Regularity in the two-phase free boundary problems under non-standard growth conditions

TL;DR

This paper establishes regularity results for heterogeneous two-phase free boundary problems under non-standard growth conditions, covering various physical models and extending previous work to both degenerate and singular cases.

Contribution

It provides new regularity results for two-phase free boundary problems with non-standard growth, including degenerate and singular cases, extending prior research.

Findings

Regularity results for free boundary problems under non-standard growth.

Applicability to heterogeneous jets, cavities, and chemical reactions.

Extension to both degenerate ($p>2$) and singular ($1<p<2$) cases.

Abstract

In this paper, we prove several regularity results for the heterogeneous, two-phase free boundary problems $\mathcal {J}_{\gamma}(u)=\int_{\Omega}\big(f(x,\nabla u)+\lambda_{+} (u^{+})^{\gamma}+\lambda_{-}(u^{-})^{\gamma}+gu\big)\text{d}x\rightarrow \text{min}$ under non-standard growth conditions. Included in such problems are heterogeneous jets and cavities of Prandtl-Batchelor type with $\gamma=0$, chemical reaction problems with $0<\gamma<1$, and obstacle type problems with $\gamma=1$. Our results hold not only in the degenerate case of $p> 2$ for $p-$Laplace equations, but also in the singular case of $1<p<2$, which are extensions of \cite{LdT}.