  We have studied equipotential surfaces of a thick accretion disk around a
Casadio-Fabbri-Mazzacurati (CFM) compact object in the brane-world scenario,
which owns a mass parameter together with a parameterized post-newtonian (PPN)
parameter. With the increase of the PPN parameter, the size of the thick
accretion disk decreases, but the corresponding Roche lobe size increases.
Thus, the larger PPN parameter yields the larger region of existing bound disk
structures where the fluid is not accreted into the central wormhole. Moreover,
with the increase of the PPN parameter, the position of the Roche lobe
gradually moves away from the central compact object, the thickness of the
region enclosed by the Roche lobe decreases near the compact object, but
increases in the region far from the compact object. Our results also show that
the pressure gradient in the disk decreases with the PPN parameter. These
effects of the PPN parameter on thick accretion disk could help to further
understand compact objects in brane-world scenario.
