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arXiv 1503.08633hep-thmath-phmath.MP
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关于l-共形Galilei代数和Newton-Hooke代数的动力学实现

On dynamical realizations of l-conformal Galilei and Newton-Hooke algebras

Anton Galajinsky, Ivan Masterov

摘要:

在最近的两篇论文[N。Aizawa,Y. Kimura,J. Segar,J.Phys.A46(2013)405204]和[N. Aizawa,Z. Kuznetsova,F. Toppan,J.Math.Phys.56(2015)031701],应用了具有半整数l的中心扩展l-共形Galilei代数的表示理论,以便构造将对应群表现为运动对称的二阶微分方程。有人建议将它们视为薛定谔方程,其中包含描述没有高阶导数的动力系统的哈密顿量。然而,汉密尔顿有两个不寻常的特征。首先,它们只涉及一个自由度的标准动力学项,而其余的变量提供线性动量的贡献。这是典型的Ostrogradsky的规范方法来描述更高的衍生系统。第二,第二篇论文中的哈密顿量不是传统意义上的厄米算符。本文研究了量子哈密顿量的经典极限,证明了量子哈密顿量与描述自由高阶导数非相对论粒子的哈密顿量等价,而量子哈密顿量与频率构成等差数列Ω_k=(2k-1),k=1,.的Pais-Uhlenbeck振子有关,n.我们还用我们最近的工作[A.加拉金斯基岛Masterov,Nucl.Phys.B866(2013)212],其针对l=3/2进行了详细讨论。

英文摘要:

In two recent papers [N. Aizawa, Y. Kimura, J. Segar, J. Phys. A 46 (2013) 405204] and [N. Aizawa, Z. Kuznetsova, F. Toppan, J. Math. Phys. 56 (2015) 031701], representation theory of the centrally extended l-conformal Galilei algebra with half-integer l has been applied so as to construct second order differential equations exhibiting the corresponding group as kinematical symmetry. It was suggested to treat them as the Schrodinger equations which involve Hamiltonians describing dynamical systems without higher derivatives. The Hamiltonians possess two unusual features, however. First, they involve the standard kinetic term only for one degree of freedom, while the remaining variables provide contributions linear in momenta. This is typical for Ostrogradsky's canonical approach to the description of higher derivative systems. Second, the Hamiltonian in the second paper is not Hermitian in the conventional sense. In this work, we study the classical limit of the quantum Hamiltonians and demonstrate that the first of them is equivalent to the Hamiltonian describing free higher derivative nonrelativistic particles, while the second can be linked to the Pais-Uhlenbeck oscillator whose frequencies form the arithmetic sequence omega_k=(2k-1), k=1,...,n. We also confront the higher derivative models with a genuine second order system constructed in our recent work [A. Galajinsky, I. Masterov, Nucl. Phys. B 866 (2013) 212] which is discussed in detail for l=3/2.

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