تقرير
Long-time behavior of solutions to the generalized Allen-Cahn model with degenerate diffusivity
| العنوان: | Long-time behavior of solutions to the generalized Allen-Cahn model with degenerate diffusivity |
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| المؤلفون: | Folino, Raffaele, Ríos, Luis F. López, Plaza, Ramón G. |
| المصدر: | Nonlinear Differ. Equ. Appl. 29, 45 (2022) |
| سنة النشر: | 2020 |
| المجموعة: | Mathematics |
| مصطلحات موضوعية: | Mathematics - Analysis of PDEs |
| الوصف: | The generalized Allen-Cahn equation, \[ u_t=\varepsilon^2(D(u)u_x)_x-\frac{\varepsilon^2}2D'(u)u_x^2-F'(u), \] with nonlinear diffusion, $D = D(u)$, and potential, $F = F(u)$, of the form \[ D(u) = |1-u^2|^{m}, \quad \text{or} \quad D(u) = |1-u|^{m}, \quad m >1, \] and \[ F(u)=\frac{1}{2n}|1-u^2|^{n}, \qquad n\geq2, \] respectively, is studied. These choices correspond to a reaction function that can be derived from a double well potential, and to a generalized degenerate diffusivity coefficient depending on the density $u$ that vanishes at one or at the two wells, $u = \pm 1$. It is shown that interface layer solutions that are equal to $\pm 1$ except at a finite number of thin transitions of width $\varepsilon$ persist for an either exponentially or algebraically long time, depending upon the interplay between the exponents $n$ and $m$. For that purpose, energy bounds for a renormalized effective energy potential of Ginzburg-Landau type are derived. Comment: 33 pages, 2 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1007/s00030-022-00779-y |
| URL الوصول: | http://arxiv.org/abs/2012.05971 |
| رقم الأكسشن: | edsarx.2012.05971 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1007/s00030-022-00779-y |
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