physics:Scale factor relation: 1 + z = 1/a, so a(t) = 1/(1+z)Scale factor is set to 1.0 at present time, smaller values in the pastSize at any time = scale factor × current size1 MWD = 100,000 light-yearsCalculations based on Planck 2018 cosmological parameters via astropy.cosmology (current universe age ≈13.79 billion years; observable diameter ≈93 billion light-years)Post-inflation size corrected based on standard inflationary models (assuming ≈60 e-folds of expansion), yielding a physical diameter for the observable universe of ≈0.88 mm (≈0.035 inches), close to the size of a grain of sand.Does this sound correct?https://astronuclphysics.info/Gravitace5-5.htmhttps://physics.stackexchange.com/questions/32917/size-of-universe-after-inflationphysicsforums.com/threads/big-bang-size-of-the-universe-at-different-epochs.1010248/
>>16776718Why do physicists refuse to define anything, and just expect you to somehow telepathically know what they're talking about and what each variable refers to?
>>16776734Table shows the universe's observable diameter every billion years since post-inflation, based on standard scale factor physics (a(t) = 1/(1+z))Columns: age (billion years) diameter (billion light-years), Milky Way Diameters (MWDs, where 1 MWD = 100,000 light-years) redshift (z), scale factor (a) % increase from the prior increment. Small post-inflation size (~0.035 inches) reflects early expansion, growing to 93 billion light-years today. these variables are used to model expansion; z measures how light stretches, and a scales the size. It's intoned to be a concise way to display the universe’s growth
adjusting the baseline to where universe is 10 inches in diameter at 1.0 billion years ago we get the following: The % increases remain consistent with the original physics, adjusted for the new baseline.This analogy simplifies the vast scale (93 billion light-years) into a manageable 10-inch diameter at 1.0 billion years, growing to ~66.5 inches (or ~5.5 feet) today, which is more intuitive for visualization.
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