... following

In a inhomogeneous system, similarly way to what happens in a homogeneous system, ${\vec f}$ depends on ${\vec v}$, ${\vec F}$ and $\theta$ (the angle between ${\vec v}$ and ${\vec F}$) while unlike homogeneous systems, ${\vec f}$ is a function of the inhomogeneity parameter p. The dependence of ${\vec f}$ on p is not only due to the functions A(p), B(p) and to the density parameter $\alpha$ but also to the parameter $\beta=\vert\vec F\vert/{\vec Q}_{\it H}$. In fact in inhomogeneous systems the normal field  ${\vec Q}_{\it H}$ is given by ${\vec Q}_{\it H}=GM(\alpha B(p)/2)^{2/(3-p)}$, clearly dependent on p.

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... =0.15

This is the value I used, remember however that the distribution is scale-free.

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