As an indicator of cooperative motion in a system of Brownian particles that models two-dimensional colloidal liquids, a displacement correlation tensor is calculated analytically and compared with numerical results. The key idea for the analytical calculation is to relate the displacement correlation tensor, which is a kind of four-point space-time correlation, to the Lagrangian two-time correlation of the deformation gradient tensor. Tensorial treatment of the statistical quantities, including the displacement correlation itself, allows capturing the vortical structure of the cooperative motion. The calculated displacement correlation also implies a negative long-time tail in the velocity autocorrelation, which is a manifestation of the cage effect. Both the longitudinal and transverse components of the displacement correlation are found to be expressible in terms of a similarity variable, suggesting that the cages are nested to form a self-similar structure in the space-time.
Calculation of displacement correlation tensor indicating vortical cooperative motion in two-dimensional colloidal liquids.
Takeshi Ooshida,S. Goto,T. Matsumoto,M. Otsuki
Published 2016 in Physical Review E
ABSTRACT
PUBLICATION RECORD
- Publication year
2016
- Venue
Physical Review E
- Publication date
2016-04-12
- Fields of study
Medicine, Physics, Chemistry, Mathematics
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
CITATION MAP
EXTRACTION MAP
CLAIMS
CONCEPTS
- brownian particles
The model particles whose stochastic motion is used to represent the colloidal liquid.
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewAK (4715169a40) review - cage effect
The transient trapping of a particle by its neighbors in a dense liquid environment.
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewAK (4715169a40) review - deformation gradient tensor
A tensor that describes local deformation and is used in its Lagrangian two-time correlation.
Aliases: deformation gradient
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewAK (4715169a40) review - displacement correlation tensor
A tensor-valued correlation of particle displacements used to characterize cooperative motion in the colloidal liquid.
Aliases: displacement-correlation tensor
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewAK (4715169a40) review - similarity variable
A scaling variable used to express the longitudinal and transverse displacement-correlation components in a common form.
Aliases: scaling variable
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewAK (4715169a40) review - two-dimensional colloidal liquids
The two-dimensional dense colloidal system studied as the setting for the cooperative dynamics.
Aliases: 2D colloidal liquids
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewAK (4715169a40) review - velocity autocorrelation
The time correlation of a particle's velocity, considered here for its long-time behavior.
Aliases: VACF
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewAK (4715169a40) review - vortical cooperative motion
Coordinated particle motion with vortex-like spatial structure in the colloidal liquid.
Aliases: vortical motion
박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewKiller Whale (322360f1c1) reviewAK (4715169a40) review
REFERENCES
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