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        "quote": "- 第一个群在 $\\mathbf{C}^2$ 上的表示，最容易看作 $\\mathrm{SU}(2)$ 的[<u class=\"concept-term\" data-concept-reference=\"concepts/representation-theory/defining-representation\" data-concept-identity=\"urn:uuid:6800cca5-05b3-4571-9b98-979ca6c8a5c1\" data-concept-route=\"/concept-identities#concept-6800cca5-05b3-4571-9b98-979ca6c8a5c1\">定义表示(defining representation)</u>](../../../../../concepts/representation-theory/defining-representation)。它不是 $\\mathrm{SO}(3)$ 的表示：从单位元出发，沿不可收缩回路绕行一周后，该回路在 $\\mathrm{SU}(2)$ 中的提升会到达负单位元，而非单位元，因此这种作用不能下降为 $\\mathrm{SO}(3)$ 的表示。这称为“[<u id=\"concept-6-3-spinor-representation\" class=\"concept-term\" data-concept-reference=\"concepts/representation-theory/spinor-representation\" data-concept-id=\"concept-6-3-spinor-representation\" data-concept-identity=\"urn:uuid:8d16bffc-ce2e-49f4-9683-6eabeb80e54b\" data-concept-route=\"/concept-identities#concept-8d16bffc-ce2e-49f4-9683-6eabeb80e54b\">自旋 1/2 表示(spin-1/2 representation)</u>](../../../../../concepts/representation-theory/spinor-representation)”或“[<u class=\"concept-term\" data-concept-reference=\"concepts/representation-theory/spinor-representation\" data-concept-identity=\"urn:uuid:9784dcc7-9e6e-4545-b544-9c8e88f90bf7\" data-concept-route=\"/concept-identities#concept-9784dcc7-9e6e-4545-b544-9c8e88f90bf7\" id=\"first-a5b0282092358cde57b2-zh\">旋量表示(spinor representation)</u>](../../../../../concepts/representation-theory/spinor-representation)”，并将在[第 7 章](../chapter-07/index#section-7)中进一步讨论。",
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        "quote": "## 7.1 [<u class=\"concept-term\" data-concept-reference=\"concepts/representation-theory/spinor-representation\" data-concept-identity=\"urn:uuid:9784dcc7-9e6e-4545-b544-9c8e88f90bf7\" data-concept-route=\"/concept-identities#concept-9784dcc7-9e6e-4545-b544-9c8e88f90bf7\">旋量表示(spinor representation)</u>](../../../../../concepts/representation-theory/spinor-representation)",
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        "quote": "## 7.1 The [<u class=\"concept-term\" data-concept-reference=\"concepts/representation-theory/spinor-representation\" data-concept-identity=\"urn:uuid:9784dcc7-9e6e-4545-b544-9c8e88f90bf7\" data-concept-route=\"/concept-identities#concept-9784dcc7-9e6e-4545-b544-9c8e88f90bf7\">spinor representation</u>](../../../../../concepts/representation-theory/spinor-representation)",
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        "quote": "\n> [!definition] 定义（[<u id=\"concept-7-1-spinor-representation\" class=\"concept-term\" data-concept-reference=\"concepts/representation-theory/spinor-representation\" data-concept-id=\"concept-7-1-spinor-representation\" data-concept-identity=\"urn:uuid:9784dcc7-9e6e-4545-b544-9c8e88f90bf7\" data-concept-route=\"/concept-identities#concept-9784dcc7-9e6e-4545-b544-9c8e88f90bf7\">旋量表示(spinor representation)</u>](../../../../../concepts/representation-theory/spinor-representation)）\n> $\\mathrm{Spin}(3)=\\mathrm{SU}(2)$ 的旋量表示是在 $\\mathbf{C}^2$ 上由下式给出的表示：\n>\n> $$\n> g \\in \\mathrm{SU}(2) \\longmapsto \\pi_{\\mathrm{spinor}}(g)=g\n> $$\n",
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        "quote": "\n> [!definition] Definition ([<u id=\"concept-7-1-spinor-representation\" class=\"concept-term\" data-concept-reference=\"concepts/representation-theory/spinor-representation\" data-concept-id=\"concept-7-1-spinor-representation\" data-concept-identity=\"urn:uuid:9784dcc7-9e6e-4545-b544-9c8e88f90bf7\" data-concept-route=\"/concept-identities#concept-9784dcc7-9e6e-4545-b544-9c8e88f90bf7\">Spinor representation</u>](../../../../../concepts/representation-theory/spinor-representation))\n> The spinor representation of $\\mathrm{Spin}(3)=\\mathrm{SU}(2)$ is the representation on $\\mathbf{C}^2$ given by\n>\n> $$\n> g \\in \\mathrm{SU}(2) \\longmapsto \\pi_{\\mathrm{spinor}}(g)=g\n> $$\n",
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        "quote": "对于自旋为 $1/2$ 的粒子，[<u id=\"concept-7-spin-group\" class=\"concept-term\" data-concept-identity=\"urn:uuid:8adadd91-0a76-4463-a472-62ff66c5bfb3\" data-concept-route=\"/concept-identities#concept-8adadd91-0a76-4463-a472-62ff66c5bfb3\">自旋群(spin group)</u> Spin(3)](../../../../../concepts/group-theory/spin-group)与 $SU(2)$ 同构，并通过[<u id=\"concept-7-spinor-representation\" class=\"concept-term\" data-concept-identity=\"urn:uuid:9784dcc7-9e6e-4545-b544-9c8e88f90bf7\" data-concept-route=\"/concept-identities#concept-9784dcc7-9e6e-4545-b544-9c8e88f90bf7\">旋量表示(spinor representation)</u>](../../../../../concepts/representation-theory/spinor-representation)作用于量子态，其中元素 $\\Omega ( \\theta , \\mathbf { w } ) \\in S U ( 2 )$ 的作用为",
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        "quote": "For a spin-$1/2$ particle, the [<u class=\"concept-term\" data-concept-identity=\"urn:uuid:8adadd91-0a76-4463-a472-62ff66c5bfb3\" data-concept-route=\"/concept-identities#concept-8adadd91-0a76-4463-a472-62ff66c5bfb3\">Spin group</u> (Spin(3))](../../../../../concepts/group-theory/spin-group) group, which is isomorphic to $SU(2)$, acts on states through the [<u class=\"concept-term\" data-concept-identity=\"urn:uuid:9784dcc7-9e6e-4545-b544-9c8e88f90bf7\" data-concept-route=\"/concept-identities#concept-9784dcc7-9e6e-4545-b544-9c8e88f90bf7\">spinor representation</u>](../../../../../concepts/representation-theory/spinor-representation) with the element $\\Omega ( \\theta , \\mathbf { w } ) \\in S U ( 2 )$ acting as",
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        "quote": "对具有 $d$ 个自由度的费米子振子，算符代数是 $\\operatorname{Cliff}(2d,\\mathbb C)$，由 $a_{Fj},a_{Fj}^\\dagger$ 生成。这些算符作用于 $2^d$ 维复向量空间 $\\mathcal H_F=\\mathcal F_d^+$，对应于玻色子情形中作用于 $\\mathcal F_d$ 的 $\\Gamma_{BF}^\\prime$。自旋群由Clifford代数中的可逆元素组成，因此在 $\\mathcal F_d^+$ 上有一个表示，称为“[<u class=\"concept-term\" data-concept-reference=\"concepts/representation-theory/spinor-representation\" data-concept-identity=\"urn:uuid:9784dcc7-9e6e-4545-b544-9c8e88f90bf7\" data-concept-route=\"/concept-identities#concept-9784dcc7-9e6e-4545-b544-9c8e88f90bf7\">旋量表示(spinor representation)</u>](../../../../../concepts/representation-theory/spinor-representation)”。它可仿照玻色子情形的元辛表示来构造。本章还研究Schrödinger表示的费米子类似物；它在酉性上有问题，却可用于描述物理学中的“鬼”自由度。",
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        "quote": "$\\gamma_j$ 的二次组合给出 $\\mathfrak{so}(2d)=\\mathfrak{spin}(2d)$ 的表示。指数化后，得到 $SO(2d)$ 的至多相差一个符号的表示，以及其二重覆盖 $\\operatorname{Spin}(2d)$ 的真正表示。这个在 $\\mathcal F_d^+$ 上构造的表示称为[<u class=\"concept-term\" data-concept-reference=\"concepts/representation-theory/spinor-representation\" data-concept-identity=\"urn:uuid:9784dcc7-9e6e-4545-b544-9c8e88f90bf7\" data-concept-route=\"/concept-identities#concept-9784dcc7-9e6e-4545-b544-9c8e88f90bf7\">旋量表示(spinor representation)</u>](../../../../../concepts/representation-theory/spinor-representation)；有时把带此群作用的空间记为 $S$。",
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