<p>We prove a result on stochastic homogenisation of integral functionals of the form <Equation ID="Equ44"> <EquationSource Format="TEX">\(\begin{aligned} \int _{U} f\Big (\omega , x/\varepsilon , {\mathbb {A}}u\Big ) \textrm{d} x \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <msub> <mo>∫</mo> <mi>U</mi> </msub> <mi>f</mi> <mrow> <mo maxsize="1.623em" minsize="1.623em" stretchy="true">(</mo> </mrow> <mi>ω</mi> <mo>,</mo> <mi>x</mi> <mo stretchy="false">/</mo> <mi>ε</mi> <mo>,</mo> <mi mathvariant="double-struck">A</mi> <mi>u</mi> <mrow> <mo maxsize="1.623em" minsize="1.623em" stretchy="true">)</mo> </mrow> <mtext>d</mtext> <mi>x</mi> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>where <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\omega \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>ω</mi> </math></EquationSource> </InlineEquation> is a random parameter, <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\varepsilon &gt;0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>ε</mi> <mo>&gt;</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({\mathbb {A}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="double-struck">A</mi> </math></EquationSource> </InlineEquation> is a real elliptic vectorial differential operator. This work is intended to generalise results for the full gradient and to cover the cases of the symmetric gradient and the deviatoric operator. The homogenisation procedure is carried out by employing a variant of the blow-up method in the setting of <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({\mathbb {A}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="double-struck">A</mi> </math></EquationSource> </InlineEquation>-Sobolev spaces along with the Akcloglu-Krengel subadditive ergodic theorem.</p>

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Stochastic homogenisation of nonconvex elliptic integrals

  • Piotr Wozniak

摘要

We prove a result on stochastic homogenisation of integral functionals of the form \(\begin{aligned} \int _{U} f\Big (\omega , x/\varepsilon , {\mathbb {A}}u\Big ) \textrm{d} x \end{aligned}\) U f ( ω , x / ε , A u ) d x where \(\omega \) ω is a random parameter, \(\varepsilon >0\) ε > 0 and \({\mathbb {A}}\) A is a real elliptic vectorial differential operator. This work is intended to generalise results for the full gradient and to cover the cases of the symmetric gradient and the deviatoric operator. The homogenisation procedure is carried out by employing a variant of the blow-up method in the setting of \({\mathbb {A}}\) A -Sobolev spaces along with the Akcloglu-Krengel subadditive ergodic theorem.