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In the next subsections, we'll derive the dependence of this decay timescale on $1/T^2$, where $T$ is the temperature of the Fermi Liquid, assumed small on the scale of the Fermi temperature $T_F$.         \subsection{Intrinsic quasiparticle decay}  Gives $T^2$ resistivity. From the assumptions of the Fermi Liquid theory, we have a well defined Fermi surface in $\mathbf{k}$--space, with well defined crystal momentum $\hbar \mathbf{k}_F$  \subsection{Quasiparticle--impurity scattering}  Gives constant resistivity (dominates).