Strong semiclassical approximation of Wigner functions for the Hartree dynamics

Agissilaos Athanassoulis, Thierry Paul, Federica Pezzotti, Mario Pulvirenti

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

We consider the Wigner equation corresponding to a nonlinear Schrödinger evolution of the Hartree type in the semiclassical limit h → 0. Under appropriate assumptions on the initial data and the interaction potential, we show that the Wigner function is close in L 2 to its weak limit, the solution of the corresponding Vlasov equation. The strong approximation allows the construction of semiclassical operator-valued observables, approximating their quantum counterparts in Hilbert-Schmidt topology. The proof makes use of a pointwise-positivity manipulation, which seems necessary in working with the L 2 norm and the precise form of the nonlinearity. We employ the Husimi function as a pivot between the classical probability density and the Wigner function, which - as it is well known - is not pointwise positive in general.
Original languageEnglish
Pages (from-to)525-552
Number of pages28
JournalRendiconti Lincei Matematica e Applicazioni
Volume22
Issue number4
DOIs
Publication statusPublished - 2011

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