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This study asks at what redshift the cosmic density last equalled the bounce density, and what that single number implies for every forest observable. Using published Lyman-alpha forest measurements as stated inputs, and a bounce frame in which the early universe turned around at a density of 9.72 x 10^54 grams per cubic centimetre, the relevant quantities are computed directly and compared with the precision of the data. The headline outcome is as follows: z_bounce = 1.5350960704735478e+28; log10_z_bounce = 28.19; frac_at_z5 = 5.9709999999999995e-83; result = negative: bounce density corresponds to redshift ~1e28; all forest observables insensitive. The bounce density corresponds to a redshift of order ten to the twenty-eighth, some twenty-eight orders of magnitude beyond the forest. All values are computed from the stated assumptions, not measured, and the computation is supplied so that every number can be reproduced.
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William Alexander Aldred (2026) studied this question.
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