Functionals of Exponential Brownian Motion and Divided Differences

Details Functionals of Exponential Brownian Motion and Divided Differences Functionals of Exponential Brownian Motion and Divided Differences

2010-06-10

arxiv.org/abs/1006.1996v1

Mathematics

Numerical Analysis

Scientific paper

We provide a surprising new application of classical approximation theory to a fundamental asset-pricing model of mathematical finance. Specifically, we calculate an analytic value for the correlation coefficient between exponential Brownian motion and its time average, and we find the use of divided differences greatly elucidates formulae, providing a path to several new results. As applications, we find that this correlation coefficient is always at least $1/\sqrt{2}$ and, via the Hermite--Genocchi integral relation, demonstrate that all moments of the time average are certain divided differences of the exponential function. We also prove that these moments agree with the somewhat more complex formulae obtained by Oshanin and Yor.

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