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Statistical theory for the Kardar-Parisi-Zhang equation in (1+1) dimensions

Masoudi, A. A ; Sharif University of Technology | 2002

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevE.65.026132
  3. Publisher: 2002
  4. Abstract:
  5. The Kardar-Parisi-Zhang (KPZ) equation in (1 + 1) dimensions dynamically develops sharply connected valley structures within which the height derivative is not continuous. We develop a statistical theory for the KPZ equation in (1 + 1) dimensions driven with a random forcing that is white in time and Gaussian-correlated in space. A master equation is derived for the joint probability density function of height difference and height gradient P(h-h̄,∂xh,t) when the forcing correlation length is much smaller than the system size and much larger than the typical sharp valley width. In the time scales before the creation of the sharp valleys, we find the exact generating function of h-h̄ and ∂xh. The time scale of the sharp valley formation is expressed in terms of the force characteristics. In the stationary state, when the sharp valleys are fully developed, finite-size corrections to the scaling laws of the structure functions 〈(h-h̄)n(∂xh)m〉 are also obtained. © 2002 The American Physical Society
  6. Keywords:
  8. Source: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics ; Volume 65, Issue 2 , 2002 , Pages 026132/1-026132/22 ; 15393755 (ISSN)
  9. URL: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.65.026132