Thermal-Hall conductivity and long-lived quasiparticles in CeCoIn${}_5$

In CeCoIn${}_5$, the thermal conductivity ${\kappa }_{xx}$ and Hall conductivity ${\kappa }_{xy}$ below $T_c$ display large anomalies below $T_c$. The strong suppression of the anomalies in weak fields implies the existence of long-lived quasiparticles. We also discuss briefly the Wiedemann-Franz ratio and the existence of a strongly field-dependent spin-fluctuation heat current.