Can you help me with the following: Prove that a geometric Brownian motion can be represented as a time-changed Bessel process $ \exp(B_t+vt)=R_{A_t} $ where $A_t= \int_{0}^t \exp(2(B_s+vs)) ds$ and $(R_t)$ is a Bessel process of parameter $2v+1$.
Brownian motion and Bessel process
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stochastic-processes
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3And still no reaction [here](http://math.stackexchange.com/q/97484/6179)? – 2012-01-16