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arXiv 1902.00261math.AP
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非自治泛函局部极小的极大正则性

Maximal regularity for local minimizers of non-autonomous functionals

Peter Hästö, Jihoon Ok

摘要:

我们建立了函数\[ v\ \mapsto\ \int_Ωϕ(x,|Dv|)\,dx, \]的局部极小元的局部$C^{1,α}$ -正则性和$C^α$ -正则性,其中$ϕ$满足$(p,q)$ -增长条件.自20世纪80年代以来,建立这样一个具有尖锐、一般条件的正则性理论一直是一个悬而未决的问题。与以前的结果相比,我们制定的连续性要求$ϕ$在一个单一的条件下的地图$(x,t)\mapsto ϕ(x,t)$,而不是分别在$x$ -和$t$ -方向。因此,我们可以得到正则性的结果,而无需假设之间的差距$\frac qp$的上限和下限的增长接近$1$的泛函。此外,对于具有特定结构的$ϕ(x,t)$,包括$p$ -,Orlicz-,$p(x)$ -和双相生长,我们的单一条件意味着已知的,本质上最优的规则性条件。因此,我们以一种普遍的方式处理上述泛函的正则性理论。

英文摘要:

We establish local $C^{1,α}$-regularity for some $α\in(0,1)$ and $C^α$-regularity for any $α\in(0,1)$ of local minimizers of the functional \[ v\ \mapsto\ \int_Ωϕ(x,|Dv|)\,dx, \] where $ϕ$ satisfies a $(p,q)$-growth condition. Establishing such a regularity theory with sharp, general conditions has been an open problem since the 1980s. In contrast to previous results, we formulate the continuity requirement on $ϕ$ in terms of a single condition for the map $(x,t)\mapsto ϕ(x,t)$, rather than separately in the $x$- and $t$-directions. Thus we can obtain regularity results for functionals without assuming that the gap $\frac qp$ between the upper and lower growth bounds is close to $1$. Moreover, for $ϕ(x,t)$ with particular structure, including $p$-, Orlicz-, $p(x)$- and double phase-growth, our single condition implies known, essentially optimal, regularity conditions. Hence, we handle regularity theory for the above functional in a universal way.

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