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arXiv 1007.2399nucl-th
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Dirac哈密顿量的相对论U(3)对称性和伪U(3)对称性

Relativistic U(3) Symmetry and Pseudo-U(3) Symmetry of the Dirac Hamiltonian

Joseph N Ginocchio

摘要:

本文在两种极限下解析求解了具有相对论性标量和矢量谐振子势的狄拉克哈密顿量。一个是自旋极限,其中自旋是狄拉克哈密顿量的不变对称,另一个是伪自旋极限,其中伪自旋是狄拉克哈密顿量的不变对称。自旋极限发生在标量势等于矢量势加上一个常数时,而赝自旋极限发生在标量势大小相等但符号与矢量势加上一个常数相反时。像非相对论性谐振子一样,这些极限都有更高的对称性。例如,对于球对称振子,这些极限分别具有U(3)和伪U(3)对称性。我们将讨论这两个极限的本征函数和本征值,并导出U(3)和伪U(3)对称的相对论生成元。我们还论证了,如果反核子可以束缚在核中,则谱将具有近似的自旋和U(3)对称性。

英文摘要:

The Dirac Hamiltonian with relativistic scalar and vector harmonic oscillator potentials has been solved analytically in two limits. One is the spin limit for which spin is an invariant symmetry of the the Dirac Hamiltonian and the other is the pseudo-spin limit for which pseudo-spin is an invariant symmetry of the the Dirac Hamiltonian. The spin limit occurs when the scalar potential is equal to the vector potential plus a constant, and the pseudospin limit occurs when the scalar potential is equal in magnitude but opposite in sign to the vector potential plus a constant. Like the non-relativistic harmonic oscillator, each of these limits has a higher symmetry. For example, for the spherically symmetric oscillator, these limits have a U(3) and pseudo-U(3) symmetry respectively. We shall discuss the eigenfunctions and eigenvalues of these two limits and derive the relativistic generators for the U(3) and pseudo-U(3) symmetry. We also argue, that, if an anti-nucleon can be bound in a nucleus, the spectrum will have approximate spin and U(3) symmetry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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