<p>In this paper, we show the existence of a near-group category of type <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\mathbb {Z} / 4\mathbb {Z} \times \mathbb {Z} / 4\mathbb {Z}+16\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="double-struck">Z</mi> <mo stretchy="false">/</mo> <mn>4</mn> <mi mathvariant="double-struck">Z</mi> <mo>×</mo> <mi mathvariant="double-struck">Z</mi> <mo stretchy="false">/</mo> <mn>4</mn> <mi mathvariant="double-struck">Z</mi> <mo>+</mo> <mn>16</mn> </mrow> </math></EquationSource> </InlineEquation> and compute the modular data of its Drinfeld center. We prove that a modular data of rank 10 can be obtained through a condensation of the Drinfeld center of the near-group category <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\mathbb {Z} / 4\mathbb {Z} \times \mathbb {Z} / 4\mathbb {Z}+16\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="double-struck">Z</mi> <mo stretchy="false">/</mo> <mn>4</mn> <mi mathvariant="double-struck">Z</mi> <mo>×</mo> <mi mathvariant="double-struck">Z</mi> <mo stretchy="false">/</mo> <mn>4</mn> <mi mathvariant="double-struck">Z</mi> <mo>+</mo> <mn>16</mn> </mrow> </math></EquationSource> </InlineEquation>, and that it can also be realized as the Drinfeld center of a fusion category of rank 4. Moreover, we compute the modular data for the Drinfeld center of a near-group category <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\mathbb {Z} / 8\mathbb {Z}+8\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="double-struck">Z</mi> <mo stretchy="false">/</mo> <mn>8</mn> <mi mathvariant="double-struck">Z</mi> <mo>+</mo> <mn>8</mn> </mrow> </math></EquationSource> </InlineEquation> and show that, up to Galois conjugation, the non-pointed factor of its condensation has the same modular data as the quantum group category <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\mathcal {C}(\mathfrak {g}_2, 4)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="script">C</mi> <mo stretchy="false">(</mo> <msub> <mi mathvariant="fraktur">g</mi> <mn>2</mn> </msub> <mo>,</mo> <mn>4</mn> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>.</p>

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Realizing Modular Data from Centers of Near-group Categories

  • Zhiqiang Yu,
  • Qing Zhang

摘要

In this paper, we show the existence of a near-group category of type \(\mathbb {Z} / 4\mathbb {Z} \times \mathbb {Z} / 4\mathbb {Z}+16\) Z / 4 Z × Z / 4 Z + 16 and compute the modular data of its Drinfeld center. We prove that a modular data of rank 10 can be obtained through a condensation of the Drinfeld center of the near-group category \(\mathbb {Z} / 4\mathbb {Z} \times \mathbb {Z} / 4\mathbb {Z}+16\) Z / 4 Z × Z / 4 Z + 16 , and that it can also be realized as the Drinfeld center of a fusion category of rank 4. Moreover, we compute the modular data for the Drinfeld center of a near-group category \(\mathbb {Z} / 8\mathbb {Z}+8\) Z / 8 Z + 8 and show that, up to Galois conjugation, the non-pointed factor of its condensation has the same modular data as the quantum group category \(\mathcal {C}(\mathfrak {g}_2, 4)\) C ( g 2 , 4 ) .