Comment on ``Nonuniversal Exponents in Interface Growth''
Hugues Chat\'e, Qing-Hu Chen, Lei-Han Tang
TL;DR
This paper critiques the claim that KPZ surface growth exponents are nonuniversal, attributing observed variations to percolative effects rather than fundamental nonuniversality.
Contribution
It clarifies that the observed changes in exponents are due to percolation phenomena, challenging the idea of nonuniversal KPZ exponents based on noise distribution.
Findings
Surface roughness exponent variations are due to percolative effects.
The claim of nonuniversality in KPZ exponents is challenged.
Percolation effects influence surface growth behavior.
Abstract
Recently, Newman and Swift[T. J. Newman and M. R. Swift, Phys. Rev. Lett. {\bf 79}, 2261 (1997)] made an interesting suggestion that the strong-coupling exponents of the Kardar-Parisi-Zhang (KPZ) equation may not be universal, but rather depend on the precise form of the noise distribution. We show here that the decrease of surface roughness exponents they observed can be attributed to a percolative effect.
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