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We have studied the interaction between multiple, competing spatial modesthat are excited by a quantum quench of an antiferromagnetic spinorBose-Einstein condensate. We observed Hanbury Brown-Twiss correlations andassociated super-Poissonian noise in the mode populations. The decay of thesecorrelations was consistent with experimentally observed spin domain patterns.Data were compared with a real-space Bogoliubov theory as well as numericalsolution of the coupled Gross-Pitaevskii equations that were seeded by quantumnoise via the truncated Wigner approximation. The spatial modes that were bothobserved experimentally and deduced theoretically are intimately connected tothe inhomogeneous density profile of the condensate, which imparts many richfeatures to the dynamics.

Hanbury Brown-Twiss correlations and multimode dynamics of quenched spinor Bose-Einstein condensates