Angular variables - conversion

Japanese: 角変数 - かくへんすう
Angular variables - conversion

…For example, if one degree of freedom is separated from the others in the Hamiltonian function by a suitable canonical transformation, the corresponding action integral S is expressed as the sum of the action integral S 1 for the separated degree of freedom and the action integral S ′ for the remaining degrees of freedom, i.e., S = S 1 + S ′. Furthermore, if a closed orbit is obtained for this degree of freedom, a set of solutions can be found with its action variable J 1 and the corresponding conjugate variable w 1 (called the angular variable with respect to the action variable). An interesting question related to the classical quantum conditions mentioned above is how the action quantity is defined in quantum mechanics and what role it plays. …

*Some of the terminology explanations that mention "angular variables" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…例えば適当な正準変換により,一つの自由度が他自由度からハミルトン関数において分離される場合,これに対応して作用積分Sは分離された自由度に関する作用積分S1と,残りの自由度に関する作用積分S′との和,すなわちSS1S′のように表されることになる。さらにこの自由度に関し閉軌道が得られれば,その作用変数J1と対応する共役変数w1(作用変数に対して角変数という)とで1組の解が求められる。 前述の古典量子条件に関連して興味ある問題に,量子力学では作用量がどのように定義され,またどのような役割を果たすかということがある。…

※「角変数」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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