  An explicit Wigner formulation of Minkowski particle states for non-inertial
observers is unknown. Here, we derive a general prescription to compute the
characteristic function for Minkowski-Fock states in accelerated frames. For
the special case of single-particle and two-particle states, this method
enables to derive mean values of particle numbers and correlation function in
the momentum space, and the way they are affected by the acceleration of the
observer. We show an indistinguishability between Minkowski single-particle and
two-particle states in terms of Rindler particle distribution that can be
regarded as a way for the observer to detect any acceleration of the frame. We
find that for two-particle states the observer is also able to detect
acceleration by measuring the correlation between Rindler particles with
different momenta.
