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• W1981180601 abstract "We study the relation between short-time vibrational modes and long-time relaxational dynamics in a kinetically constrained lattice gas with harmonic interactions between neighbouring particles. We find a correlation between the location of the low- (high-) frequency vibrational modes and regions of high (low) propensity for motion. This is similar to what was observed in continuous force systems, but our interpretation is different: in our case relaxation is due to localised excitations which propagate through the system; these localised excitations act as background disorder for the elastic network, giving rise to anomalous vibrational modes. Our results provide an example whereby a correlation between spatially extended low-frequency modes and high-propensity regions does not imply that relaxational dynamics originates in extended soft modes but rather belies their common origin. We consider other measures of elastic heterogeneity, such as non-affine displacement fields and mode localisation lengths, and discuss implications of our results to interpretations of dynamic heterogeneity more generally." @default.
• W1981180601 created "2016-06-24" @default.
• W1981180601 creator A5034908857 @default.
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• W1981180601 date "2009-10-27" @default.
• W1981180601 modified "2023-10-16" @default.
• W1981180601 title "Relationship between vibrations and dynamical heterogeneity in a model glass former: Extended soft modes but local relaxation" @default.
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• W1981180601 doi "https://doi.org/10.1140/epje/i2009-10531-6" @default.
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