The Crossing–Spin-Temperature Coupling: Amplitude, Sign and Shape of the ISO Dark-Ages Feature
The dark-ages programme companion paper derived the coordinate of ISO's 21cm feature with no free parameter (z = 19.5, 69.4 MHz) and left amplitude, sign and width open. This paper computes all three from one mechanism: the resonance crossing transiently opens a thermal channel between baryons and ISO's dark sector (or...