منابع مشابه
Langevin Interpretation of Kadanoff-baym Equations
We show that the nonperturbative quantum transport equations, the ‘KadanoffBaym equations’, can be be understood as the ensemble average over stochastic equations of Langevin type. For this we couple a free scalar boson quantum field to an environmental heat bath with some given temperature T . The inherent presence of noise and dissipation related by the fluctuation-dissipation theorem guarant...
متن کاملBoltzmann equation for a trapped Bose - condensed gas using the Kadanoff - Baym formalism ∗
Using the Kadanoff-Baym non-equilibrium Green's function formalism, we derive kinetic equations for the non-condensate atoms at finite temperatures which include the effect of binary collisions between atoms. The effect of collisions is included using the second-order self-energy given by the Beli-aev (gapless) approximation. We limit our discussion to finite temperatures where we can use the s...
متن کاملKadanoff–baym Equations with Initial Correlations
The Kadanoff–Baym equations (KBE) are usually derived under the assumption of the weakening of initial correlations (Bogolyubov’s condition) and, therefore, fail to correctly describe the short time behavior. We demonstrate that this assumption is not necessary. Using functional derivatives techniques, we present a straightforward generalization of the KBE which allows to include arbitrary init...
متن کاملSuccesses and Failures of Kadanoff-Baym Dynamics in Hubbard Nanoclusters
We study the non-equilibrium dynamics of small, strongly correlated clusters, described by a Hubbard Hamiltonian, by propagating in time the Kadanoff-Baym equations within the HartreeFock, 2 Born, GW and T-matrix approximations. We compare the results to exact numerical solutions. We find that the T-matrix is overall superior to the other approximations, and is in good agreement with the exact ...
متن کاملSuccesses and failures of Kadanoff-Baym dynamics in Hubbard nanoclusters.
We study the nonequilibrium dynamics of small, strongly correlated clusters, described by a Hubbard Hamiltonian, by propagating in time the Kadanoff-Baym equations within the Hartree-Fock, second Born, GW, and T-matrix approximations. We compare the results to exact numerical solutions. We find that the time-dependent T matrix is overall superior to the other approximations, and is in good agre...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2006
ISSN: 1742-6588,1742-6596
DOI: 10.1088/1742-6596/35/1/036