# Law of Exponential Functional

#### gnob

##### New member
Good day!
I have a question regarding the law of the ff:
$$\int_0^t h(s) e^{2\beta(\mu(s) + W_s)}$$
where $\beta >0;$ $h,\mu$ are continuous functions on $\mathbb{R}_+$ with $h\geq 0;$
and $W=\{W_s,s\geq 0\}$ is a standard Brownian motion.

Thanks for any help.

#### chisigma

##### Well-known member
Good day!
I have a question regarding the law of the ff:
$$\int_0^t h(s) e^{2\beta(\mu(s) + W_s)}$$
where $\beta >0;$ $h,\mu$ are continuous functions on $\mathbb{R}_+$ with $h\geq 0;$
and $W=\{W_s,s\geq 0\}$ is a standard Brownian motion.

Thanks for any help.
Please, can You better explain what is the question You have?...

Kind regards

$\chi$ $\sigma$

#### gnob

##### New member
Good day!
I have a question regarding the law of the ff:
$$\int_0^t h(s) e^{2\beta(\mu(s) + W_s)}$$
where $\beta >0;$ $h,\mu$ are continuous functions on $\mathbb{R}_+$ with $h\geq 0;$
and $W=\{W_s,s\geq 0\}$ is a standard Brownian motion.

Thanks for any help.
Many thanks for the reply. What I meant of "law" is the probability density of the given integral. For the case $\mu(s) = -\nu s$ where $\nu$ is a positive constant and $h(s)=1,$ the law was already known (Corollary 1.2, p95) from Mar Yor's book given here Exponential Functionals of Brownian Motion and Related Processes - Marc Yor - Google Books .

Thanks again for any insights.