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On the microscopic propagation speed of long-range quantum many-body systems
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We consider the time-dependent Schr\"odinger equation that is generated on the bosonic Fock space by a long-range quantum many-body Hamiltonian. We derive the first bound on the maximal speed of particle transport in these systems that is thermodynamically stable and holds all the way down to microscopic length scales. For this, we develop a novel multiscale rendition of the ASTLO (adiabatic spacetime localization observables) method. Our result opens the door to deriving the first thermodynamically stable Lieb-Robinson bounds on general local operators for these long-range interacting bosonic systems.
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Local enhancement of the mean-field approximation for bosons
For bosons on a lattice, the mean-field approximation error far from the initial condensate is bounded by any inverse power of the distance for times up to a distance-dependent light cone.
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