From n+1-level atom chains to n-dimensional noises

Details From n+1-level atom chains to n-dimensional noises From n+1-level atom chains to n-dimensional noises

2004-02-04

arxiv.org/abs/math/0402064v1

Mathematics

Probability

22 pages

Scientific paper

In quantum physics, the state space of a countable chain of (n+1)-level atoms becomes, in the continuous field limit, a Fock space with multiplicity n. In a more functional analytic language, the continuous tensor product space over R of copies of the space C^{n+1} is the symmetric Fock space Gamma_s(L^2(R;C^n)). In this article we focus on the probabilistic interpretations of these facts. We show that they correspond to the approximation of the n-dimensional normal martingales by means of obtuse random walks, that is, extremal random walks in R^n whose jumps take exactly n+1 different values. We show that these probabilistic approximations are carried by the convergence of the basic matrix basis a^i_j(p) of $\otimes_N \CC^{n+1}$ to the usual creation, annihilation and gauge processes on the Fock space.

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