  The role of scalar boson exchange as a mediator of the fermionic dark
particle interaction and the mass of dark particle on the bulk properties of
fermionic dark stars including their moment of inertia and tidal deformability
are studied. We have found that the role of the attractive nature of the scalar
boson exchange and the fermionic dark particle mass can control the stiffness
of the fermionic dark star equation of state. By increasing the strength of
scalar boson coupling, the fermionic dark star becomes more compact. As a
consequence, if scalar boson exchange contribution is included the compactness
of a dark star can exceed $C$=0.22. We also compare the fermionic dark stars
moment of inertia and tidal deformability to those of neutron stars (with and
without hyperons in neutron star core) predicted by relativistic mean field
model. It is evidence that the properties of both types of stars are quite
different. We also have found that the universal I-Love relation in fermionic
dark stars is not affected by scalar boson exchange contribution and the
fermionic dark particle mass. Possible observations of fermionic dark stars are
also discussed.
