122 research outputs found
Absence of Fragmentation in Two-Dimensional Bose-Einstein Condensation
We investigate the possibility that the BEC-like phenomena recently detected
on two-dimensional finite trapped systems consist of fragmented condensates. We
derive and diagonalize the one-body density matrix of a two-dimensional
isotropically trapped Bose gas at finite temperature. For the ideal gas, the
procedure reproduces the exact harmonic-oscillator eigenfunctions and the Bose
distribution. We use a new collocation-minimization method to study the
interacting gas in the Hartree-Fock approximation and obtain a ground-state
wavefunction and condensate fraction consistent with those obtained by other
methods. The populations of the next few eigenstates increase at the expense of
the ground state but continue to be negligible; this supports the conclusion
that two-dimensional BEC is into a single state.Comment: 6 pages, 1 figur
Aplicaciin De La Serie De Taylor, Duraciin Y Convexidad En La Determinaciin De La Tasa De Interrs Efectiva De Un Instrumento Financiero De Renta Fija Contabilizado a Costo Amortizado (An Application of Taylor Series, Duration and Convexity for Estimating the Effective Interest Rate of a Fixed-Income Financial Instrument Measured at Amortized Cost)
Multivariate Moments Expansion Density: Application of the Dynamic Equicorrelation Model
Do the Rich (Really) Consume Higher-Quality Goods? Evidence from International Trade Data
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