  Enhanced experimental capabilities to control nonlocal and power-law decaying
interactions are currently fuelling intense research in the domain of quantum
many-body physics. Compared to their counterparts with short-ranged
interactions, long-range interacting systems display novel physics, such as
nonlinear light cones for the propagation of information or inequivalent
thermodynamic ensembles. In this work, we consider generic long-range open
quantum systems in arbitrary dimensions and focus on the so-called strong
long-range regime. We prove that in the thermodynamic limit local properties,
captured by reduced quantum states, are described by an emergent
non-interacting theory. Here, the dynamics factorizes and the individual
constituents of the system evolve independently such that no correlations are
generated over time. In this sense, long-range interacting systems are locally
non-interacting. This has significant implications for their relaxation
behavior, for instance in relation to the emergence of long-lived
quasi-stationary states or to the absence of thermalization.
