# Sunyaev-Zel'dovich effect

11 Jul 2012The thermal Sunyaev-Zelâ€™dovich effect is usuall derived for Compton-interactions of the CMB photons with a thermal gas of electrons - is the assumption of thermality necessary?

bonus: Whatâ€™s happening if the electrons become relativistic?

extra bonus: Can you express \(\mathrm{i}^{+\mathrm{i}}\pm \mathrm{i}^{-\mathrm{i}}\) in terms of trigonometric functions?