Resonances of the Kramers-Fokker-Planck Operator

We study the subellipticity of the analytically deformed Kramers-Fokker-Planck operator and give two definitions of resonances, one based on analytic dilation and the other on analytic distortion in the x-variables. Due to the failure of global subellipticity of the distorted operator in dimensions n ≥ 2, the second method can only be used in dimension one. We show that, whenever both methods are applicable, they give rise to the same set of resonances. We also prove that, when | V(x)| = O( x-ρ) with $ρ>1$, positive resonances are embedded eigenvalues and/or scattering resonances whose resonant states belong to weighted L²-spaces and satisfy an outgoing radiation condition.