| Authors: |
A. Cavagna
and T.S. Grigera
and P. Verrocchio
|
| Editors: |
Luciano Pietronero
and Vittorio Loreto
and Stefano Zapperi
|
| URL: |
http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=682 |
| Tags: |
characteristic
constrained
glass
lenghts
montecarlo
mosaic
optimized
scenario
statphys23
systems
topic-9
transition
|
| Abstract: |
We test the mosaic scenario through numerical simulations of a simple glass-former. According to such scenario, relaxation below the Mode Coupling temperature is ruled by two competing mechanisms: surface tension, opposing the creation of local excitations, and entropy, providing the drive to the configurational rearrangement of a given region. Given an equilibrated configuration, we freeze all the particles outside a sphere and study the thermodynamics of this sphere. The frozen environment acts as a pinning field. By measuring the {\em global} overlap between the unpinned and pinned equilibrium configurations of the sphere, we can see whether it has switched to a different state or not. With this observable, we do not find any clear evidence of the standard mosaic scenario and our results seem rather compatible with the existence of one single state, the liquid. However, a refined mosaic, incorporating a (broad) distribution of surface tension, could still reconcile
at very low temperature numeric data on more sensitive observables, such as {\em local} overlaps, and the mosaic scenario. |
@incollection{statphys23_0682,
title = {Mosaic multi-state scenario vs. one-state description of glass-formers},
address = {Genova, Italy},
author = {A. Cavagna and T.S. Grigera and P. Verrocchio},
booktitle = {Abstract Book of the XXIII IUPAP International Conference on Statistical Physics},
editor = {Luciano Pietronero and Vittorio Loreto and Stefano Zapperi},
month = {9-13 July},
url = {http://st23.statphys23.org/webservices/abstract/preview_pop.php?ID_PAPER=682},
year = {2007},
abstract = {We test the mosaic scenario through numerical simulations of a simple glass-former. According to such scenario, relaxation below the Mode Coupling temperature is ruled by two competing mechanisms: surface tension, opposing the creation of local excitations, and entropy, providing the drive to the configurational rearrangement of a given region. Given an equilibrated configuration, we freeze all the particles outside a sphere and study the thermodynamics of this sphere. The frozen environment acts as a pinning field. By measuring the {\em global} overlap between the unpinned and pinned equilibrium configurations of the sphere, we can see whether it has switched to a different state or not. With this observable, we do not find any clear evidence of the standard mosaic scenario and our results seem rather compatible with the existence of one single state, the liquid. However, a refined mosaic, incorporating a (broad) distribution of surface tension, could still reconcile
at very low temperature numeric data on more sensitive observables, such as {\em local} overlaps, and the mosaic scenario.},
keywords = {characteristic constrained glass lenghts montecarlo mosaic optimized scenario statphys23 systems topic-9 transition }
}
::