Zobrazeno 1 - 10
of 113
pro vyhledávání: '"Gardiner, C W"'
Autor:
Sahlberg, Catarina E, Gardiner, C W
We formulate the basic theoretical methods for Bose-Einstein Condensation of atoms close to a Feshbach resonance, in which the tunable scattering length of the atoms is described using a system of coupled atom and molecule fields. These include the T
Externí odkaz:
http://arxiv.org/abs/1109.2971
We present a theoretical model for Bragg scattering from a Bose-Einstein condensate (BEC) in the vicinity of a magnetic Feshbach resonance, using a two c-field formalism, one c-field for the atom and the other for a molecule formed of two atoms. We u
Externí odkaz:
http://arxiv.org/abs/1109.2977
Autor:
Sahlberg, Catarina E, Gardiner, C W
We present a model of a coupled bosonic atom-molecule system, using the recently developed c-field methods as the basis in our formalism. We derive expressions for the s-wave scattering length and binding energy within this formalism, and by relating
Externí odkaz:
http://arxiv.org/abs/1109.2956
Publikováno v:
Advances in Physics, 57, 363 (2008)
We review phase space techniques based on the Wigner representation that provide an approximate description of dilute ultra-cold Bose gases. In this approach the quantum field evolution can be represented using equations of motion of a similar form t
Externí odkaz:
http://arxiv.org/abs/0809.1487
Publikováno v:
Phys. Rev. A 78, 063601 (2008)
We present a quantum mechanical treatment of the mechanical stirring of Bose-Einstein condensates using classical field techniques. In our approach the condensate and excited modes are described using a Hamiltonian classical field method in which the
Externí odkaz:
http://arxiv.org/abs/0808.3552
Publikováno v:
PoSQG-Ph:044,2007
We present a toy model where spacetime is emergent from a more fundamental microscopic system, and investigate the gray area interpolating between the collective and free-particle regimes. For a period of rapid exponential growth in the analogue univ
Externí odkaz:
http://arxiv.org/abs/0804.1346
Publikováno v:
Class.Quant.Grav.26:065012,2009
We investigate cosmological particle production in spacetimes where Lorentz invariance emerges in the infrared limit, but is explicitly broken in the ultraviolet regime. Our specific model focuses on the boost subgroup that supports CPT invariance an
Externí odkaz:
http://arxiv.org/abs/0801.2673
Publikováno v:
Phys. Rev. A 77, 033616 (2008)
We develop a stochastic Gross-Pitaveskii theory suitable for the study of Bose-Einstein condensation in a {\em rotating} dilute Bose gas. The theory is used to model the dynamical and equilibrium properties of a rapidly rotating Bose gas quenched thr
Externí odkaz:
http://arxiv.org/abs/0712.3436
Publikováno v:
Phys. Rev. A 76, 023617 (2007)
We study an experimentally realizable system containing stable black hole-white hole acoustic horizons in toroidally trapped Bose-Einstein condensates - the quantum de Laval nozzle. We numerically obtain stationary flow configurations and assess thei
Externí odkaz:
http://arxiv.org/abs/0705.3093
Publikováno v:
Phys. Rev. A 76, 033616 (2007)
Analogue models of gravity have been motivated by the possibility of investigating phenomena not readily accessible in their cosmological counterparts. In this paper, we investigate the analogue of cosmological particle creation in a Friedmann-Robert
Externí odkaz:
http://arxiv.org/abs/0705.2077