Math @ Duke

Publications [#356176] of Yuan Gao
search scholar.google.com.Papers Published
 Gao, Y; Lu, XY; Wang, C, Regularity and monotonicity for solutions to a continuum model of epitaxial growth with nonlocal elastic effects,
Advances in Calculus of Variations
(January, 2021) [doi]
(last updated on 2021/07/29)
Abstract: We study the following parabolic nonlocal 4th order degenerate equation: Ut=[2â πâ Hâ (ux)+lnâi (uxâ x+a)+32â (uxâ x+a)2]xâ x,u{t}=\Bigl{[}2\pi H(u{x})+\ln(u{XX}+a)+\frac{3}{2}(u{XX}+a){2}\Bigr{]}{% XX}, arising from the epitaxial growth on crystalline materials. Here H denotes the Hilbert transform, and a>0{a>0} is a given parameter. By relying on the theory of gradient flows, we first prove the global existence of a variational inequality solution with a general initial datum. Furthermore, to obtain a global strong solution, the main difficulty is the singularity of the logarithmic term when uxâ x+a{u{XX}+a} approaches zero. Thus we show that, if the initial datum u0{u{0}} is such that (u0)xâ x+a{(u{0}){XX}+a} is uniformly bounded away from zero, then such property is preserved for all positive times. Finally, we will prove several higher regularity results for this global strong solution. These finer properties provide a rigorous justification for the globalintime monotone solution to the epitaxial growth model with nonlocal elastic effects on vicinal surface.


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