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XIII: 48, 557-569, LNM 721 (1979)

**CARMONA, René**

Processus de diffusion gouverné par la forme de Dirichlet de l'opérateur de Schrödinger (Diffusion theory)

Standard conditions on the potential $V$ imply that the Schrödinger operator $-(1/2)ėlta+V$ (when suitably interpreted) is essentially self-adjoint on $L^2(**R**^n,dx)$. Assume it has a ground state $\psi$. Then transferring everything on the Hilbert space $L^2(\mu)$ where $\mu$ has the density $\psi^2$ the operator becomes formally $Df=(-1/2)ėlta f + \nabla h.\nabla f$ where $h=-log\psi$. A problem which has aroused some excitement ( due in part to Nelson's ``stochastic mechanics'') was to construct true diffusions governed by this generator, whose meaning is not even clearly defined unless $\psi$ satisfies regularity conditions, unnatural in this problem. Here a reasonable positive answer is given

Comment: This problem, though difficult, is but the simplest case in Nelson's theory. In this seminar, see 1901, 1902, 2019. Seemingly definitive results on this subject are due to E.~Carlen,*Comm. Math. Phys.*, **94**, 1984. A recent reference is Aebi, *Schrödinger Diffusion Processes,* Birkhäuser 1995

Keywords: Nelson's stochastic mechanics, Schrödinger operators

Nature: Original

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XIII: 49, 570-573, LNM 721 (1979)

**CARMONA, René**

Opérateur de Schrödinger à résolvante compacte (Miscellanea)

A sufficient condition for a Schrödinger operator $(-1/2)ėlta+V$ to have a compact resolvent is proved, using standard properties of Brownian paths

Keywords: Schrödinger operators

Nature: Original

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Processus de diffusion gouverné par la forme de Dirichlet de l'opérateur de Schrödinger (Diffusion theory)

Standard conditions on the potential $V$ imply that the Schrödinger operator $-(1/2)ėlta+V$ (when suitably interpreted) is essentially self-adjoint on $L^2(

Comment: This problem, though difficult, is but the simplest case in Nelson's theory. In this seminar, see 1901, 1902, 2019. Seemingly definitive results on this subject are due to E.~Carlen,

Keywords: Nelson's stochastic mechanics, Schrödinger operators

Nature: Original

Retrieve article from Numdam

XIII: 49, 570-573, LNM 721 (1979)

Opérateur de Schrödinger à résolvante compacte (Miscellanea)

A sufficient condition for a Schrödinger operator $(-1/2)ėlta+V$ to have a compact resolvent is proved, using standard properties of Brownian paths

Keywords: Schrödinger operators

Nature: Original

Retrieve article from Numdam