Aspects of Cosmic Inflation in Expanding Bose-Einstein Condensates [PDF]
, 2005 Phonons in expanding Bose-Einstein condensates with wavelengths much larger than the healing length behave in the same way as quantum fields within a universe undergoing an accelerated expansion. This analogy facilitates the application of many tools and
Abramowitz M +16 more
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Kinetic theory and dynamic structure factor of a condensate in the random phase approximation [PDF]
, 2004 We present the microscopic kinetic theory of a homogeneous dilute Bose condensed gas in the generalized random phase approximation (GRPA), which satisfies the following requirements: 1) the mass, momentum and energy conservation laws; 2) the H-theorem; 3)
A. J. Leggett +10 more
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Spin dynamics and structure formation in a spin-1 condensate in a magnetic field [PDF]
, 2016 7 págs.; 5 figs.; PACS number s : 03.75.Mn, 03.75.Kk, 71.15.MbWe study the dynamics of a trapped spin-1 condensate in a magnetic field. First, we analyze the homogeneous system, for which the dynamics can be understood in terms of orbits in phase space ...
Mur-Petit, Jordi
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Dynamic Density Response of Trapped Interacting Quantum Gases [PDF]
, 2011 An expression for the dynamic density response function has been obtained for an interacting quantum gas in Random Phase Approximation (RPA) including first order self and exchange contribution.
Bala, Renu, Bosse, J., Pathak, K. N.
core +2 more sources
Hydrodynamics of local excitations after an interaction quench in 1D cold atomic gases
New Journal of Physics, 2016 We discuss the hydrodynamic approach to the study of the time evolution—induced by a quench—of local excitations in one dimension. We focus on interaction quenches: the considered protocol consists of creating a stable localized excitation propagating ...
Fabio Franchini +2 more
doaj +1 more source
Birth of a quasi-stationary black hole in an outcoupled Bose–Einstein condensate
New Journal of Physics, 2014 We study the evolution of an initially confined atom condensate, which is progressively outcoupled by gradually lowering the confining barrier on one side. The goal is to identify protocols that best lead to a quasi-stationary sonic black hole separating
J R M de Nova +3 more
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Low temperature dynamics of nonlinear Luttinger liquids
New Journal of Physics, 2015 We develop a general nonlinear Luttinger liquid theory to describe the dynamics of one-dimensional quantum critical systems at low temperatures. To demonstrate the predictive power of our theory we compare results for the autocorrelation G ( t ) in the ...
C Karrasch, R G Pereira, J Sirker
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Comment on ``Sound velocity and multibranch Bogoliubov spectrum of an elongated Fermi superfluid in the BEC-BCS crossover" [PDF]
, 2006 The work by T. K. Ghosh and K. Machida [cond-mat/0510160 and Phys. Rev. A 73, 013613 (2006)] on the sound velocity in a cylindrically confined Fermi superfluid obeying a power-law equation of state is shown to make use of an improper projection of the ...
F. Federici +5 more
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Superfluid Bloch dynamics in an incommensurate optical lattice
New Journal of Physics, 2014 We investigate the interplay of disorder and interactions in the accelerated transport of a Bose–Einstein condensate through an incommensurate optical lattice.
J B Reeves +4 more
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Self-interference of a toroidal Bose–Einstein condensate
New Journal of Physics, 2014 We demonstrate the self-interference of a single Bose–Einstein condensate on a non-simply connected geometry, focussing on a toroidally trapped ring-shaped condensate.
L A Toikka
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