Reionisation Midpoint and Duration under a Bounce-Shifted Star-Formation Onset

Reionisation is often summarised by two numbers, a midpoint and a duration, and different probes constrain different combinations of them. Using the stated cosmology and the brightness-temperature relations described in the Methods, the calculation gives the following headline values: z mid = 7.4; duration dz = 1.8; z mid standard = 7.7; shift = -0.3. The comparison values taken from the published record — including the EDGES and SARAS reports, HERA limits and the Planck optical depth where relevant — are used exactly as published, and the bounce contribution enters only through the named timing, heating or shear inputs. The result is a computed prediction for the delayed-onset history, with its sensitivity to each input stated in the Discussion. This study is simulated and computed from stated assumptions; it is not a measurement.