INVESTIGADORES
CALZETTA Esteban Adolfo
artículos
Título:
Bose-Einstein condensate collapse and dynamical squeezing of vacuum fluctuations
Autor/es:
ESTEBAN CALZETTA; BEI-LOK HU
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
APS
Referencias:
Lugar: Ridge; Año: 2003 vol. 68 p. 1 - 16
ISSN:
1050-2947
Resumen:
We analyze the phenomena of condensate collapse, as described by Donley et al. @Nature 412, 295 ~2001!#et al. @Nature 412, 295 ~2001!#
and N. Claussen @Ph. D thesis, University of Colorado, 2003 ~unpublished!# by focusing on the behavior of
excitations or fluctuations above the condensate, as driven by the dynamics of the condensate, rather than the
dynamics of the condensate alone or the kinetics of the atoms. The dynamics of the condensate squeezes and
amplifies the quantum excitations, mixing the positive and negative frequency components of their wave
functions thereby creating particles that appear as bursts and jets. By analyzing the changing amplitude and
particle content of these excitations, our simple physical picture explains well the overall features of the
collapse phenomena and provides excellent quantitative fits with experimental data on several aspects, such as
the scaling behavior of the collapse time and the number of particles in the jet. The prediction of the bursts at
this level of approximation is less than satisfactory but may be improved by including the backreaction of the
excitations on the condensate. The mechanism behind the dominant effectparametric amplification of
vacuum fluctuations and freezing of modes outside of horizonis similar to that of cosmological particle
creation and structure formation in a rapid quench ~which is fundamentally different from Hawking radiation
in black holes!. This shows that Bose-Einstein condensate dynamics is a promising venue for doing laboratory
cosmology.
DOI: 10.1103/PhysRevA.68.043625 PACS number~s!: 03.75.Kk, 03.75.Gg@Ph. D thesis, University of Colorado, 2003 ~unpublished!# by focusing on the behavior of
excitations or fluctuations above the condensate, as driven by the dynamics of the condensate, rather than the
dynamics of the condensate alone or the kinetics of the atoms. The dynamics of the condensate squeezes and
amplifies the quantum excitations, mixing the positive and negative frequency components of their wave
functions thereby creating particles that appear as bursts and jets. By analyzing the changing amplitude and
particle content of these excitations, our simple physical picture explains well the overall features of the
collapse phenomena and provides excellent quantitative fits with experimental data on several aspects, such as
the scaling behavior of the collapse time and the number of particles in the jet. The prediction of the bursts at
this level of approximation is less than satisfactory but may be improved by including the backreaction of the
excitations on the condensate. The mechanism behind the dominant effectparametric amplification of
vacuum fluctuations and freezing of modes outside of horizonis similar to that of cosmological particle
creation and structure formation in a rapid quench ~which is fundamentally different from Hawking radiation
in black holes!. This shows that Bose-Einstein condensate dynamics is a promising venue for doing laboratory
cosmology.
DOI: 10.1103/PhysRevA.68.043625 PACS number~s!: 03.75.Kk, 03.75.Gg~which is fundamentally different from Hawking radiation
in black holes!. This shows that Bose-Einstein condensate dynamics is a promising venue for doing laboratory
cosmology.
DOI: 10.1103/PhysRevA.68.043625 PACS number~s!: 03.75.Kk, 03.75.Gg!. This shows that Bose-Einstein condensate dynamics is a promising venue for doing laboratory
cosmology.
DOI: 10.1103/PhysRevA.68.043625 PACS number~s!: 03.75.Kk, 03.75.Gg~s!: 03.75.Kk, 03.75.Gg