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Equation 8 · A Reference Frame Becomes Classical by Publishing Its Orientation

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GG

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a compact group. Read the equation part by part below; each part has a contextual explanation and a link to its mathematical background.

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GG

Symbol G

a compact group.

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Let G be a compact group. For a full spatial orientation one may choose SO(3) ; for a single direction carried by a spin-coherent state the parameter space is the sphere S2S^2 , equivalently the quotient SO(3)/SO(2) . That distinction is not cosmetic. A spin pointing along n\mathbf n does not encode rotation about n\mathbf n , so it cannot specify a full triad.

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