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arXiv 1708.09147math.AP
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一般双相位泛函的正则性

Regularity for general functionals with double phase

Paolo Baroni, Maria Colombo, Giuseppe Mingione

摘要:

我们证明了尖锐的正则性结果的一般类泛函的类型$$ w \mapsto \int F(x, w, Dw) \, dx\;, $$具有非标准的增长条件和非一致椭圆性属性。模型情况由双相积分$$ w \mapsto \int b(x,w)(|Dw|^p+a(x)|Dw|^q) \, dx\;,\quad 1 <p < q\,, \quad a(x)\geq 0\;, $$和$0<ν\leq b(\cdot)\leq L $给出。这根据调制系数$a(\cdot)$的水平集$\{a(x)=0\}$的几何形状来改变其椭圆率。我们还提出了新的方法和证明,这是适合于建立更大类的非自治泛函的正则性定理。最后,我们揭示了一些新的插值类型的影响,因为我们猜想,应该得出一个普遍的现象,在设置的非均匀椭圆问题。这种效应自然与拉夫连季耶夫现象有关。

英文摘要:

We prove sharp regularity results for a general class of functionals of the type $$ w \mapsto \int F(x, w, Dw) \, dx\;, $$ featuring non-standard growth conditions and non-uniform ellipticity properties. The model case is given by the double phase integral $$ w \mapsto \int b(x,w)(|Dw|^p+a(x)|Dw|^q) \, dx\;,\quad 1 <p < q\,, \quad a(x)\geq 0\;, $$ with $0<ν\leq b(\cdot)\leq L $. This changes its ellipticity rate according to the geometry of the level set $\{a(x)=0\}$ of the modulating coefficient $a(\cdot)$. We also present new methods and proofs, that are suitable to build regularity theorems for larger classes of non-autonomous functionals. Finally, we disclose some new interpolation type effects that, as we conjecture, should draw a general phenomenon in the setting of non-uniformly elliptic problems. Such effects naturally connect with the Lavrentiev phenomenon.

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