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arXiv 0902.0575hep-thgr-qc
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扭曲协方差作为完全协变DFR模型的非不变约束

Twisted Covariance as a Non Invariant Restriction of the Fully Covariant DFR Model

Gherardo Piacitelli

摘要:

我们讨论由关系[q_theta^mu,q_theta^nu]=i theta^{mu nu}生成的非对易时空代数上的扭曲协方差,其中矩阵theta被视为固定的(不是张量),并且我们避免使用扭曲的渐近Moyal展开。我们表明,θ的张量性质只隐藏在形式主义中:特别是如果θ满足DFR条件,如果我们同意放弃一个巨大的非不变定域态集,那么平坦量子时空的扭曲洛伦兹协变模型可以等价地用DFR模型来描述;只有最后一步,如果作为基本假设,严重违反了相对性原理。我们还将证明,就量子闵可夫斯基时空上的量子场论的一些流行方法而言,上述相对论破缺和对局域态的特别排斥是一个独立的、不必要的假设。以上所述应该引起一些关注,即在任意选择的特权框架中,任意选择θ可能会产生可观察到的后果。

英文摘要:

We discuss twisted covariance over the noncommutative spacetime algebra generated by the relations [q_theta^mu,q_theta^nu]=i theta^{mu nu}, where the matrix theta is treated as fixed (not a tensor), and we refrain from using the asymptotic Moyal expansion of the twists. We show that the tensor nature of theta is only hidden in the formalism: in particular if theta fulfils the DFR conditions, the twisted Lorentz covariant model of the flat quantum spacetime may be equivalently described in terms of the DFR model, if we agree to discard a huge non invariant set of localisation states; it is only this last step which, if taken as a basic assumption, severely breaks the relativity principle. We also will show that the above mentioned, relativity breaking, ad hoc rejection of localisation states is an independent, unnecessary assumption, as far as some popular approaches to quantum field theory on the quantum Minkowski spacetime are concerned. The above should raise some concerns about speculations on possible observable consequences of arbitrary choices of theta in arbitrarily selected privileged frames.

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