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By P. F. Hsieh, A. W. J. Stoddart

ISBN-10: 3540053697

ISBN-13: 9783540053699

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6 Appendix: A distributional lemma For a function Ψ : Rm → R we define δΨ = δΨ=0 by δΨ=0 , ϕ = lim →0 ρ (Ψ(y))ϕ(y) dy ∀ϕ ∈ Cc (Rm ) (3) Rm where (ρ ) is any approximation of the 1-dimensional Dirac measure at the origin. 1 For any a, b ∈ R, a = 0 δa x−b = 1 δx=b/a . a (4) For a = b, δ(x−a)(x−b) = 1 (δx−a + δx−a ). 2 As two particular cases we obtain 1 δx=a , 2a 1 = δx=a .

10) where D1 (F ) and Dτ (f ) are the usual dissipation entropy production of one specie, and D1,2 (F, f ) is the mixed dissipation entropy production given by D1,2 (F, f ) := R12 w1,2 δC1,2 j F f∗ (1 + F )(1 + τ f∗ ), F∗ (1 + F )(1 + τ f∗ ) dpdp∗ dp dp∗ . 2). 1. 12) (F (p)E1(p) + f (p)E2 (p)) dp = E. 12) HS (G, g), with HS (G, g) = HBE (G) + Hτ (g). 13) We believe that a complete analysis of this problem can be done using the same ideas exposed in the Section 2 and used in [24]. 2. 2). Of course the situation here is the same as for the Boltzmann Bose equation.

52). Nevertheless, in each of these cases, the functions b(ε, ε ) which appear in the collision have different, although similar, behaviour in the domain ε > 0, ε > 0. 3) imposed in the existence theorems obtained in [23]. The global existence of solutions in L1 is then still an open question for this equation. 4 The Kompaneets equation In this subsection we present the deduction of the Kompaneets equation from the Boltzmann-Compton equation, and we mainly follow [33] and [35, Vol. 3]. The Kompaneets limit is valid for ε, ε mc2 .

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