Abstract
Spectral properties of the Boltzmann operator linearized around a local Maxwellian have been investigated. We show that the spectrum is the same in all spaces LP, 1 ⩽ p ⩽ ∞, It consists of a half-plane Re λ ⩽ v 0 and a countably many eigenvalues in a strip -v 0 < Re λ ⩽ 0. We analyse eigenvalues with Re λ = 0 and show that when linearization is performed around a space nonhomogeneous Maxwellian all eigenvalues lie in the open strip -λ0 < Re λ < 0. For a space homogeneous Maxwellian the fivefold degenerate eigenvalue λ = 0 is the only one with Re λ = 0.

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