Comment on "Macrospopic Equation for the Roughness of Growing Interfaces in Quenched Disorder"

Details Comment on "Macrospopic Equation for the Roughness of Growing Interfaces in Quenched Disorder" Comment on "Macrospopic Equation for the Roughness of Growing Interfaces in Quenched Disorder"

1999-03-08

arxiv.org/abs/cond-mat/9903131v1

Physical Review Letters 82, p.1337 (1999)

Physics

Condensed Matter

Statistical Mechanics

1 page, 1 figure, uses epsf

Scientific paper

10.1103/PhysRevLett.82.1337

We comment on a recent Letter by Braunstein and Buceta [PRL vol.81, 630 (1998)], in which a novel equation has been proposed to describe the dynamics of interfaces in the presence of quenched disorder. We argue that the ansatz Braunstein and Buceta presented is just an effective description of the very short times regime and has no significance for the macroscopic (large scale) behaviour of the interface. We calculate an expression for the short time behaviour of the interface that is valid for any q (and not only at q_c).

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