Mapping dynamical heterogeneity in structural glasses to correlated fluctuations of the time variables

Details Mapping dynamical heterogeneity in structural glasses to correlated fluctuations of the time variables Mapping dynamical heterogeneity in structural glasses to correlated fluctuations of the time variables

2010-07-04

arxiv.org/abs/1007.0520v4

Phys. Rev. Lett. 107, 265702 (2011)

Physics

Condensed Matter

Soft Condensed Matter

v4: Detailed analysis of transverse and longitudinal parts. One figure removed, two added. v3: Explicit decomposition into tra

Scientific paper

10.1103/PhysRevLett.107.265702

Dynamical heterogeneities -- strong fluctuations near the glass transition -- are believed to be crucial to explain much of the glass transition phenomenology. One possible hypothesis for their origin is that they emerge from soft (Goldstone) modes associated with a broken continuous symmetry under time reparametrizations. To test this hypothesis, we use numerical simulation data from four glass-forming models to construct coarse grained observables that probe the dynamical heterogeneity, and decompose the fluctuations of these observables into two transverse components associated with the postulated time-fluctuation soft modes and a longitudinal component unrelated to them. We find that as temperature is lowered and timescales are increased, the time reparametrization fluctuations become increasingly dominant, and that their correlation volumes grow together with the correlation volumes of the dynamical heterogeneities, while the correlation volumes for longitudinal fluctuations remain small.

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