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We have studied the system of hard-core bosons on a 2-D optical lattice usinga variational algorithm based on projected entangled-pair states (PEPS). Wehave investigated the ground state properties of the system as well as theresponses of the system to sudden changes in the parameters. We have comparedour results to mean field results based on a Gutzwiller ansatz.Comment: 9 pages, 9 figure

Variational study of hard-core bosons in a two-dimensional optical lattice using projected entangled pair states