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arXiv 1004.3450hep-thgr-qcmath-phmath.MP
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圈量子引力的非对易通量表示

Non-commutative flux representation for loop quantum gravity

Aristide Baratin, Bianca Dittrich, Daniele Oriti, Johannes Tambornino

摘要:

圈量子引力的希尔伯特空间通常用规范联络的圆柱泛函来描述,其中电通量充当非对易导子。长期以来,人们认为这种非对易性阻止了圈量子引力的对偶通量(或三元组)表示的存在。相反,我们在这里表明,这样的表示可以明确地定义,通过一个非交换的傅立叶变换定义的环重力状态空间。在这种对偶表示中,通量算子通过 *-乘法起作用,而完整性算子通过平移起作用。我们描述了规范不变对偶态,并讨论了它们的几何意义。最后,我们将这种构造应用于U(1)规范群的简单情况,并将由此得到的通量表示与圈量子宇宙学中使用的三元组表示进行比较。

英文摘要:

The Hilbert space of loop quantum gravity is usually described in terms of cylindrical functionals of the gauge connection, the electric fluxes acting as non-commuting derivation operators. It has long been believed that this non-commutativity prevents a dual flux (or triad) representation of loop quantum gravity to exist. We show here, instead, that such a representation can be explicitly defined, by means of a non-commutative Fourier transform defined on the loop gravity state space. In this dual representation, flux operators act by *-multiplication and holonomy operators act by translation. We describe the gauge invariant dual states and discuss their geometrical meaning. Finally, we apply the construction to the simpler case of a U(1) gauge group and compare the resulting flux representation with the triad representation used in loop quantum cosmology.

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