  In this paper we explore how to describe a bulk moving particle in the dual
conformal field theories (CFTs). One aspect of this problem is to construct the
dual state of the moving particle. On the other hand one should find the
corresponding operators associated with the particle. The dynamics of the
particle, i.e., the geodesic equation, can be formulated as a Hamiltonian
system with canonical variables. The achievements of our paper are to construct
the dual CFT states and the operators corresponding to the canonical variables.
The expectation values of the operators give the expected solutions of the
geodesic line, and the quantum commutators reduce to the classical Poisson
brackets to leading order in the bulk gravitational coupling. Our work provides
a framework to understand the geodesic equation, that is gravitational
attraction, in the dual CFTs.
