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We have studied collective spin density excitations of fractional quantumHall effect (FQHE) in rotating Bose-Einstein condensation for the three fillingfractions of first series of Jain's composite fermion sequences. We haveconsidered, short-ranged contact interactions between the Bose atoms as well aslong range Coulomb interactions to compare the nature of the spectras with FQHEof electrons. Using Monte Carlo method for finite but large number ofparticles, the lowest order collective modes of spin-reversed sectors iscalculated here, by computing the energy differences of the respective excitonsfrom the fully polarized ground states.

Collective spin density excitations of fractional quantum Hall states in dilute ultracold Bose atoms