Power functional theory for Brownian dynamics
- Schmidt, Matthias Theoretische Physik II, Physikalisches Institut, Universität Bayreuth, Germany
- Brader, Joseph M. Soft Matter Theory, University of Fribourg, Switzerland
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03.06.2013
Published in:
- The Journal of Chemical Physics. - 2013, vol. 138, no. 21, p. 214101
English
Classical density functional theory (DFT) provides an exact variational framework for determining the equilibrium properties of inhomogeneous fluids. We report a generalization of DFT to treat the non-equilibrium dynamics of classical many-body systems subject to Brownian dynamics. Our approach is based upon a dynamical functional consisting of reversible free energy changes and irreversible power dissipation. Minimization of this “free power” functional with respect to the microscopic one-body current yields a closed equation of motion. In the equilibrium limit the theory recovers the standard variational principle of DFT. The adiabatic dynamical density functional theory is obtained when approximating the power dissipation functional by that of an ideal gas. Approximations to the excess (over ideal) power dissipation yield numerically tractable equations of motion beyond the adiabatic approximation, opening the door to the systematic study of systems far from equilibrium.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 136725
- DOI 10.1063/1.4807586
- Persistent URL
- https://folia.unifr.ch/unifr/documents/303165
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