<p>Let <i>V</i> be a strongly rational vertex operator algebra, and let <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq1.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="61" /> </InlineMediaObject> <EquationSource Format="TEX">\(g_1, g_2, g_3\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>g</mi> <mn>1</mn> </msub> <mo>,</mo> <msub> <mi>g</mi> <mn>2</mn> </msub> <mo>,</mo> <msub> <mi>g</mi> <mn>3</mn> </msub> </mrow> </math></EquationSource> </InlineEquation> be three commuting finitely ordered automorphisms of <i>V</i> such that <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq2.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="67" /> </InlineMediaObject> <EquationSource Format="TEX">\(g_1g_2=g_3\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>g</mi> <mn>1</mn> </msub> <msub> <mi>g</mi> <mn>2</mn> </msub> <mo>=</mo> <msub> <mi>g</mi> <mn>3</mn> </msub> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq3.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="50" /> </InlineMediaObject> <EquationSource Format="TEX">\(g_i^T=1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msubsup> <mi>g</mi> <mi>i</mi> <mi>T</mi> </msubsup> <mo>=</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation> for <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq4.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="68" /> </InlineMediaObject> <EquationSource Format="TEX">\(i=1, 2, 3\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mn>2</mn> <mo>,</mo> <mn>3</mn> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq5.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="47" /> </InlineMediaObject> <EquationSource Format="TEX">\(T\in \mathbb {N}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>T</mi> <mo>∈</mo> <mi mathvariant="double-struck">N</mi> </mrow> </math></EquationSource> </InlineEquation>. Suppose <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq6.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="26" /> </InlineMediaObject> <EquationSource Format="TEX">\(M^1\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>M</mi> <mn>1</mn> </msup> </math></EquationSource> </InlineEquation> is a <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq7.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\(g_1\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>g</mi> <mn>1</mn> </msub> </math></EquationSource> </InlineEquation>-twisted module. For any <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq8.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="78" /> </InlineMediaObject> <EquationSource Format="TEX">\(n, m\in \frac{1}{T}\mathbb {N}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>n</mi> <mo>,</mo> <mi>m</mi> <mo>∈</mo> <mfrac> <mn>1</mn> <mi>T</mi> </mfrac> <mi mathvariant="double-struck">N</mi> </mrow> </math></EquationSource> </InlineEquation>, we construct an <InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq9.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="62" /> </InlineMediaObject> <EquationSource Format="TEX">\(A_{g_3, n}(V)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>A</mi> <mrow> <msub> <mi>g</mi> <mn>3</mn> </msub> <mo>,</mo> <mi>n</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <mi>V</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>-<InlineEquation ID="IEq10"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq10.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="65" /> </InlineMediaObject> <EquationSource Format="TEX">\(A_{g_2, m}(V)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>A</mi> <mrow> <msub> <mi>g</mi> <mn>2</mn> </msub> <mo>,</mo> <mi>m</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <mi>V</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>-bimodule <InlineEquation ID="IEq11"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq11.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="102" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {A}_{g_3, g_2, n, m}(M^1)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi mathvariant="script">A</mi> <mrow> <msub> <mi>g</mi> <mn>3</mn> </msub> <mo>,</mo> <msub> <mi>g</mi> <mn>2</mn> </msub> <mo>,</mo> <mi>n</mi> <mo>,</mo> <mi>m</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <msup> <mi>M</mi> <mn>1</mn> </msup> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> associated to the quadruple <InlineEquation ID="IEq12"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq12.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="104" /> </InlineMediaObject> <EquationSource Format="TEX">\((M^1, g_1, g_2, g_3)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <msup> <mi>M</mi> <mn>1</mn> </msup> <mo>,</mo> <msub> <mi>g</mi> <mn>1</mn> </msub> <mo>,</mo> <msub> <mi>g</mi> <mn>2</mn> </msub> <mo>,</mo> <msub> <mi>g</mi> <mn>3</mn> </msub> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>. Given an <InlineEquation ID="IEq13"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq10.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="65" /> </InlineMediaObject> <EquationSource Format="TEX">\(A_{g_2, m}(V)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>A</mi> <mrow> <msub> <mi>g</mi> <mn>2</mn> </msub> <mo>,</mo> <mi>m</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <mi>V</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>-module <i>U</i>, an admissible <InlineEquation ID="IEq14"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq14.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\(g_3\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>g</mi> <mn>3</mn> </msub> </math></EquationSource> </InlineEquation>-twisted module <InlineEquation ID="IEq15"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq15.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="80" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {M}(M^1, U)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="script">M</mi> <mo stretchy="false">(</mo> <msup> <mi>M</mi> <mn>1</mn> </msup> <mo>,</mo> <mi>U</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> is constructed. For the quadruple (<i>V</i>,&#xa0;1,&#xa0;<i>g</i>,&#xa0;<i>g</i>) with some finitely ordered <InlineEquation ID="IEq16"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq16.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="86" /> </InlineMediaObject> <EquationSource Format="TEX">\(g\in \text {Aut}(V)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>g</mi> <mo>∈</mo> <mtext>Aut</mtext> <mo stretchy="false">(</mo> <mi>V</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq17"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq17.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="81" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {A}_{g, g, n, m}(V)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi mathvariant="script">A</mi> <mrow> <mi>g</mi> <mo>,</mo> <mi>g</mi> <mo>,</mo> <mi>n</mi> <mo>,</mo> <mi>m</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <mi>V</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> coincides with the <InlineEquation ID="IEq18"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq18.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="57" /> </InlineMediaObject> <EquationSource Format="TEX">\(A_{g, n}(V)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>A</mi> <mrow> <mi>g</mi> <mo>,</mo> <mi>n</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <mi>V</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>-<InlineEquation ID="IEq19"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq19.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="60" /> </InlineMediaObject> <EquationSource Format="TEX">\(A_{g, m}(V)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>A</mi> <mrow> <mi>g</mi> <mo>,</mo> <mi>m</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <mi>V</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>-bimodules <InlineEquation ID="IEq20"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq20.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="70" /> </InlineMediaObject> <EquationSource Format="TEX">\(A_{g, n, m}(V)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi>A</mi> <mrow> <mi>g</mi> <mo>,</mo> <mi>n</mi> <mo>,</mo> <mi>m</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <mi>V</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> constructed by Dong and Jiang, and <InlineEquation ID="IEq21"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq21.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="66" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {M}(V, U)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="script">M</mi> <mo stretchy="false">(</mo> <mi>V</mi> <mo>,</mo> <mi>U</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> is the generalized Verma type admissible <i>g</i>-twisted module generated by <i>U</i>. When <InlineEquation ID="IEq22"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq22.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="88" /> </InlineMediaObject> <EquationSource Format="TEX">\(U=M^2(m)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>U</mi> <mo>=</mo> <msup> <mi>M</mi> <mn>2</mn> </msup> <mrow> <mo stretchy="false">(</mo> <mi>m</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> is the <i>m</i>-th component of a <InlineEquation ID="IEq23"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq23.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\(g_2\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>g</mi> <mn>2</mn> </msub> </math></EquationSource> </InlineEquation>-twisted module <InlineEquation ID="IEq24"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq24.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="26" /> </InlineMediaObject> <EquationSource Format="TEX">\(M^2\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>M</mi> <mn>2</mn> </msup> </math></EquationSource> </InlineEquation> for some <InlineEquation ID="IEq25"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq25.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="60" /> </InlineMediaObject> <EquationSource Format="TEX">\(m\in \frac{1}{T}\mathbb {N}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>m</mi> <mo>∈</mo> <mfrac> <mn>1</mn> <mi>T</mi> </mfrac> <mi mathvariant="double-struck">N</mi> </mrow> </math></EquationSource> </InlineEquation>, we show that the submodule of <InlineEquation ID="IEq26"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq26.gif" Format="GIF" Height="20" Rendition="HTML" Resolution="72" Type="Linedraw" Width="118" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {M}(M^1, M^2(m))\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="script">M</mi> <mo stretchy="false">(</mo> <msup> <mi>M</mi> <mn>1</mn> </msup> <mo>,</mo> <msup> <mi>M</mi> <mn>2</mn> </msup> <mrow> <mo stretchy="false">(</mo> <mi>m</mi> <mo stretchy="false">)</mo> </mrow> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> generated by the <i>m</i>-th component satisfies the universal property of the tensor product of <InlineEquation ID="IEq27"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq6.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="26" /> </InlineMediaObject> <EquationSource Format="TEX">\(M^1\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>M</mi> <mn>1</mn> </msup> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq28"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="209_2025_3804_Article_IEq24.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="26" /> </InlineMediaObject> <EquationSource Format="TEX">\(M^2\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>M</mi> <mn>2</mn> </msup> </math></EquationSource> </InlineEquation>. Using this result, we obtain a twisted version of Frenkel-Zhu-Li’s fusion rules theorem.</p>

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Bimodules over twisted Zhu algebras and twisted fusion rules theorem for vertex operator algebras

  • Yiyi Zhu

摘要

Let V be a strongly rational vertex operator algebra, and let \(g_1, g_2, g_3\) g 1 , g 2 , g 3 be three commuting finitely ordered automorphisms of V such that \(g_1g_2=g_3\) g 1 g 2 = g 3 and \(g_i^T=1\) g i T = 1 for \(i=1, 2, 3\) i = 1 , 2 , 3 and \(T\in \mathbb {N}\) T N . Suppose \(M^1\) M 1 is a \(g_1\) g 1 -twisted module. For any \(n, m\in \frac{1}{T}\mathbb {N}\) n , m 1 T N , we construct an \(A_{g_3, n}(V)\) A g 3 , n ( V ) - \(A_{g_2, m}(V)\) A g 2 , m ( V ) -bimodule \(\mathcal {A}_{g_3, g_2, n, m}(M^1)\) A g 3 , g 2 , n , m ( M 1 ) associated to the quadruple \((M^1, g_1, g_2, g_3)\) ( M 1 , g 1 , g 2 , g 3 ) . Given an \(A_{g_2, m}(V)\) A g 2 , m ( V ) -module U, an admissible \(g_3\) g 3 -twisted module \(\mathcal {M}(M^1, U)\) M ( M 1 , U ) is constructed. For the quadruple (V, 1, gg) with some finitely ordered \(g\in \text {Aut}(V)\) g Aut ( V ) , \(\mathcal {A}_{g, g, n, m}(V)\) A g , g , n , m ( V ) coincides with the \(A_{g, n}(V)\) A g , n ( V ) - \(A_{g, m}(V)\) A g , m ( V ) -bimodules \(A_{g, n, m}(V)\) A g , n , m ( V ) constructed by Dong and Jiang, and \(\mathcal {M}(V, U)\) M ( V , U ) is the generalized Verma type admissible g-twisted module generated by U. When \(U=M^2(m)\) U = M 2 ( m ) is the m-th component of a \(g_2\) g 2 -twisted module \(M^2\) M 2 for some \(m\in \frac{1}{T}\mathbb {N}\) m 1 T N , we show that the submodule of \(\mathcal {M}(M^1, M^2(m))\) M ( M 1 , M 2 ( m ) ) generated by the m-th component satisfies the universal property of the tensor product of \(M^1\) M 1 and \(M^2\) M 2 . Using this result, we obtain a twisted version of Frenkel-Zhu-Li’s fusion rules theorem.