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• W2023017169 abstract "This paper considers Schrodinger operators, and presents a probabilistic interpretation of the variation (or shape derivative) of the Dirichlet groundstate energy when the associated domain is perturbed. This interpretation relies on the distribution on the boundary of a stopped random process with Feynman-Kac weights. Practical computations require in addition the explicit approximation of the normal derivative of the groundstate on the boundary. We then propose to use this formulation in the case of the so-called fixed node approximation of Fermion groundstates, defined by the bottom eigenelements of the Schrodinger operator of a Fermionic system with Dirichlet conditions on the nodes (the set of zeros) of an initially guessed skew-symmetric function. We show that shape derivatives of the fixed node energy vanishes if and only if either (i) the distribution on the nodes of the stopped random process is symmetric; or (ii) the nodes are exactly the zeros of a skew-symmetric eigenfunction of the operator. We propose an approximation of the shape derivative of the fixed node energy that can be computed with a Monte-Carlo algorithm, which can be referred to as Nodal Monte-Carlo (NMC). The latter approximation of the shape derivative also vanishes if and only if either (i) or (ii) holds." @default.
• W2023017169 created "2016-06-24" @default.
• W2023017169 creator A5033331209 @default.
• W2023017169 date "2010-08-26" @default.
• W2023017169 modified "2023-10-14" @default.
• W2023017169 title "On a probabilistic interpretation of shape derivatives of Dirichlet groundstates with application to Fermion nodes" @default.
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• W2023017169 doi "https://doi.org/10.1051/m2an/2010049" @default.
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