35 research outputs found
Glassy slowdown and replica-symmetry-breaking instantons
Glass-forming liquids exhibit a dramatic dynamical slowdown as the
temperature is lowered. This can be attributed to relaxation proceeding via
large structural rearrangements whose characteristic size increases as the
system cools. These cooperative rearrangements are well modeled by instantons
in a replica effective field theory, with the size of the dominant instanton
encoding the liquid's cavity point-to-set correlation length. Varying the
parameters of the effective theory corresponds to varying the statistics of the
underlying free-energy landscape. We demonstrate that, for a wide range of
parameters, replica-symmetry-breaking instantons dominate. The detailed
structure of the dominant instanton provides a rich window into point-to-set
correlations and glassy dynamics.Comment: 6 pages, 3 figures; v2: narrative revised to clarify our
effective-theoretic viewpoint, results unchanged, added reference
Disordered holographic systems: Marginal relevance of imperfection
We continue our study of quenched disorder in holographic systems, focusing on the effects of mild electric disorder. By studying the renormalization group evolution of the disorder distribution at subleading order in perturbations away from the clean fixed point, we show that electric disorder is marginally relevant in (2 + 1)-dimensional holographic conformal field theories.United States. Dept. of Energy (Contract DE-FC02-94ER40818