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arXiv 0710.3093hep-th
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具有宇宙学常数的非相对论性时空中的加速度放大对称性

Acceleration-Enlarged Symmetries in Nonrelativistic Space-Time with a Cosmological Constant

J. Lukierski, P. C. Stichel, W. J. Zakrzewski

摘要:

通过考虑deSitter几何的非相对论极限,得到了具有宇宙学常数和Newton-Hooke(NH)对称性的非相对论时空。我们证明了NH对称代数可以通过增加常加速度生成元而扩大,并赋予中心扩张(在任意维(D)上有一个,在D=(2+1)上有三个).我们提出了一个经典的拉格朗日和哈密顿框架下构建模型的准不变扩大NH对称依赖于三个参数描述的三个非零中心荷。然后,哈密顿动力学分裂成外部和内部扇区,具有外部和内部相空间的新的非对易结构。我们证明了在宇宙学常数为零的极限下,系统退化为[1]中提出的具有加速度放大的伽利略对称性的系统。

英文摘要:

By considering the nonrelativistic limit of de-Sitter geometry one obtains the nonrelativistic space-time with a cosmological constant and Newton-Hooke (NH) symmetries. We show that the NH symmetry algebra can be enlarged by the addition of the constant acceleration generators and endowed with central extensions (one in any dimension (D) and three in D=(2+1)). We present a classical Lagrangian and Hamiltonian framework for constructing models quasi-invariant under enlarged NH symmetries which depend on three parameters described by three nonvanishing central charges. The Hamiltonian dynamics then splits into external and internal sectors with new non-commutative structures of external and internal phase spaces. We show that in the limit of vanishing cosmological constant the system reduces to the one presented in [1] which possesses accelaration-enlarged Galilean symmetries.

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