A recent experiment performed in a 51-Rydberg atoms chain with nearest neighbours strong interactions (blockade regime), observed long-lived oscillations in the expectation value of local observables quenching from a Neel-ordered initial state. This fact seems to violate the common belief according to which the initial state should rapidly thermalize. In this talk I will present a new approach to tackle this problem, connecting it to epitome phenomena in high-energy physics. In particular, I will show how the Hamiltonian describing the atom chain can be exactly mapped to a U(1) lattice gauge theory, namely S=1/2-QLM. This fact enables us to interpret the observed long-lived oscillations as slow string dynamics and, furthermore, shows the possibility of performing large scale quantum simulations in lattice gauge theories with the state-of-the-art technology.