<p>We investigate the weighted boundedness for a class of local lacunary maximal operators on arbitrary homogeneous Lie groups. On <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10958_2025_7836_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="25" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathbb {R}^n,\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msup> <mrow> <mi mathvariant="double-struck">R</mi> </mrow> <mi>n</mi> </msup> <mo>,</mo> </mrow> </math></EquationSource> </InlineEquation> we analyse the <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10958_2025_7836_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="20" /> </InlineMediaObject> <EquationSource Format="TEX">\(L^p\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>L</mi> <mi>p</mi> </msup> </math></EquationSource> </InlineEquation>-<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10958_2025_7836_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="20" /> </InlineMediaObject> <EquationSource Format="TEX">\(L^q\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>L</mi> <mi>q</mi> </msup> </math></EquationSource> </InlineEquation>-boundedness for a class of local lacunary maximal functions on weighted spaces. Our analysis covers weighted dyadic maximal functions as the following ones: <Equation ID="Equ54"> <MediaObject> <ImageObject Color="BlackWhite" FileRef="10958_2025_7836_Article_Equ54.gif" Format="GIF" Height="41" Rendition="HTML" Resolution="72" Type="Linedraw" Width="450" /> </MediaObject> <EquationSource Format="TEX">\( M_{D,\alpha }^{d\sigma }f(x)=\sup _{j\in \mathbb {Z}:j&lt;0}|\frac{1}{2^{j\alpha }}\smallint \limits _{\mathbb {S}^{n-1}}f(x-2^{j}y)|x-2^{j}y|^{\alpha }d\sigma (y)|,\,\alpha &lt;0, \)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <msubsup> <mi>M</mi> <mrow> <mi>D</mi> <mo>,</mo> <mi>α</mi> </mrow> <mrow> <mi>d</mi> <mi>σ</mi> </mrow> </msubsup> <mi>f</mi> <mrow> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <munder> <mo movablelimits="true">sup</mo> <mrow> <mi>j</mi> <mo>∈</mo> <mi mathvariant="double-struck">Z</mi> <mo>:</mo> <mi>j</mi> <mo>&lt;</mo> <mn>0</mn> </mrow> </munder> <mrow> <mo stretchy="false">|</mo> </mrow> <mfrac> <mn>1</mn> <msup> <mn>2</mn> <mrow> <mi>j</mi> <mi>α</mi> </mrow> </msup> </mfrac> <msub> <mo largeop="false">∫</mo> <msup> <mrow> <mi mathvariant="double-struck">S</mi> </mrow> <mrow> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </msup> </msub> <mi>f</mi> <mrow> <mo stretchy="false">(</mo> <mi>x</mi> <mo>-</mo> <msup> <mn>2</mn> <mi>j</mi> </msup> <mi>y</mi> <mo stretchy="false">)</mo> </mrow> <mrow> <mo stretchy="false">|</mo> <mi>x</mi> <mo>-</mo> </mrow> <msup> <mn>2</mn> <mi>j</mi> </msup> <mi>y</mi> <mrow> <msup> <mo stretchy="false">|</mo> <mi>α</mi> </msup> <mi>d</mi> <mi>σ</mi> <mrow> <mo stretchy="false">(</mo> <mi>y</mi> <mo stretchy="false">)</mo> </mrow> <mo stretchy="false">|</mo> </mrow> <mo>,</mo> <mspace width="0.166667em" /> <mi>α</mi> <mo>&lt;</mo> <mn>0</mn> <mo>,</mo> </mrow> </math></EquationSource> </Equation>and also dyadic maximal operators of the form <Equation ID="Equ55"> <MediaObject> <ImageObject Color="BlackWhite" FileRef="10958_2025_7836_Article_Equ55.gif" Format="GIF" Height="35" Rendition="HTML" Resolution="72" Type="Linedraw" Width="413" /> </MediaObject> <EquationSource Format="TEX">\( M_{D,\delta ,\rho }^{d\sigma }f(x)=\sup _{j\in \mathbb {Z}:j&lt;0}|\smallint \limits _{\mathbb {S}^{n-1}}f(2^{j(\delta -\rho )}x-2^{j\delta }y)d\sigma (y)|,\,\,\delta &lt;\rho , \)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <msubsup> <mi>M</mi> <mrow> <mi>D</mi> <mo>,</mo> <mi>δ</mi> <mo>,</mo> <mi>ρ</mi> </mrow> <mrow> <mi>d</mi> <mi>σ</mi> </mrow> </msubsup> <mi>f</mi> <mrow> <mo stretchy="false">(</mo> <mi>x</mi> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <munder> <mo movablelimits="true">sup</mo> <mrow> <mi>j</mi> <mo>∈</mo> <mi mathvariant="double-struck">Z</mi> <mo>:</mo> <mi>j</mi> <mo>&lt;</mo> <mn>0</mn> </mrow> </munder> <mrow> <mo stretchy="false">|</mo> <msub> <mo largeop="false">∫</mo> <msup> <mrow> <mi mathvariant="double-struck">S</mi> </mrow> <mrow> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </msup> </msub> <mi>f</mi> <mrow> <mo stretchy="false">(</mo> <msup> <mn>2</mn> <mrow> <mi>j</mi> <mo stretchy="false">(</mo> <mi>δ</mi> <mo>-</mo> <mi>ρ</mi> <mo stretchy="false">)</mo> </mrow> </msup> <mi>x</mi> <mo>-</mo> <msup> <mn>2</mn> <mrow> <mi>j</mi> <mi>δ</mi> </mrow> </msup> <mi>y</mi> <mo stretchy="false">)</mo> </mrow> <mi>d</mi> <mi>σ</mi> <mrow> <mo stretchy="false">(</mo> <mi>y</mi> <mo stretchy="false">)</mo> </mrow> <mo stretchy="false">|</mo> </mrow> <mo>,</mo> <mspace width="0.166667em" /> <mspace width="0.166667em" /> <mi>δ</mi> <mo>&lt;</mo> <mi>ρ</mi> <mo>,</mo> </mrow> </math></EquationSource> </Equation>where <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10958_2025_7836_Article_IEq4.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\(d\sigma \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>d</mi> <mi>σ</mi> </mrow> </math></EquationSource> </InlineEquation> denotes the normalised surface measure on the sphere <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10958_2025_7836_Article_IEq5.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="76" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathbb {S}^{n-1}\subset \mathbb {R}^n\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msup> <mrow> <mi mathvariant="double-struck">S</mi> </mrow> <mrow> <mi>n</mi> <mo>-</mo> <mn>1</mn> </mrow> </msup> <mo>⊂</mo> <msup> <mrow> <mi mathvariant="double-struck">R</mi> </mrow> <mi>n</mi> </msup> </mrow> </math></EquationSource> </InlineEquation>. We also consider the weighted boundedness for a class of local lacunary maximal functions on homogeneous Lie groups, and we present applications of our results on the Heisenberg group for weighted local lacunary maximal functions defined by spherical averages associated with the Korányi sphere.</p>

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WEIGHTED BOUNDEDNESS FOR A CLASS OF LOCAL LACUNARY MAXIMAL OPERATORS

  • Duván Cardona

摘要

We investigate the weighted boundedness for a class of local lacunary maximal operators on arbitrary homogeneous Lie groups. On \(\mathbb {R}^n,\) R n , we analyse the \(L^p\) L p - \(L^q\) L q -boundedness for a class of local lacunary maximal functions on weighted spaces. Our analysis covers weighted dyadic maximal functions as the following ones: \( M_{D,\alpha }^{d\sigma }f(x)=\sup _{j\in \mathbb {Z}:j<0}|\frac{1}{2^{j\alpha }}\smallint \limits _{\mathbb {S}^{n-1}}f(x-2^{j}y)|x-2^{j}y|^{\alpha }d\sigma (y)|,\,\alpha <0, \) M D , α d σ f ( x ) = sup j Z : j < 0 | 1 2 j α S n - 1 f ( x - 2 j y ) | x - 2 j y | α d σ ( y ) | , α < 0 , and also dyadic maximal operators of the form \( M_{D,\delta ,\rho }^{d\sigma }f(x)=\sup _{j\in \mathbb {Z}:j<0}|\smallint \limits _{\mathbb {S}^{n-1}}f(2^{j(\delta -\rho )}x-2^{j\delta }y)d\sigma (y)|,\,\,\delta <\rho , \) M D , δ , ρ d σ f ( x ) = sup j Z : j < 0 | S n - 1 f ( 2 j ( δ - ρ ) x - 2 j δ y ) d σ ( y ) | , δ < ρ , where \(d\sigma \) d σ denotes the normalised surface measure on the sphere \(\mathbb {S}^{n-1}\subset \mathbb {R}^n\) S n - 1 R n . We also consider the weighted boundedness for a class of local lacunary maximal functions on homogeneous Lie groups, and we present applications of our results on the Heisenberg group for weighted local lacunary maximal functions defined by spherical averages associated with the Korányi sphere.