The SARAS 3 Non-Detection as a Bound on Early X-ray Heating in the Bounce Frame

Where EDGES reported a deep feature, the SARAS 3 experiment reported no such feature and rejected the EDGES best-fitting profile at stated confidence. Using the stated cosmology and the brightness-temperature relations described in the Methods, the calculation gives the following headline values: max heat frac = 0.59; depth at bound mK = -150; unheated depth mK = -260. 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.