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Communications in Mathematical Physics

Effective Dynamics of a Tracer Particle Interacting with an Ideal Bose Gas

Dirk-André Deckert, Jürg Martin Fröhlich, Peter Pickl, Alessandro Pizzo

Published Apr 7, 2014• 13 citations
Publisher
DOI
10.1007/s00220-014-1987-z

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Effective Dynamics of a Tracer Particle Interacting with an Ideal Bose Gas

Dirk-André Deckert, Jürg Martin Fröhlich, Peter Pickl +1 more

We study a system consisting of a heavy quantum particle, called tracer particle, coupled to an ideal gas of light Bose particles, the ratio of masses of the tracer particle and a gas particle being proportional to the gas density. All particles have non-relativistic kinematics. The tracer particle is driven by an external potential and couples to the gas particles through a pair potential. We compare the quantum dynamics of this system to an effective dynamics given by a Newtonian equation of motion for the tracer particle coupled to a classical wave equation for the Bose gas. We quantify the closeness of these two dynamics as the mean-field limit is approached (gas density $\to\infty$). Our estimates allow us to interchange the thermodynamic with the mean-field limit.

arXiv:1210.0253•Sep 30, 2012•1 citation

Effective Dynamics of a Tracer Particle Interacting with an Ideal Bose Gas - eScholarship

Dirk-André Deckert, Jürg Martin Fröhlich, Peter Pickl +1 more

We study a system consisting of a heavy quantum particle, called tracer particle, coupled to an ideal gas of light Bose particles, the ratio of masses of the tracer particle and a gas particle being proportional to the gas density. All particles have non-relativistic kinematics. The tracer particle is driven by an external potential and couples to the gas particles through a pair potential. We compare the quantum dynamics of this system to an effective dynamics given by a Newtonian equation of motion for the tracer particle coupled to a classical wave equation for the Bose gas. We quantify the closeness of these two dynamics as the mean-field limit is approached (gas density $\to\infty$). Our estimates allow us to interchange the thermodynamic with the mean-field limit.

•Sep 30, 2012•1 citation
We study a system consisting of a heavy quantum particle, called tracer particle, coupled to an ideal gas of light Bose particles, the ratio of masses of the tracer particle and a gas particle being proportional to the gas density. All particles have non-relativistic kinematics. The tracer particle is driven by an external potential and couples to the gas particles through a pair potential. We compare the quantum dynamics of this system to an effective dynamics given by a Newtonian equation of motion for the tracer particle coupled to a classical wave equation for the Bose gas. We quantify the closeness of these two dynamics as the mean-field limit is approached (gas density →∞\to\infty→∞). Our estimates allow us to interchange the thermodynamic with the mean-field limit.
We study a system consisting of a heavy quantum particle, called tracer particle, coupled to an ideal gas of light Bose particles, the ratio of masses of the tracer particle and a gas particle being proportional to the gas density. All particles have non-relativistic kinematics. The tracer particle is driven by an external potential and couples to the gas particles through a pair potential. We compare the quantum dynamics of this system to an effective dynamics given by a Newtonian equation of motion for the tracer particle coupled to a classical wave equation for the Bose gas. We quantify the closeness of these two dynamics as the mean-field limit is approached (gas density →∞\to\infty→∞). Our estimates allow us to interchange the thermodynamic with the mean-field limit.