# Chaotic features of the last scattering in CMB spectrum [CL]

It is shown, using the data obtained by the Planck space telescope (2009-2013), that the angular CMB Doppler spectrum: \$C_l \sim \exp-(l/l_c)\$, with \$l_c \simeq 300\$ in the interval \$370 < l < 2500\$. The waviness observed along the exponential decay has period (distance between peaks) equal to the same \$l_c \simeq 300\$. It means that the waviness is generated by the same, presumably chaotic, mechanism that generates the exponential decay. Comparison with deterministic chaos simulations has been briefly discussed.