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Uniqueness of the self-similar profile for a kinetic annihilation model

We show the existence of a self-similar solution for a We prove the uniqueness of the self-similar profile solution for a modified Boltzmann equation describing probabilistic ballistic annihilation. Such a model describes a system of hard spheres such that, whenever two particles meet, they either annihilate with probability $α\in (0,1)$ or they undergo an elastic collision with probability $1-α$. The existence of a self-similar profile for $α$ smaller than an explicit threshold value $\underlineα_1$ has been obtained in our previous contribution (J. Differential Equations, 254, 3023--3080, 2013). . We complement here our analysis of such a model by showing that, for some $α^{\sharp} $ explicit, the self-similar profile is unique for $α\in (0,α^{\sharp})$.