Allen-Cahn equation with strong irreversibility

TL;DR

This paper studies a nonlinear Allen-Cahn equation with irreversibility constraints, establishing well-posedness, long-term behavior, and reformulating it as an obstacle problem to understand solution dynamics.

Contribution

It introduces a novel analysis of a strongly irreversible Allen-Cahn equation, including well-posedness, smoothing effects, and long-time convergence to obstacle problem solutions.

Findings

Proved well-posedness and comparison principle.

Constructed a global attractor for the system.

Showed solutions converge to elliptic obstacle problem solutions.

Abstract

This paper is concerned with a fully nonlinear variant of the Allen-Cahn equation with strong irreversibility, where each solution is constrained to be non-decreasing in time. Main purposes of the paper are to prove the well-posedness, smoothing effect and comparison principle, to provide an equivalent reformulation of the equation as a parabolic obstacle problem and to reveal long-time behaviors of solutions. More precisely, by deriving \emph{partial} energy-dissipation estimates, a global attractor is constructed in a metric setting, and it is also proved that each solution $u(x,t)$ converges to a solution of an elliptic obstacle problem as $t \to +\infty$.