  Studying of the relativistic three-body bound state in a three-dimensional
(3D) approach is a necessary first step in a process to eventually perform
scattering calculations at GeV energies, where partial-wave expansions are not
useful. To this aim we recently studied relativistic effects in the binding
energy and for the first time, obtained the relativistic 3B wave function
\cite{Hadizadeh_PRC90}. The relativistic Faddeev integral equations for the
bound state are formulated in terms of momentum vectors, and relativistic
invariance is incorporated within the framework of Poincar\'e invariant quantum
mechanics.
