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arXiv 1009.0441quant-phhep-phhep-th
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自动厄米性

Automatic Hermiticity

Keiichi Nagao, Holger Bech Nielsen

摘要:

我们研究一个可对角化的哈密顿量,首先不是厄米。测量不能使一个哈密顿本征态变为另一个具有不同本征值的本征态,这就要求必须定义一个内积,使哈密顿量相对于它正规化。在这个子空间上,哈密顿量的反厄米部分的影响被抑制,并且哈密顿量变成厄米。因此厄米性自动出现,我们没有理由坚持认为在基本能级上哈密顿量应该是厄米的。如果哈密顿量以局部形式给出,则可以用两种波函数构造守恒几率流密度。我们还指出了一个可能的错误估计的过去的状态外推回的时间与厄米哈密顿。这是一种表面上的过去状态,而不是一种真实的状态。

英文摘要:

We study a diagonalizable Hamiltonian that is not at first hermitian. Requirement that a measurement shall not change one Hamiltonian eigenstate into another one with a different eigenvalue imposes that an inner product must be defined so as to make the Hamiltonian normal with regard to it. After a long time development with the non-hermitian Hamiltonian, only a subspace of possible states will effectively survive. On this subspace the effect of the anti-hermitian part of the Hamiltonian is suppressed, and the Hamiltonian becomes hermitian. Thus hermiticity emerges automatically, and we have no reason to maintain that at the fundamental level the Hamiltonian should be hermitian. If the Hamiltonian is given in a local form, a conserved probability current density can be constructed with two kinds of wave functions. We also point out a possible misestimation of a past state by extrapolating back in time with the hermitian Hamiltonian. It is a seeming past state, not a true one.

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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