6 research outputs found
Coalescent tree based functional representations for some Feynman-Kac particle models
We design a theoretic tree-based functional representation of a class of
Feynman-Kac particle distributions, including an extension of the Wick product
formula to interacting particle systems. These weak expansions rely on an
original combinatorial, and permutation group analysis of a special class of
forests. They provide refined non asymptotic propagation of chaos type
properties, as well as sharp \LL\_p-mean error bounds, and laws of large
numbers for -statistics. Applications to particle interpretations of the top
eigenvalues, and the ground states of Schr\"{o}dinger semigroups are also
discussed
On the quantization of polygon spaces
Moduli spaces of polygons have been studied since the nineties for their
topological and symplectic properties. Under generic assumptions, these are
symplectic manifolds with natural global action-angle coordinates. This paper
is concerned with the quantization of these manifolds and of their action
coordinates. Applying the geometric quantization procedure, one is lead to
consider invariant subspaces of a tensor product of irreducible representations
of SU(2). These quantum spaces admit natural sets of commuting observables. We
prove that these operators form a semi-classical integrable system, in the
sense that they are Toeplitz operators with principal symbol the square of the
action coordinates. As a consequence, the quantum spaces admit bases whose
vectors concentrate on the Lagrangian submanifolds of constant action. The
coefficients of the change of basis matrices can be estimated in terms of
geometric quantities. We recover this way the already known asymptotics of the
classical 6j-symbols
International Navigation Market
Economic record of human society in the last period has involved an unprecedented growth of world trade, trafficking of basic raw materials needed for industry and agriculture, and trade in industrial products or food. To the huge volume of movement of goods, shipping takes back the role of first order both quantitatively as well as efficiency. This situation is encouraged by factors
such as diversification of trade, number of participants in this process and the increasingly complex international trade
International Navigation Market
Economic record of human society in the last period has involved an unprecedented growth of world trade, trafficking of basic raw materials needed for industry and agriculture, and trade in industrial products or food. To the huge volume of movement of goods, shipping takes back the role of first order both quantitatively as well as efficiency. This situation is encouraged by factors
such as diversification of trade, number of participants in this process and the increasingly complex international trade