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R(t) for Observable_Today, Universe for early universe ages
I want to determine the radius vs time for the universe (observable
today) but using universe ages starting with age =3D 0.721 Gyr and moving forward in Gyr increments. Ned Wright's calculator gives values but from our current perspective, looking outward into the surrounding universe, whereas I want to go back in time and am not sure I can use the values. Using the calculator, I got the below values for radius of the universe as a function of the distance out I look using z values to give Gyr increments with default settings for co moving radius: If I did this right, the following are the co moving radii for the universe out to the same co moving radius (that we see today) applied to different ages of the universe starting at 0.721Gyr and increasing by 1Gyr per data point up through present at 13.721Gyr. To the same co moving radius of the universe, the current value is 30.79GLyr, whereas to that same co moving radius at 0.721Gyr age, the co moving radius would have been 14.21GLyr if I did this right. But I used the modern co moving radii, then just multiplied by the ratio of universe age, and am not sure the inversion is correct....ie, that the expansion is (I think the term would be) reversible / self similar?? 14.214956 14.7706565 15.35837267 15.998686 16.7039454 17.48512767 18.36849871 19.37748225 20.56168078 21.9975072 23.83462436 26.39463033 30.79097946 But it's different to look backward from the present, compared to looking forward from the past. ie, if we today were in the universe at age 0.721 Gyrs, would the co moving radius back then have been 14.21Glyr? And today, due to expansion, the co moving radius is now around 30.8Glyrs. Not sure this is a legitimate transformation. rt |
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R(t) for Observable_Today, Universe for early universe ages
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R(t) for Observable_Today, Universe for early universe ages
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