<p>Let <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11139_2025_1105_Article_IEq1.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="91" /> </InlineMediaObject> <EquationSource Format="TEX">\(\{u_j:j\ge 1\}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">{</mo> <msub> <mi>u</mi> <mi>j</mi> </msub> <mo>:</mo> <mi>j</mi> <mo>≥</mo> <mn>1</mn> <mo stretchy="false">}</mo> </mrow> </math></EquationSource> </InlineEquation> be an orthonormal basis of Hecke-Maass cusp forms for <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11139_2025_1105_Article_IEq2.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="54" /> </InlineMediaObject> <EquationSource Format="TEX">\(SL_2(\mathbb {Z})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>S</mi> <msub> <mi>L</mi> <mn>2</mn> </msub> <mrow> <mo stretchy="false">(</mo> <mi mathvariant="double-struck">Z</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> with Laplace eigenvalue <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11139_2025_1105_Article_IEq3.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="42" /> </InlineMediaObject> <EquationSource Format="TEX">\(\frac{1}{4}+t_{j}^{2}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mfrac> <mn>1</mn> <mn>4</mn> </mfrac> <mo>+</mo> <msubsup> <mi>t</mi> <mrow> <mi>j</mi> </mrow> <mn>2</mn> </msubsup> </mrow> </math></EquationSource> </InlineEquation>. For each <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11139_2025_1105_Article_IEq4.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="18" /> </InlineMediaObject> <EquationSource Format="TEX">\(u_j\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>u</mi> <mi>j</mi> </msub> </math></EquationSource> </InlineEquation>, we have the automorphic symmetric square <i>L</i>-function <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11139_2025_1105_Article_IEq5.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="103" /> </InlineMediaObject> <EquationSource Format="TEX">\(L\left( s,\text{ sym}^{2} u_j\right) \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>L</mi> <mfenced close=")" open="("> <mi>s</mi> <mo>,</mo> <mspace width="0.333333em" /> <msup> <mtext>sym</mtext> <mn>2</mn> </msup> <msub> <mi>u</mi> <mi>j</mi> </msub> </mfenced> </mrow> </math></EquationSource> </InlineEquation>. In this paper, we establish a sharp bound for the third moment of the central values <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11139_2025_1105_Article_IEq6.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="103" /> </InlineMediaObject> <EquationSource Format="TEX">\(L\left( \frac{1}{2},\text{ sym}^{2} u_j\right) \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>L</mi> <mfenced close=")" open="("> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <mo>,</mo> <mspace width="0.333333em" /> <msup> <mtext>sym</mtext> <mn>2</mn> </msup> <msub> <mi>u</mi> <mi>j</mi> </msub> </mfenced> </mrow> </math></EquationSource> </InlineEquation> in short intervals. Specifically, we show that the estimate <Equation ID="Equ51"> <MediaObject> <ImageObject Color="BlackWhite" FileRef="11139_2025_1105_Article_Equ51.gif" Format="GIF" Height="56" Rendition="HTML" Resolution="72" Type="Linedraw" Width="247" /> </MediaObject> <EquationSource Format="TEX">\(\begin{aligned} \sum _{|t_j-T|\le \Delta }L\left( \frac{1}{2},\operatorname {sym}^2u_j\right) ^3\ll T^{1+\epsilon }\Delta \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <munder> <mo>∑</mo> <mrow> <mrow> <mo stretchy="false">|</mo> </mrow> <msub> <mi>t</mi> <mi>j</mi> </msub> <mrow> <mo>-</mo> <mi>T</mi> <mo stretchy="false">|</mo> <mo>≤</mo> <mi mathvariant="normal">Δ</mi> </mrow> </mrow> </munder> <mi>L</mi> <msup> <mfenced close=")" open="("> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <mo>,</mo> <msup> <mo>sym</mo> <mn>2</mn> </msup> <msub> <mi>u</mi> <mi>j</mi> </msub> </mfenced> <mn>3</mn> </msup> <mo>≪</mo> <msup> <mi>T</mi> <mrow> <mn>1</mn> <mo>+</mo> <mi>ϵ</mi> </mrow> </msup> <mi mathvariant="normal">Δ</mi> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>holds for <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11139_2025_1105_Article_IEq7.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="133" /> </InlineMediaObject> <EquationSource Format="TEX">\(T^{\frac{18}{19}+\epsilon }\le \Delta \le T^{1-\epsilon }\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msup> <mi>T</mi> <mrow> <mfrac> <mn>18</mn> <mn>19</mn> </mfrac> <mo>+</mo> <mi>ϵ</mi> </mrow> </msup> <mo>≤</mo> <mi mathvariant="normal">Δ</mi> <mo>≤</mo> <msup> <mi>T</mi> <mrow> <mn>1</mn> <mo>-</mo> <mi>ϵ</mi> </mrow> </msup> </mrow> </math></EquationSource> </InlineEquation>.</p>

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The third moment of symmetric square L-functions at the central point

  • Liangxun Li

摘要

Let \(\{u_j:j\ge 1\}\) { u j : j 1 } be an orthonormal basis of Hecke-Maass cusp forms for \(SL_2(\mathbb {Z})\) S L 2 ( Z ) with Laplace eigenvalue \(\frac{1}{4}+t_{j}^{2}\) 1 4 + t j 2 . For each \(u_j\) u j , we have the automorphic symmetric square L-function \(L\left( s,\text{ sym}^{2} u_j\right) \) L s , sym 2 u j . In this paper, we establish a sharp bound for the third moment of the central values \(L\left( \frac{1}{2},\text{ sym}^{2} u_j\right) \) L 1 2 , sym 2 u j in short intervals. Specifically, we show that the estimate \(\begin{aligned} \sum _{|t_j-T|\le \Delta }L\left( \frac{1}{2},\operatorname {sym}^2u_j\right) ^3\ll T^{1+\epsilon }\Delta \end{aligned}\) | t j - T | Δ L 1 2 , sym 2 u j 3 T 1 + ϵ Δ holds for \(T^{\frac{18}{19}+\epsilon }\le \Delta \le T^{1-\epsilon }\) T 18 19 + ϵ Δ T 1 - ϵ .