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    • Keywords


      Trapped classical gas; dynamical structure factor; Debye–Waller factor.

    • Abstract


      The dynamic structure factor $S(\mathbf{q}, \omega)$ of a harmonically trapped Bose gas has been calculated well above the Bose–Einstein condensation temperature by treating the gas cloud as a canonical ensemble of non-interacting classical particles. The static structure factor is found to vanish $\varpropto q^{2}$ in the long-wavelength limit. We also incorporate a relaxation mechanism phenomenologically by including a stochastic friction force to study $S(\mathbf{q}, \omega).$ A significant temperature dependence of the density fluctuation spectra is found. The Debye–Waller factor has been calculated for the trapped thermal cloud as a function of q and the number $\mathcal{N}$ of atoms. A substantial difference is found for small- and large-$\mathcal{N}$ clouds.

    • Author Affiliations


      Jai Carol Cruz1 C N Kumar1 K N Pathak1 J Bosse2

      1. Department of Physics, Panjab University, Chandigarh 160 014, India
      2. Institute of Theoretical Physics, Freie Universität Berlin, Berlin, Germany
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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