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arXiv 1709.02090nucl-th
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大振幅集体运动绝热膨胀中$a^\dagger a$项与高阶项的关系

Relation of $a^\dagger a$ terms to higher-order terms in the adiabatic expansion for large-amplitude collective motion

Koichi Sato

摘要:

研究了集体算符中的$a^\dagger a$项与绝热自洽集体坐标(ASCC)方法中的高阶项之间的关系。在ASCC方法中,状态矢量被写为$e^{i\hat G(q,p,n)}|ϕ(q)\rangle$,其中$\hat G(q,p,n)$是集体坐标$q$、其共轭动量$p$和粒子数$n$的函数。根据广义无偏定理,$\hat G$可以写成两个准粒子产生和湮灭算符$a^\dagger_μa^\dagger_ν$和$a_νa_μ$的线性组合。证明了如果$\hat G(q,p,n)$中包含$a^\dagger a$项,则它对应于$\hat G$绝热膨胀中的高阶项.这个关系式可以作为一个处方,一旦给出它而不求解高阶运动方程,就可以从集体算符的$a^\dagger a$部分确定高阶集体算符。

英文摘要:

We investigate the relation of $a^\dagger a$ terms in the collective operator to the higher-order terms in the adiabatic self-consistent collective coordinate (ASCC) method. In the ASCC method, a state vector is written as $e^{i\hat G(q,p,n)}|ϕ(q)\rangle$ with $\hat G(q,p,n)$ which is a function of collective coordinate $q$, its conjugate momentum $p$ and the particle number $n$. According to the generalized Thouless theorem, $\hat G$ can be written as a linear combination of two-quasiparticle creation and annihilation operators $a^\dagger_μa^\dagger_ν$ and $a_νa_μ$. We show that, if $a^\dagger a$ terms are included in $\hat G(q,p,n)$, it corresponds to the higher-order terms in the adiabatic expansion of $\hat G$. This relation serves as a prescription to determine the higher-order collective operators from the $a^\dagger a$ part of the collective operator, once it is given without solving the higher-order equations of motion.

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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